SamiiRoebuck

Memtest - it only recognises half the ram, when there's 16 installed it shows 8, but shows no errors However, when the RAM is installed one by one it recognises them all properly with no errors. BIOS/UEFI - always shows the full amount installed Windows - shows 16gb but only 8gb as usable and the rest hardware reserved. Does anyone know any reason for this and/or know which is right? Or how to stop half RAM being reserved?

Unfortunately, we are yet to find any solution to this! Still looking though!

Full computer scan conducted, no threats found to computer

64-bit Window 10 Pro. The only thing I have downloaded currently is CPU-Z as I formatted the SSHD before reinstalling Windows. No antivirus has been reinstalled since formatting the drive, however, there was no virus issues before then. I will install an antivirus now and run a scan to double check.

In short, the issue with my PC is that inside of Resource Monitor the hardware reserved for the RAM is half when 16GB is installed. After testing RAM and finding the PC wouldn't boot if RAM sticks were in slot 1 and/or 3 (without anything in 2 and/or 4) I concluded it was a MOBO issue and brought a new one. However, the issue persisted. However, no matter what Windows says, the bios always recognises all RAM installed at correct frequency and voltage. If there is RAM in slots 2 and/or 4, the bios will recognise any ram in slots 1 and 3. We've tried Unchecked maximum memory All RAM sticks have been tested and do work Cleared CMOS and updating BIOS Bought new MOBO and RAM Ran windows memory test and it found no issues Checked all RAM is running at the correct speed Checked CPU for bent pin and socket for any debris and found nothing Reinstalled Windows Other issues found XMP works sometimes, seems to be no correlation with RAM sticks One set of original RAM wouldn't rank in dual channel in CPU-Z All RAM is the same model but has different version numbers For reference, this is what I mean when I say 1 and 3, as these are the slots names from the MOBO manual. After scouring the internet for a possible solution, I have run out of ideas so any help would be greatly appreciated. Build CPU: AMD FX 6300 OLD MOBO: Gigabyte GA-970a-UD3P NEW MOBO: Gigabyte Ga-990X-GamingSLI RAM: Corsair Vengeance 16GB 4x4GB (With an extra 2x4GB for testing) Heatsink: Cooler Master EVO 212 GPU: Sapphire R9 270X 4GB PSU: EVGA 600B Drive: Seagate 2TB SSHD