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Old 03-08-11, 10:42 AM   #13
mullet
 
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Join Date: Oct 2005
Posts: 8,062
Default Re: Official Radeon HD 6990 reviews

LOL, you guys better have damn good case ventilation & ear muffs.

Quote:
To make a point, we quickly took the temperatures of a 500GB Seagate hard drive in our GPU test rig when placed in the drive cage directly behind the 6990 in PEG slot 1. As a result the 6990 is directly blowing on the hard drive. Note here that normally we have a low-speed 120mm fan directly behind PEG 1, which we have to remove to make room for the 5970 and 6990. All of these tests were run with Crysis in a loop – so they aren’t the highest possible values we could achieve.

At default clocks for the 6990 our hard drive temperature is 37C, while overclocked this reaches 40C. Meanwhile if we replace the 6990 with the 5970, this drops to 31C. Replace that with a pair of 6970s in Crossfire and our 120mm fan, and that drops even more to 27C. So the penalty for having a dual-exhaust card like the 6990 as far as our setup is concerned is 6C compared to a long directed card like the 5970, and 10C compared to a pair of shorter 6970s and an additional case fan. The ultimate purpose of this exercise is to illustrate how placing a hard drive (or any other component) behind the 6990 is a poor choice. As many cases do have hard drive bays around this location, you’d be best served putting your drives as far away from a 6990 as possible.

And while we haven’t been able to test this, as far as air overclocking is concerned the best step may to take this one step further and turn the closest air intake in to an exhaust. A number of cases keep an intake at the front of the case roughly in-line with PEG slot 1; turning this in to an exhaust would much more effectively dissipate the heat that the 6990 is throwing in to the case, and this may be what AMD was going for all along. Video cards that vent air out of the front and the rear of the case, anyone?

Ultimately the 6990 is a doozy, the likes of which we haven’t seen before. Between its greater power consumption and its dual-exhaust cooler, it requires a greater attention to cooling than any other dual-GPU card. Or to put this another way, it’s much more of a specialized card than the 5970 was.
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