ti4600 overheating

[runya]

i got a nvidia ti4600 a while ago. whenever i play games like morrowwind, neverwinter, or run 3dmark, my computer crashes and restarts, on win98, 2k, and xp. i always get a blue screen of death before it restarts saying something along the lines of "physical memory dump". im pretty sure its an overheating issue. to get to my point, right now i got to medium fans running directly across the edge of it, the generic fan/heatsink combo on the bottom, and a small fan sitting directly on the top over the CPU part. so when it overheats with 4 fans and a heatsink on it, i start to wonder if this is a common problem. i was just wondering if anyone else has had this problem and what they've done to combat it. i am currently looking at a heatpipe vga cooler, but i dont know if i could even install it because my heatsink i have now it glued onto the cpu. damn waste of $170. what good is a powerful GFX card if it constantly overheats?