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Old 03-08-11, 10:42 AM   #13
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Default Re: Official Radeon HD 6990 reviews

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

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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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Old 03-08-11, 11:59 AM   #14
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Default Re: Official Radeon HD 6990 reviews

I have a question. I was told that when you CrossFireX/SLI multiple graphics cards, the VRAM is not added together. Meaning, if you CrossFireX two HD 6970 2GB cards together, you won't get 4GB of VRAM...it stays "separate." How come the HD 6990 is advertised as a 4GB card? Isn't it basically two HD 6970 2GB GPUs together? Shouldn't it still be a 2GB card?
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Old 03-08-11, 12:07 PM   #15
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Default Re: Official Radeon HD 6990 reviews

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I have a question. I was told that when you CrossFireX/SLI multiple graphics cards, the VRAM is not added together. Meaning, if you CrossFireX two HD 6970 2GB cards together, you won't get 4GB of VRAM...it stays "separate." How come the HD 6990 is advertised as a 4GB card? Isn't it basically two HD 6970 2GB GPUs together? Shouldn't it still be a 2GB card?
To the best of my knowledge you are correct. The 4GB is little more than marketing.
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Old 03-08-11, 12:55 PM   #16
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Default Re: Official Radeon HD 6990 reviews

Dat price... ouch

http://www.newegg.com/Product/Produc...-529-_-Product
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Old 03-08-11, 04:53 PM   #17
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Default Re: Official Radeon HD 6990 reviews

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590 launches it'll come down...keep your pants on fellas.
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Old 03-08-11, 05:21 PM   #18
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Default Re: Official Radeon HD 6990 reviews

Heat and noise are horrible.

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Old 03-08-11, 06:03 PM   #19
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Default Re: Official Radeon HD 6990 reviews

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Heat and noise are horrible.

Someone should ask him if he likes the cooler...
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Old 03-08-11, 08:54 PM   #20
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Default Re: Official Radeon HD 6990 reviews

LOL fail.
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Old 03-08-11, 09:47 PM   #21
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Default Re: Official Radeon HD 6990 reviews

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Someone should ask him if he likes the cooler...
LOL

I was thinking the guy never stops. Plus nothing to compare to in that lousy review.
Is the cooler noisy, sure it is but the open test bench just makes it even more noisy. I don't think AMD could have got better air cooler on such powerful card and keep it 2 slots at the same time.

I don't think there is any problem with the heat at least not compared to other powerful set ups. The load temps are just about the same as GTX 570 SLI, GTX 580 SLI and much lower than GTX 480 and HD 4870x2.

If that genius reviewer wanted to cook something on the card he should have used at least GTX 480.



Here ONLY the OC HD 6990 is much more noisy than GTX 580 SLI. Both picture are from AnandTech HD 6990 reviews



Based on the above I don't think the rumored GTX 590 is going to run cooler or more quiet provided it's going to be as powerful as the HD 6990 and and use just 2 slots.
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Old 03-08-11, 09:57 PM   #22
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Default Re: Official Radeon HD 6990 reviews

Heinze, decibels are on a logarithmic scale, so the difference in sound is a lot more than it seems.
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Old 03-08-11, 10:18 PM   #23
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Default Re: Official Radeon HD 6990 reviews

@ Sazar, thanks for the info.
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Old 03-08-11, 10:22 PM   #24
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Default Re: Official Radeon HD 6990 reviews

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Originally Posted by slaWter View Post
Quad Crossfire. That's what this card is all about.

A Quad Crossfire setup might be trickier to get up and running as it might seem though. As I suspected last week, this cooler indeed needs quite a bit of breathing room. Just like the crap cooler on the Palits.

Overall it's a great card for sure and with the right PCIe layout, Quad Crossfire shouldn't be an issue. Definitely easier than Tri-SLI with my Palits

The difference between the two speed modes is minimal though. That just shows that overclocking graphics cards is pointless once you're using a Multi-GPU setup.
Not a problem with water cooling.
The 3GB 580 is very tempting but too bad nobody is willing to make a full cover water block for it, so out of the question for me.
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