RAMissues Posted November 12, 2005 Share Posted November 12, 2005 I recently upgraded my computer from 2 gigs of memory to 4. When I put the two new sticks in, both the startup memtest and windows only detected 2.8 gigs. The BIOS correctly reports 4 gigs, and both pairs give 2 gigs when used independently. Any ideas? Motherboard: D875PBZ RAM: Two sets of TWINX2048-3200PT Link to comment Share on other sites More sharing options...
RJLeong65 Posted November 12, 2005 Share Posted November 12, 2005 The upper 1.2GB of that 4GB is reserved for PCI routing. Thus, only 2.8GB of that 4GB is available to Windows or any other software. Link to comment Share on other sites More sharing options...
RAMissues Posted November 15, 2005 Author Share Posted November 15, 2005 Could you go into more depth here? I mean, my motherboard says it supports up to 4 gigs of memory, so I expected I'd actually have 4 gigs available to use, rather than 2.8. I had full access to the 2 gigs that were in previously, which would imply none of it was reserved for PCI routing. Is there any point in having 1.2 gigs devoted to PCI routing? Is there a way to disable this PCI routing reservation? If the 2 gig kit isn't doing me any good, I'd rather return it and get a 1 gig kit, since I'd get most of what I paid for that way. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 15, 2005 Corsair Employees Share Posted November 15, 2005 This is a chipset limitation and I am sure the MB maker will be able to answer this for you. Link to comment Share on other sites More sharing options...
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