HP ProOne 400 G6 All-in-One PC Review 2025: Better than New?
An all-in-one PC that combines performance with durability is hard to find – so we take a look at the HP ProOne 400 G6 to see if it lives up to expectations.
With a 19.5-inch FHD (1920 x 1080) display and 10th Gen Intel Core processors, this all-in-one PC is designed to handle everyday office tasks without a hitch. We were actually impressed by its flexibility when it comes to memory – with support for up to 64GB of DDR4 memory and storage options from 256GB to 2TB. Additionally, MIL-STD 810H testing gives an indication of its durability, which is important for long-term use in corporate environments.
HP hasn't just focused on performance, though. Security features like HP Sure Sense and HP Sure Click protect against advanced malware, while the use of ocean-sourced plastic in the speaker enclosure demonstrates a commitment to the environment.
What is the HP ProOne 400 G6 All-in-One PC and who is it for?
The HP ProOne 400 G6 is a sophisticated all-in-one PC that blends power and elegance into a single compact chassis. After working with this computer, I can now explain exactly what makes it special and which users will benefit most from it.
Designed for office and front desk environments
The HP ProOne 400 G6 All-in-One PC exudes professionalism with its sleek and functional design. Its modern and sleek design makes it perfect for reception desks and customer service areas where aesthetics are as important as function. Its clean lines also make it a great fit in tight work environments where space is at a premium.
An impressive fact is that this computer has undergone MIL-STD 810H durability testing, ensuring it can withstand daily use in demanding office environments. Despite these rigorous tests, HP has managed to maintain a sophisticated design that fits just as well in a business executive's office as it does at a reception desk.
The 19.5-inch or 23.8-inch (depending on model) display has an anti-glare surface that reduces eye strain during long workdays. This is especially valuable in open-plan offices where lighting conditions can vary.
All-in-one form factor: Advantages and limitations
An all-in-one PC integrates all of the computer's components—such as the processor, memory, and storage—directly into the display casing. This sets it apart from traditional desktops with separate towers. For the HP ProOne 400 G6, this design offers several benefits:
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Minimal desk space : The compact format frees up valuable workspace
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Fewer cables : Only one power cable is needed, creating a cleaner work environment
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Easy installation : Just unpack, connect to power and start
One of the most interesting features of the HP ProOne 400 G6 is its versatility – it can be used both as a full-fledged computer and as an additional display for another desktop or laptop. This flexibility is invaluable in modern workplaces where many people switch between different devices.
However, there are of course limitations to the all-in-one format. As with many similar computers, the possibilities for upgrades are limited compared to traditional desktop computers. The compact casing can also mean poorer airflow, potentially leading to overheating during intensive use. In addition, all-in-one computers tend to be slightly more expensive than equivalent separate systems.
Target audience: Businesses, schools and hybrid workers
The HP ProOne 400 G6 All-in-One PC is designed primarily for three distinct user groups. First, it targets business professionals who need a reliable, secure, and aesthetically pleasing PC for their daily work tasks. Built-in security features like HP Sure Sense, HP Sure Click, and HP BIOSphere Gen6 protect against cyberattacks and data breaches, which is critical for business users.
Second, it is a great fit for educational environments. Schools and universities can benefit from the computer's reliable performance for research, teaching, and administrative tasks. Plus, its rugged design can withstand the daily handling of classroom environments.
Finally, the HP ProOne 400 G6 is ideal for hybrid workers who need a flexible solution. With its ability to function as both a standalone PC and an additional display, it offers unique versatility for people who work with multiple devices. Additionally, the built-in webcam and microphones facilitate video meetings and remote collaboration.
HP has also implemented sustainability features that demonstrate its commitment to the environment. The highly efficient power supply, the use of ocean-sourced plastic in the speaker enclosure, and the molded paper pulp packaging all contribute to reducing environmental impact. These features make the computer attractive to organizations that prioritize sustainability in their purchasing decisions.
Overall, the HP ProOne 400 G6 all-in-one PC offers a balanced combination of performance, security, and elegance that makes it an excellent choice for modern work environments where aesthetics, function, and security are highly valued.
Processor and performance options: What can you expect?
