Introduction
This manual provides comprehensive instructions for the installation, operation, maintenance, and troubleshooting of your A-Tech 16GB (2x8GB) DDR4 2666MHz PC4-21300 DIMM Non-ECC UDIMM Memory Upgrade Kit. This memory kit is designed to enhance the performance of compatible Fujitsu ESPRIMO desktop systems by expanding their memory (RAM) capacity, allowing for improved multitasking and overall system responsiveness.

Image: A-Tech 16GB (2x8GB) DDR4 Desktop Memory Kit, showing two 8GB modules packaged together.

Image: Banner highlighting performance upgrade benefits, showing A-Tech RAM modules.
Setup: Installation Guide
Before beginning the installation process, please read all instructions carefully. It is highly recommended to consult your computer system's specific manual for detailed instructions on accessing and installing RAM, as procedures may vary by model.
1. Pre-Installation Checklist & Safety Precautions
- Compatibility Check: Ensure your system is compatible with DDR4 DIMM memory and supports 2666MHz speed. This kit is specifically designed for Fujitsu ESPRIMO D586/M D586M, D588/VX, D9010 D3822, D9011 D3922, P556/E90+ D3400, P7011 D3923-A2, P9011 D3922 models.
- Power Off: Completely shut down your computer and disconnect the power cable from the wall outlet.
- Discharge Static Electricity: Touch a grounded metal object (e.g., the unpainted metal part of your computer case) before handling the memory modules to discharge static electricity. Consider using an anti-static wrist strap.
- Tools: A Phillips head screwdriver may be required to open your computer case.
- Work Area: Work on a clean, flat, and well-lit surface.
2. Physical Installation Steps
- Open Computer Case: Carefully open your computer's side panel or case according to your system's manual.
- Locate RAM Slots: Identify the DIMM slots on your motherboard. These are typically long slots with clips on either end. Note the existing RAM configuration if any.
- Remove Existing RAM (if applicable): If you are replacing existing RAM, gently push the clips on both ends of the DIMM slot outwards. The module should pop up slightly, allowing you to carefully pull it straight out. Store removed modules safely.
- Prepare New RAM: Remove the A-Tech memory modules from their anti-static packaging. Hold the modules by their edges, avoiding touching the gold connectors or the chips.
- Insert New RAM: Align the notch on the bottom of the memory module with the key in the DIMM slot. The module will only fit one way. Push down firmly and evenly on both ends of the module until the clips on the sides snap into place, securing the module. Ensure the module is fully seated and the clips are locked.
- Repeat for Second Module: If installing both 8GB modules, repeat the process for the second module in the appropriate slot (refer to your system's manual for dual-channel configuration guidelines, often requiring matching slots, e.g., slots 1 and 3, or 2 and 4).

Image: Two individual A-Tech 8GB DDR4 memory modules, ready for installation.

Image: A close-up view of a single A-Tech DDR4 RAM module, highlighting the gold contacts and chips.

Image: Various desktop computer setups, demonstrating the broad compatibility of the RAM.

Image: Banner indicating compatibility specifically for desktop computers/PCs.
3. Post-Installation
- Close Case: Once the memory modules are securely installed, close your computer case.
- Reconnect Power: Reconnect the power cable and any other peripherals.
- Power On: Turn on your computer.
Operating: Verifying Installation
After installation, it's important to verify that your system recognizes the new memory.
- BIOS/UEFI Check: Upon booting, enter your system's BIOS or UEFI settings (usually by pressing F2, Del, F10, or F12 during startup). Look for a "System Information" or "Memory" section to confirm the total installed RAM.
- Operating System Check:
- Windows: Right-click on "This PC" or "My Computer," select "Properties." The "Installed RAM" or "Memory" amount should be displayed. Alternatively, open Task Manager (Ctrl+Shift+Esc), go to the "Performance" tab, and select "Memory."
- macOS: Click the Apple menu, select "About This Mac." The "Memory" information will be listed.
- Linux: Open a terminal and type
free -horcat /proc/meminfo.
If the displayed memory matches the total installed (e.g., 16GB), your installation was successful. Your system should now benefit from improved performance and multitasking capabilities.

