Here's my system specs:

Dell P3 733MHz
256MB PC-100 RAM
GeForce2 MX 400 64MB SDR PCI (w/ latest drivers)
7200RPM 20GB Maxtor HDD
Sound Blaster Live! Value
Windows XP Pro

Under Direct3D Settings the PCI Texture Memory Size is set at the default 31MB of system memory. I can go to a maximum of 127MB. And under OpenGL Settings, 5MB of system memory is set, which is default. I can go to a maximum of 16MB.

Will changing these values have any effect? What do you guys have them set at? My Virtual Memory is set to 512MB.

directX has nothing to do with any quake engine game.

and it will make very little difference since the game allocates its own texture memory.