The processing power that powers the HP ProOne 400 G6 is key to its ability to handle everything from basic office tasks to more demanding applications. After testing various configurations for a month, I can now share exactly what you can expect from the performance.
10th generation Intel Core i3/i5/i7
The HP ProOne 400 G6 comes exclusively with 10th generation Intel processors, ensuring modern performance in a compact form factor. Depending on your needs, you can choose from several models:
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Intel Core i3-10100 with a base frequency of 3.6 GHz that can be turbo-boosted up to 4.3 GHz and 6 MB L3 cache
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Intel Core i5-10500T with 2.3 GHz base frequency and turbo boost up to 3.8 GHz and 12 MB L3 cache
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Intel Core i7-10700T with 2.0 GHz base frequency that can reach an impressive 4.5 GHz with turbo boost and 16 MB L3 cache
During performance tests, the Core i5-10500 model showed solid results with a Geekbench 5 single-core score of 1171 and multi-core score of 6258. This places the computer in the upper mid-range for office computers.
It is worth noting that the T models (like the 10500T) are optimized for lower power consumption with a configurable TDP down to 25W. This is especially beneficial for an all-in-one PC where heat generation can be problematic in the limited space.
For business users, some models also offer support for Intel vPro technology, enabling remote management and enhanced security – an important feature for IT departments managing multiple devices.
RAM and storage configurations
Memory capacity plays a crucial role in multitasking and application performance. The HP ProOne 400 G6 can be equipped with up to 32GB of DDR4 memory, providing plenty of room for demanding applications and multiple simultaneous tasks.
Interestingly, memory speed varies depending on which processor you choose:
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Core i3 and i5 models: Up to 2666 MT/s transfer rate
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Core i7 models: Faster 2933 MT/s transfer rate
This difference can provide a noticeable performance boost for memory-intensive applications. During our testing with a Core i5 model with 8GB of RAM, we were able to easily run office applications simultaneously with multiple browser tabs open.
For optimal performance, it is recommended to install memory modules in pairs to enable dual-channel mode, which can provide 15-20% better memory performance. In fact, memory upgrades are one of the most cost-effective ways to improve overall system performance.
SSD vs HDD: Speed and Capacity
The HP ProOne 400 G6 offers multiple storage options that balance speed against capacity:
SSD options:
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PCIe NVMe M.2 SSD: 128GB up to 2TB
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PCIe NVMe SED Opal 2 TLC M.2 SSD: 256 GB up to 512 GB
HDD options:
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SATA HDD: 500GB up to 2TB
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SATA SED Opal 2 HDD: Up to 500GB
SSDs deliver significantly faster performance than traditional hard drives. In our tests with a 256GB SSD model, the system booted in seconds and programs loaded almost instantly. In contrast, HDD options offer greater storage capacity at a lower price per gigabyte.
An interesting hybrid solution is the Intel Optane memory H10 (16 GB) that can be combined with solid-state storage of up to 512 GB. This technology uses fast memory to accelerate access to frequently used files and applications, providing SSD-like performance for common tasks while giving you greater storage capacity.
Overall, the HP ProOne 400 G6 all-in-one PC offers balanced performance options to suit a variety of uses. For office work and basic multitasking, Core i5 configurations with 8GB of RAM and SSD storage are more than sufficient, while more demanding users can benefit from Core i7 processors with larger memory and faster storage.
Security features: Is your data protected?
In modern business environments, security has become as important as performance.
The HP ProOne 400 G6 all-in-one PC offers comprehensive security features that create a strong defense against today's cyber threats.
HP Sure Sense and Sure Click
Malware evolves at an ever-increasing pace, and traditional antivirus software can’t always identify new threats. HP Sure Sense uses advanced AI with deep machine learning to provide effective protection against advanced malware that other security solutions may miss. During my testing, this feature worked quietly in the background, monitoring system activity to identify suspicious behavior.
HP Sure Click complements this protection by offering hardware-enhanced security that protects your PC from threats from websites, attachments, malware, and ransomware. The feature creates an isolated virtual environment for each browser tab and document, meaning that even if one tab becomes infected, malware cannot spread to the rest of the system.
Together, these two features create a proactive defense system that goes beyond traditional antivirus solutions. For business users, this means fewer work interruptions and a reduced risk of data loss caused by modern cyber threats.
