Hello! It seems like you are experiencing an issue where only 8GB out of your 16GB DDR4 RAM is being recognized by your system. This can be frustrating, but there are a few things you can try to troubleshoot and resolve the issue:
1. Check System Compatibility: Since you mentioned that your motherboard supports up to 64GB of RAM, it should not be a compatibility issue. However, it's always good to double-check if your specific RAM modules are compatible with your motherboard.
2. Reseat the RAM: It's good that you already tried swapping the RAM sticks and cleaning the sockets. Make sure the RAM sticks are properly seated in their slots. Sometimes, poor connections can cause the system to not recognize the full amount of RAM.
3. Update BIOS: Ensure that your motherboard's BIOS is up to date. Sometimes, BIOS updates can improve hardware compatibility and address memory recognition issues.
4. Enable Memory Remapping: In some cases, the system may not be properly remapping the memory. Check your BIOS settings for an option related to memory remapping or memory hole remapping and make sure it is enabled.
5. Check Resource Allocation in BIOS: Some motherboards allow you to allocate how much memory is reserved for onboard graphics. Make sure that your system is not reserving an excessive amount of memory for this purpose.
6. Check Windows Settings: Ensure that your operating system is recognizing the full amount of installed RAM. Sometimes, Windows settings or configurations can limit the usable RAM.
7. Run Memory Diagnostics: Use Windows Memory Diagnostic tool to check for any issues with the RAM modules. It can help identify if there are any faults with the memory sticks.
If after trying these steps you are still facing the issue, it might be worth contacting the manufacturer's support for further assistance. It's important to ensure that all components are working correctly for optimal system performance.