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However, with other games (NWN), as I tried to maximize the graphical settings (e.g. add antialiasing, etc), the GPU and RAM would sometimes overheat, with the Fan never passing the ~3,600 RPM when set to "manual - 100% power".
As I am very pedantic, I decided the overheating occured because the fan was malfunctioning (after all, it has a graph of upto 10,000 RPM and it just uses 35% of it...) so I thought this was the problem, and I sent the card to Asus for a replacement.
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Define overheat
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I have gotten some extreme overheating just a few minutes into the game: GPU 89c and RAM 79c.
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Thats not overheating. The 6800s can breach 100C without blinking (or throttling, unless youve set them to)
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The funniest thing is how UN-helpful Asus are: I have contacted them several times just to get silly questions like "are you over-clocking?" or "have you installed the latest drivers?"..
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Annoying yes but you have no idea how neccesary it is to ask those questions.
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What can I do to stop the overheating, the system freezes and black screens?
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Im not convinced its overheating -- ive ran a 6800GT and 6800U without a fan along with Particule Fury (albeit not for very long) ... now THAT's overheating
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The only possible important detail I can think of is my power supply, which is 420W but from a cheap make. I *could* get a Thermaltech 420W which would be much more stable and reliable... but would this solve the problem or would I just be spending $70 (this is what it costs here in Israel!) just to see the overheating and freezes repeat themselves??
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Its good that you mention that. How stable ARE your rails?

(use ASUS probe to check ... have it start loggin and then play some games until it crashes)