I have an old Dell Dimension 8200 and I recently bought a 256 MB Visiontek ATI Radeon X1050 to replace the 64 MB GeForce4 Ti 4200 it came with. The performance increase has been a little underwhelming. I know the Radeon X1050 isn't running at maximum performance since it's in a AGP 4x slot, but is it OK that the slot is 1.5V? Are there any video cards that might perform better in a AGP 4x slot but are still fairly new?