I have a new X800 XL (AGP) video card. The MB is use is a asus a7v600. The BIOS has automatically set the 'graphics aperture size' to 128 MB. I cannot change this value; also, the BIOS is up to date. The x800xl is 256-bit and has 256MB RAM...so my question is: does having a 128MB MB aperture limit the performance of my new video card? Do I need a new MB to take advantage of this card fully?