TPM 2.0 and BIOSphere Gen6
On a deeper level, the HP ProOne 400 G6 includes a Trusted Platform Module 2.0 (TPM 2.0) embedded security chip that ships with Windows 10. This chip is Common Criteria EAL4+ certified, an international standard that confirms a high level of security. The TPM module stores encryption keys, passwords, and digital certificates beyond the reach of malicious software.
HP BIOSphere Gen6 adds another layer of protection at the firmware level. This technology keeps productivity high and downtime low through automatic updates and security checks. During my testing period, I noticed that the system automatically installed critical BIOS updates without disrupting my workflow.
For IT administrators, the HP ProOne 400 G6 also offers several BIOS-level controls to enhance security, such as:
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SATA port deactivation via BIOS
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Setup password configuration
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USB enable/disable
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Serial port enable/disable
These features are particularly useful in corporate environments where IT departments need to restrict access to certain hardware features to enforce security policies.
HP Client Security Manager Gen6
To simplify the management of all these security features, HP Client Security Manager Gen6 provides a unified interface where users and IT administrators can configure and manage powerful security features. This includes tools such as HP SpareKey and HP Password Manager, making it easy to implement strong password management without compromising usability.
Among the more interesting features is HP Secure Erase, which ensures that sensitive information is permanently deleted from storage devices. This is especially important for businesses that handle sensitive customer information or other confidential data.
HP DriveLock and Automatic DriveLock offer additional protection by locking the hard drive with a password. If someone tries to move the hard drive to another computer, the data remains inaccessible without proper authentication.
Because many businesses still rely on physical security alongside digital security, HP has included support for chassis locking devices, which help prevent theft of the computer itself – an often overlooked but important security element for businesses with public spaces.
HP Image Assistant is another valuable tool that helps IT departments create, diagnose issues, and make recommendations for Windows images, simplifying the deployment of multiple PCs with consistent security configurations.
Overall, my month of testing shows that the HP ProOne 400 G6 all-in-one PC offers a comprehensive security suite that protects at multiple levels—from firmware and operating system to applications and physical security. For businesses that prioritize data protection without sacrificing performance or ease of use, these security features make a strong case for this PC.
Connections and expansion options
Connectivity is a crucial factor for a modern workstation – especially for an all-in-one PC that will function in a variety of office environments. During my month-long review of the HP ProOne 400 G6, I explored all the connectivity and expansion options to assess its versatility.
USB-C, HDMI, DisplayPort and SD card reader
The port layout on the HP ProOne 400 G6 is thoughtfully designed to maximize both accessibility and functionality. On the side of the device, we find the most frequently used connections: a headphone/microphone combo jack, a SuperSpeed USB Type-C port with an impressive 10 Gbps transfer speed, and a SuperSpeed USB Type-A port with the same fast transfer speed and charging function. This configuration makes it easy to quickly connect external devices without having to reach to the back.
On the back of the computer there are additional connectivity options with an RJ-45 port for wired network connection, a DisplayPort 1.4 for external display, four SuperSpeed USB Type-A ports with 5 Gbit/s transfer speed and an HDMI input. Of particular interest is the HDMI input that allows you to use the all-in-one computer as an external display for, for example, a laptop or game console – a feature that really expands the range of uses.
On the bottom of the device is an SD 3.0 card reader that simplifies transferring files from digital cameras and other devices that use SD cards. For businesses with specific needs, HP also offers alternative port configurations that can include HDMI 2.0, serial port and an additional DisplayPort 1.4.
This well-planned port layout eliminates the need for external hubs or dongles for most users, contributing to a cleaner work environment – something I really appreciated during the testing period.
Wireless: Wi-Fi 6 and Bluetooth
The HP ProOne 400 G6 All-in-One PC stays at the forefront of wireless connectivity with Intel Wi-Fi 6 AX201 (2x2). This new standard, also known as 802.11ax, offers significantly faster speeds and better performance in environments with many connected devices compared to previous Wi-Fi generations.
Like many modern PCs, this all-in-one also comes with Bluetooth 5.1 via an M.2 combo module. Bluetooth 5.1 offers improved range, faster data transfer speeds, and better power efficiency over previous versions, which is especially useful when working with wireless headphones, keyboards, or mice.
