Radeon X1900 and mac pro graphics problems

Hi all,
i've a mac pro with two xeon cpu's (2,66GHz) in it. 2GB main memory and a radeon X1900 graphics card. on this mac i use bootcamp beta 1.4, installed the newest driver for this version from the apple support side. also i have updated the graphics FW to the newest version. so all things are on up to date.
my problem is the following: if I play some very graphics intensiv games like STALKER or BIOSHOCK (yes i use my mac for works and sometimes to play), it seems that the graphics card will be to hot. I get a lot of pixel errors. horiz. lines and after a while windows xp is freezeing. so I must reboot the maschine. also VPU recovery comes up.
I've tried several settings (800x600/1024x768/until maximum). 2-3 minutes the game is running well. after that my fans spin up like a plane, get the errors on the pixel side and the game crashes or windows xp is freezing.
i don't know any solution yet. can anyone help me? have some others the same problem?
many thanks
Andy

Hi There,
I was having the exact same problem playing command and conquer 3 in Win XP. I'd play for about 5 minutes or so with the fans spinning at full speed (sounding like the mac was about to 'takeoff'), and then it would just crash.
I followed the advice here, took the graphics card out, clean the dust out and hey presto, the problem was fixed! My MacPro is about 6 months and i was surprised how much dust had got clogged up in there!

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