Sorry if this is not specifically an X86-64 question. I have a Dual Opteron 250 with 4 GB of RAM with an NVIDIA QuadroFX 1100 card, with Suse 9.1 X86-64 installed with updates (kernel version 2.5.5-7.111.19-smp). The BIOS recognizes all 4 GB of RAM, but the OS only sees 3.26GB. I've been told this is because the video card is taking up system memory. But could it really be taking up this much? Changing the AGP aperture size in the BIOS does affect how much RAM is occupied by the video card. Currently it is set to 32 MB. If I set it to the maximum of 512 MB, a measly 2.4GB are available. I also thought this was strange - if I set the AGP aperture to 32 MB, and then try 1, 2, 3, and 4 GB, I see different percentages of system memory being unavailable. Here's what I see: 1 GB -> 91.8% 2 GB -> 95.2% 3 GB -> 96.4% 4 GB -> 81.5% Is their anything I can do in Suse to give me back more of my system RAM? Seems like that last GB was a waste of money... Thanks for any help you can offer. Ken