Ati Radeon HD 4890 overheating

Hey there,

90C is high but not excessive. Cards are usually rated for 100C.

Place a couple of 120mm case fans facing the cards to assist with airflow then lower fan profile to 50%.

By doing this, my rig runs at 52C idle and NEVER exceeds 85C under load.

Also, check fans/grills for dust buildup and clean monthly.

Good luck.

As hunuok suggested, adding an intake fan near the cards' fans should reduce their temps by allowing fresh, cool air to get into the cards.

If you cannot add side-fans to your case, try one of these Antec SpotCool fans inside the case. Mind you, you'll still need sufficient fresh air coming into the case already. So, if you don't already have a strong enough intake fan, then I suggest getting one (or two of supported) in addition to the SpotCool.

Lastly, here's a diagram of a positive air pressure system and an explanation of it's benefits. http://www.demcifilter.com/positive_pressure.htm

Don't vent more air out unless you can also bring more cool air in, otherwise you're forcing the card, the PSU, and all other exhaust fans or self-exhausting devices to compete with each other for fresh air.

And when you say "fans running at 75%" what fans are you talking about, your video card fans? If so, what you really need is to get more air to them, not try and suck more air out of the system.

I hate to use a car analogy, but think about drag racing a second. When they want more horsepower, do they put fans on the exhaust? No! They inject more air into the engine so it can breathe. And when they want the freshest, coolest air, what do they do? They cut the hood and let the blower breathe in all they can, or they add hood scoops. You need to do pretty much the same thing.