Last year I built a Core i7 920 system based on the ASUS P6T Deluxe motherboard. I have 3x1GB of DDR3 (triple-channel configuration), but only 2GB is being reported by: Windows XP, CPU-Z, the BIOS. Is this a hardware problem, or is the third gigabyte of RAM being reserved by the system for video card-related stuff? The video card has 512MB of RAM.
I realize that 32-bit Windows XP is not the ideal operating system for more than 2GB of RAM, but from what I've read it should be reporting at least 2.5GB.
Answer
If the BIOS is reporting 2Gb, then it's a hardware or BIOS problem, nothing to do with XP.
First thing I'd do is try the RAM two sticks at a time to see whether they're all good. Second thing would be checking if a BIOS upgrade is available.
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