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i got my pny to do 300/600 with the stock heatsink and no ram sinks and from what i hear the pny cards are pretty crappy overclockers. they only thing on the card thats not stock is the fan because the old one started to rattle like mad and i new it was affecting my proformance so i rubberbanded a 60mm fom and amd stock hsf on there. ROFL i will never buy pny anything ever again. stupid pos....
I had my MSI Ti4400 running at 305/650 for about 6-8 months. Then I tried getting Win98SE to run with 1GB of RAM and in the process my video card decided it didn't like 305/650 anymore. so I then ran it at 290/580 for a while and tried the Win98SE/1GB of RAM thing again after 2 months and had to clock it back to the 275/550 default speeds. But that didn't really matter too much because Nvidia released new drivers and I was able to get almost the same 3DMark score as I was getting with the 305/650 overclock. The video card was the only thing in my system that was overclocked.
What you want to do is gradually overclock the card and at each step run 3DMark and an artifact checking program (can't remember the name) to see if it worked. Also, try running fav. game and see what happens. Increase the GPU by 5 and VRAM by 10, so try these increments: 280/560, 285/570, 290/580, 295/590, 300/600, 305/610, etc if you can. I started experiencing artifacts and 3DMark running problems at 310/620 with my MSI card, so I clocked back to 305/610 with no problems. At this point I knew that the GPU would not go any further, so I tried overclocking the RAM a bit more and stopped at 650 (the Ti4600 VRAM speed). So I ended up at 305/650 with my MSI card.