I just had a thought that might bear looking into. The power supply on Dell Dimension 8200 is only 250 watts. I really don't think that's enough power to run that level of video card and two mice + other peripherals? Also, verifying this in the system documentation http://support.dell.com/support/edoc...cs.htm#1101572 I also noticed that the AGP slot is only 4x. I'm not sure if that would cause such a noticeable drop in performance, but it's possible the combination of the two issues could...?
It has been happening since before I modified the Dell. When first purchased it had 1 mouse, 512mb of ram and a Geforce 4 MX420. The problem actually improved a bit when I got my 9800 pro, so I don't think it's an inneffective power supply. Dell power supplies are measured differently, so my power supply is actually much more than 250.
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