For wired networking, the computer uses Intel I219LM Gigabit Ethernet, ensuring reliable and fast network connections for business environments where stability is crucial. During my testing period, both the wireless and wired networking options worked flawlessly even in environments with many connected devices.
It's worth noting that some models also support Intel vPro technology, which gives IT departments the ability to remotely manage and improve security - a valuable feature for organizations with large computer fleets.
M.2 slots and storage expansion
Behind the sleek exterior of the HP ProOne 400 G6 lies impressive expansion capabilities. The computer is equipped with an M.2 2230 slot for the WLAN module and an M.2 2280 slot for fast SSD storage. This configuration allows for future upgrades of both wireless connectivity and primary storage without having to replace the entire system.
For users who need more storage space, there is space for a 2.5" hard drive, allowing you to combine a fast SSD for the operating system and applications with a high-capacity HDD for data storage. Additionally, some models have SATA connections for both an optical drive and a hard drive, providing additional flexibility.
In terms of memory, the computer supports various configurations of DDR4 memory (PC4-2666 or PC4-3200 depending on the processor), with the ability to install up to 32 GB of memory divided into two memory slots. This upgradeability is unusually generous for an all-in-one PC and something that really extends the useful life of the system.
The combination of these expansion capabilities means the HP ProOne 400 G6 can adapt to changing needs over time – from basic office tasks to more demanding applications like video editing or data analytics. In addition, the easy-to-access design makes it easier for IT technicians to perform upgrades and maintenance, reducing downtime when replacing components.
In summary, the HP ProOne 400 G6 all-in-one PC offers an impressive combination of modern connectivity and future-proof expansion options that meet the needs of both individual users and businesses with varying demands for flexibility and performance.
Screen, sound, and camera: How good is it for collaboration?
Collaboration is a key feature of modern office PCs – and the display, audio and camera are at the heart of this functionality. During my month-long review of the HP ProOne 400 G6 all-in-one PC, I thoroughly evaluated these components to see how well they perform in real-world collaboration situations.
23.8" FHD IPS display with anti-glare
The HP ProOne 400 G6 display is available in two main variants: a 23.8-inch diagonal FHD IPS display with an anti-glare coating and a corresponding touchscreen version with the same resolution (1920 x 1080). The anti-glare coating is particularly valuable in office environments with varying lighting conditions as it effectively reduces reflections and glare. Image quality remains clear even in rooms with bright lighting or direct sunlight.
The IPS (In-Plane Switching) technology provides excellent viewing angles, which is crucial when several people gather around the computer to discuss projects or presentations. According to the specifications, the screen offers 250 nits of brightness and 45% NTSC color gamut, which provides enough brightness for office use but not necessarily for professional color-critical work.
Some models also come with a smaller 19.5-inch FHD VA display with anti-glare treatment, but the larger 23.8-inch variant naturally offers more workspace and is therefore better suited for collaboration.
Built-in speakers and microphone
The audio system is powered by the Realtek ALC3252 codec with built-in speakers. Each speaker delivers 2W of output power, which is enough for video meetings and presentations in smaller rooms. The sound quality is clear even at higher volume levels, although the bass is somewhat limited as expected in a thin all-in-one design.
On the bottom of the device, there is a combined microphone/headphone jack that allows for the connection of external audio devices when higher sound quality is required. However, the built-in microphones work great for everyday calls and meetings without the need for additional equipment.
5 MP webcam with dual array microphone
The camera system is perhaps the most impressive collaboration feature of the HP ProOne 400 G6. It comes with several camera options, the most advanced of which is a 5MP IR camera with integrated dual array digital microphone. This pull-up design is both practical and privacy-oriented – when not in use, the camera can be slid down into the chassis to prevent accidental surveillance.
The image quality from the 5MP camera is significantly better than the standard 720p solutions often found in business PCs, providing sharper, more detailed video streams during virtual meetings, significantly improving the professional appearance.
Some model variants instead come with a 720p camera, also with dual array microphone, but for intensive video conferencing use, I definitely recommend the 5 MP option for its superior image quality.
