Yes, image degredation c/b artifacts. Often it looks like snow or dots. There are a number of different kinds.
If not OCing, usually it's heat or a bad/defective card
Mobile XP 2600+ (11X215)
Abit NF7-S v 2.0
Maxtor 60GB ATA 133 7200RPM
512MB Corsair Twinx 3200LL
BBA 9800 Pro
Enermax Noisetaker 420 watts
Win2K sp4