Image: Illustrates enhanced multitasking capabilities with increased RAM, showing a user working on a computer with multiple screens.
Maintenance
A-Tech memory modules are designed for long-term reliability and typically require minimal maintenance. However, following these general guidelines can help ensure optimal performance and longevity of your computer components:
- Keep System Clean: Regularly clean the interior of your computer case to prevent dust buildup, which can impede airflow and lead to overheating. Use compressed air to gently remove dust from components, including RAM modules and slots.
- Proper Handling: When handling memory modules, always hold them by the edges to avoid touching the gold contacts or integrated circuits. Static electricity can damage sensitive electronic components.
- Environmental Conditions: Operate your computer in a well-ventilated area with stable temperature and humidity to prevent component stress.
Troubleshooting
If you encounter issues after installing your A-Tech memory, consider the following common troubleshooting steps:
- System Does Not Boot or No Display:
- Reseat RAM: Power off the computer, disconnect power, and carefully reseat the memory modules. Ensure they are fully clicked into place and the clips are secure.
- One Module at a Time: If you installed multiple modules, try booting with only one module installed in the primary slot (refer to your motherboard manual for primary slot designation). If it boots, test each module individually to identify a faulty one.
- Clear CMOS: Consult your motherboard manual on how to clear the CMOS (BIOS settings). This can sometimes resolve boot issues after hardware changes.
- Incorrect RAM Amount Detected:
- Reseat RAM: As above, ensure modules are fully seated.
- BIOS/UEFI Update: Check your motherboard manufacturer's website for the latest BIOS/UEFI updates. An outdated BIOS might not fully support new memory modules.
- Operating System Limitations: Ensure your operating system (especially 32-bit versions) supports the full amount of RAM you have installed. 32-bit operating systems typically only recognize up to 4GB of RAM.
- System Instability (Crashes, Blue Screens):
- Run Memory Diagnostic: Use built-in Windows Memory Diagnostic Tool or third-party tools like MemTest86 to check for memory errors.
- Check Compatibility: Double-check that the memory specifications (DDR type, speed, voltage, ECC/Non-ECC) match your system's requirements.
If issues persist after attempting these steps, please contact A-Tech Technical Support for further assistance.
Specifications
Detailed technical specifications for the A-Tech 16GB (2x8GB) DDR4 2666MHz PC4-21300 DIMM Memory Upgrade Kit:
| Feature | Specification |
|---|---|
| RAM Capacity | 16 GB (2 x 8 GB Modules) |
| RAM Type | DDR4 DIMM |
| Memory Speed | 2666 MHz (PC4-21300 / PC4-2666) |
| Pin Count | 288-Pin |
| Error Correction | Non-ECC Unbuffered |
| Voltage | 1.2V (DDR4 Standard Voltage) |
| Model Number | ASO458 |
| Product Dimensions | 5.25 x 1.18 x 0.15 inches (133.35 x 30 x 3.8 mm) |
| Compatible Devices | Fujitsu ESPRIMO D586/M D586M, D588/VX, D9010 D3822, D9011 D3922, P556/E90+ D3400, P7011 D3923-A2, P9011 D3922 |

Image: Technical diagram illustrating the dimensions of a DDR4 DIMM module (133.35mm / 5.25in length, 31.24mm / 1.23in height).
Warranty and Support
A-Tech stands behind the quality and reliability of its products.
- Limited Lifetime Warranty: All A-Tech memory modules undergo stringent quality control testing and are backed by A-Tech's Limited Lifetime Warranty.
- Technical Support: Our knowledgeable Tech Team is available to provide assistance before and after your purchase. For support, troubleshooting, or warranty claims, please visit the official A-Tech website or contact their customer service.
- Online Resources: For additional information and resources, including FAQs and support contact details, please visit: atechmemory.com/pages/qr

Image: Banner emphasizing the reliability of A-Tech memory modules, highlighting extensive quality control testing.