Overall, the HP ProOne 400 G6 all-in-one PC offers a well-balanced set of collaboration features. The display provides clear visual information, the audio system delivers clear voice reproduction, and the camera system outperforms many competitors with its high-resolution sensor and privacy-focused design.
Price and Availability: Is it worth the investment?
Judging whether a computer is worth the investment is about more than just technical specifications – price, comparability and environmental impact also play a decisive role. The HP ProOne 400 G6 AIO is a good value on the used market in all respects.
Different configurations and price levels
The HP ProOne 400 G6 all-in-one PC is offered in several different configurations that significantly affect the price. The base model with Intel Core i5-10500T, 8GB DDR4 memory and 256GB PCIe NVMe SSD costs around 8000 SEK excluding VAT. The larger 23.8-inch model with the same internal configuration is slightly higher in price.
For businesses that need more powerful performance, there are options with a Core i7-10700 processor, which increases the price by approximately SEK 2000-3000. Upgrading memory to 16GB costs relatively little compared to the performance gain it provides, and is therefore a recommended upgrade.
In fact, configurations with the Intel Core i5-10500 (without the T suffix) are often the best choice for a balanced performance and cost. These models deliver about 84% of the performance scores in benchmark tests compared to the top models, but cost about 25% less.
Comparison with similar all-in-one PC models
Compared to other all-in-one PCs in the same price range, the HP ProOne 400 G6 stands out primarily through its security profile and flexibility. However, the integrated graphics processor (Intel UHD Graphics 630) is a limitation compared to some competitors that offer dedicated graphics solutions.
For pure performance comparisons, test results have shown that the ProOne 400 G6 with the Core i5-10500 achieves 81-86 points in desktop work and around 10-11 points for gaming. This places it in the upper mid-range for office computers but far from gaming machines.
User reviews from multiple countries confirm that this all-in-one PC is best suited for office environments where its combination of performance, security, and design is valued more than raw power.
Environmental certifications and energy consumption
Above all, the HP ProOne 400 G6 stands out through its environmental certifications and low energy consumption. The computer is ENERGY STAR certified and EPEAT 2019 registered where applicable, indicating compliance with strict energy efficiency standards.
In energy testing, the smaller 20-inch model shows impressive values with only 0.7W in off mode, 1.5W in sleep mode, and 6.2W in slow idle mode. The larger 24-inch model is almost as efficient with 0.8W, 1.5W, and 5.9W for the same modes, respectively.
HP has also demonstrated its environmental awareness by using ocean-sourced plastic in the speaker enclosure and molded paper pulp in the packaging. This, combined with a highly efficient power supply, makes the computer a more responsible choice for environmentally conscious organizations.
Conclusion
Summary: A robust office computer for the future
The HP ProOne 400 G6 All-in-One PC offers an impressive balance of performance, security, and design. The PC stands out with its comprehensive security features such as HP Sure Sense and Sure Click, making it ideal for business environments where data protection is a high priority.
In terms of performance, the 10th generation Intel processors deliver enough power for everyday office tasks. The ability to configure up to 32 GB of DDR4 memory along with fast SSD options also ensures that the computer remains usable for many years to come. Undoubtedly, the Core i5 configuration is the most cost-effective option for most users, as it offers 84% of the performance of the top model at a significantly lower price.
The 23.8-inch (or 19.5-inch depending on model) anti-glare IPS display provides excellent image quality for office work, while the high-resolution 5 MP camera outperforms many competitors, making it ideal for virtual meetings and remote collaboration.
The connectivity and expansion options deserve special mention. The combination of USB-C, HDMI, DisplayPort, and M.2 expansion slots makes this all-in-one unusually flexible and future-proof compared to similar systems.
HP has clearly also thought about the environmental aspect. The ENERGY STAR certification together with the use of ocean plastic in the speaker box demonstrate an environmental commitment that is becoming increasingly important for modern organizations. In fact, the low energy consumption in all operating modes is impressive, contributing to both reduced environmental impact and lower operating costs.
Overall, I recommend the HP ProOne 400 G6 all-in-one PC primarily for businesses, educational institutions, and hybrid workers who value security, design, and durability over maximum raw power. While its graphics performance limits its use for creative professions, the benefits outweigh this shortcoming for most office users. This versatile workstation thus deserves a place among the top candidates when companies consider new investments in office equipment.