Video card overheating?

[asurething]

Hello. I have recently built a new computer. I am having problems with a game called Crysis Warhead. After a few minutes playing, the game shows strange things. Sometimes the sky will change color from blue to gray and then stay gray. When I fire a gun the trail it leaves stays in the video. Sometimes these odd black shapes appear. When I closed the game down the EVGA precision software shows both GPU's temp at 82 C. Is this too high? The card itself feels very hot. Here are my specs:

EVGA 9800GX2
XIGMATEK HDT-S1283 120mm Rifle CPU Cooler
Intel Core 2 Duo E8500 Wolfdale 3.16GHz
COOLER MASTER COSMOS 1000 RC-1000-KSN1-GP case
mushkin 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066
COOLER MASTER Real Power Pro1000 RS-A00-EMBA 1000W
ASUS MAXIMUS 11 FORMULA MB

Thanks for any help.