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Windows XP and 4gigs of ram

C

CU

Platinum Member
I installed 4 1gig sticks of ram in a Dell GX620 today. It all shows up in the bios and cpuid. It also tests fine using memtest on one stick at a time. However, windows only sees 3.49 gig. I tired turning off the page file in XP, but that didn't help. What is causing this?
 
Your video card and other memory-mapped devices share the same 4GB address space as RAM.

Microsoft has a KB article or two on this, and/or try a search on "4 GB" here.
 
Yeah I just found some info on it. Thanks. It seems /PAE will allow it to use it all, but can cause it to be slower. Anyone use that to get access to 4gigs of ram?
 
Originally posted by: CU
I installed 4 1gig sticks of ram in a Dell GX620 today. It all shows up in the bios and cpuid. It also tests fine using memtest on one stick at a time. However, windows only sees 3.49 gig. I tired turning off the page file in XP, but that didn't help. What is causing this?
Click to expand...

That's normal. 4GB is the total amount addressable in 32-bit mode, and some of that is reserved for PCI. 3.5GB is pretty good... If you must have every last bit, you'll need to go to a 64-bit operating system.
 
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