What to do?? GF4 MSI Ti4800

I have a MSI Ti4800se 128m vid running at 305/610(stock 275/550). Ive experienced a couple issues in games running choppy or laggy. Im thinkin it could be the Vid, memory, or Motherboard. At present Im using the 56.72 dets. Ive tried various other drivers and had no luck. Would a new cooler to replace the stock one help out any?? And if so.........what are some recommendations for cooling fans and what is the process of lapping?? Thx.

305/610 ?

My Ti-4200 is at 324/608 from 250/513. But overclocking is like a box of...

I had a similar issue (280/580 ) and I replaced my AGP card to find it didn't cure anything. I hadn't killed anything after all.

I found that my Ti4200 w/8x stutters and hitches with 56.72 Forceware and below (49.xx and above). It locks up with some 60.xx drivers too. CoD and OpenGl especially.

Could be hardware failure, but in my experience.... it's usually the software....

Try a few drivers. 61.71 seems about the best recently for my cards.

My using 45.32 from MSI. Runs fine.