Discount mulberry key ring Outlet Asus P5B only sees 3 GB of 2x2GB PC6400 SOLVED
Has 4 slots, manual says 8 GB capable. I was running 2×1 + 2×512 for a total of 3. I swapped out the 2×512 for the 2×2 and started Memtest. Memtest only showed 5 GB, wtf?
Further testing shows that either 2GB stick will show as 2GB in any slot when installed alone, but if I put both 2GB sticks in, the BIOS only shows 3 GB.
Where it gets even weirder is that I booted into Windows with both sticks, and CPU Z recognizes both sticks as 2GB, even though BIOS (and XP) only recognize a total of 3GB.
Still have to run every possible combination of sticks + slots, and maybe a BIOS update will fix it, but has anyone run into this before?
Edit: added mobo info:If you install four 1 or 2GB memory modules, the system may only recognize less than 3GB because the address space is reserved for other critical functions. This limitation appears on Windows XP 32 bit operation system which does not support Physical Address Extension (PAE)
That shouldn’t apply to the BIOS, though, correct? And when I have all 4 slots populated, the BIOS does show 5 GB.
Edit: clarification that problem is in BIOS.1. Disable Memory Remapping and have 3GB detected by the BIOS and 3GB available for Windows 32 bit;
2. Enable Memory Remapping and have 4GB detected by the BIOS and 2GB available for Windows 32 bit;
3. Enable Memory Remapping and have 4GB detected by the BIOS and 4GB available for Windows 64 bit;
Basically I can enable Memory Remapping, and the BIOS should see all of the RAM but XP will only see 2 GB.
Enabled Memory Remapping and installed both 2gb sticks. Got a crash/reboot loop when Windows was loading, either stick. It was late so I just reverted to my 2 x 1GB + 2 x 512 MB. The next day I re enabled M/R and took out the 512s, rebooted, all good. Added one 2G stick, booted, all good. Added the other one, booted, all good. So it works now, although I’m a little leery of that first boot issue.