For the last year and a half I've been running this system:

Epox 8RDA+ Rev 1.0
Athlon XP 2500+ Barton
PNY Geforce 4 Ti 4600
2x 512MB Corsair XMS PC3200
Antec SL400 PSU

The first month or so, I spent overclocking and hitting my proverbial wall, which was 200x11, with 2-3-3-7 timings.

Six months ago, I ordered a Gainward Geforce FX 5950 ultra to upgrade, and I installed it. When I was installing it I noticed a black residue on the top part of the ATX connector in the motherboard inside of the plugs. I honestly didn't know...