5
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.
41/ press the sticks down firmly, to make sure they are properly installed. 2/ get 1 stick at a time to show up, by removing them all, and trying one by one. It's usually the simplest things, hence 1. – Alister Bulman – 2009-05-03T19:22:30.550
You can also try a memtest to check if everything is okay – setatakahashi – 2009-05-07T12:04:55.483
1This answer was the closest to being correct, so points to you. I ran CPU-Z and it reported that Slot C1 was empty, so I opened the case, reseated the stick, and it's now coming up as 2.99 GB in WinXP and 3 GB in the BIOS. – Scott – 2009-05-29T03:06:48.530