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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 173

post #1721 of 37758
To all 7970CFX on AIR owners,

How hot does your top card run and what are the fan speeds?

My single 7970 runs max 80c with a low fan speed of 35%, when I ramp it up to 40% it'll be down to 70c @ 1125/1575 @ 1.075mv. I don't know why, which is totally unnecessary, but I want a second 7970. I am wondering how much increase in temp my top card will run. I have about an inch between CF configuration in my Gigabyte Z68XP-UD4 in a Corsair 650D case. I do not plan to get the side mesh. I know I won't be able to keep fan speed at 35% if I CF, so I'd probably need to ramp it up to 40%.

If right now I am looking at 70c, then in CF, the top card would be 75c?
post #1722 of 37758
Quote:
Originally Posted by WiL11o6 View Post

To all 7970CFX on AIR owners,
How hot does your top card run and what are the fan speeds?
My single 7970 runs max 80c with a low fan speed of 35%, when I ramp it up to 40% it'll be down to 70c @ 1125/1575 @ 1.075mv. I don't know why, which is totally unnecessary, but I want a second 7970. I am wondering how much increase in temp my top card will run. I have about an inch between CF configuration in my Gigabyte Z68XP-UD4 in a Corsair 650D case. I do not plan to get the side mesh. I know I won't be able to keep fan speed at 35% if I CF, so I'd probably need to ramp it up to 40%.
If right now I am looking at 70c, then in CF, the top card would be 75c?

Its about 10c hotter. Mine runs around 75c in BF3 after some hours. This is with custom fan profile. So its about 40-60% fan speed on top card. Second is obviously /care about cause it runs alot cooler anyway
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post #1723 of 37758
Whats with these percentage numbers pople are posting? Any1 up for sharing? tongue.gif
post #1724 of 37758
Quote:
Originally Posted by Norlig View Post

Whats with these percentage numbers pople are posting? Any1 up for sharing? tongue.gif

Clif-notes version is that it's the ASIC quality number of your board. The higher the quality % number, the better *supposedly*. The sweet spot seems to be somewhere in the middle as far as higher clocks go (76-84% ASIC quality).
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post #1725 of 37758
Quote:
Originally Posted by Norlig View Post

Whats with these percentage numbers pople are posting? Any1 up for sharing? tongue.gif

It's your cards cool factor. tongue.gif




Actually, it's the 'ASIC quality'. Download GPUZ 0.5.8 and the system menu has a option to display ASIC quality. Or you could use the /rr174 argument for AB.
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post #1726 of 37758
Thanks,

Could I set custom fan profile for individual cards? Say 40% top card and 35% bottom card fan speed.

Edit: I Just placed an order for another 7970, lol. I sort of missed having constant 60+fps on my SLI 570s minus the really, really unplayable microstutter which is what made me sell them. This single 7970 is surely a beast, but it does dip into the 40s-50s at times in Karkand maps. So I said what the hell, ordered another one, hopefully I won't get future driver CFX issues because my 570s were pretty smooth with NVIDIA drivers.

Do I need CFX drivers for AMD cards? Because for NVIDIA, all I needed to do was plug in the second card, and enable SLI. But I read all these AMD CAP profiles? What are those? Separate drivers for CFX?
Edited by WiL11o6 - 1/23/12 at 1:31pm
post #1727 of 37758
Quote:
Originally Posted by Norlig View Post

Whats with these percentage numbers pople are posting? Any1 up for sharing? tongue.gif

AMD uses the following table to select VID depending on ASIC quality:

up to 2F90 (up to 75% quality) - 1.1750V
up to 34D0 (up to 80% quality) - 1.1125V
up to 3820 (up to 85% quality) - 1.0500V
up to 3A90 (up to 90% quality) - 1.0250V


The higher the ASIC quality, the lower stock voltage your card has. So far it seems the low VID cards OC better, BUT can't increase voltage without crashing after a certain point. By that reasoning you're better off if you have a card that happens to end up near one of the numbers above, like a 75% quality chip that is the highest leakage that still gets accepted to 1,175V and can overvolt to full 1,3V.
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post #1728 of 37758
Quote:
Originally Posted by evensen007 View Post

Clif-notes version is that it's the ASIC quality number of your board. The higher the quality % number, the better *supposedly*. The sweet spot seems to be somewhere in the middle as far as higher clocks go (76-84% ASIC quality).
Quote:
Originally Posted by wTheOnew View Post

It's your cards cool factor. tongue.gif
Actually, it's the 'ASIC quality'. Download GPUZ 0.5.8 and the system menu has a option to display ASIC quality. Or you could use the /rr174 argument for AB.

Aahh! Cool! Thanks smile.gif
post #1729 of 37758
Update (2012.01.23): the ASIC quality detection is probably based on the GPU voltage. Here what AMD’s Dave Baumann says:
Actually, it does the opposite! We scale the voltage based on leakage, so the higher leakage parts use lower voltage and the lower leakage parts use a higher voltage – what this is does narrow the entire TDP range of the product.

Everything is qualified at worst case anyway; all the TDP calcs and the fan settings are completed on the wors case for the product range.
http://www.geeks3d.com/20120122/test-asic-quality-of-geforce-gpus/
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post #1730 of 37758
Quote:
Originally Posted by WiL11o6 View Post

To all 7970CFX on AIR owners,
How hot does your top card run and what are the fan speeds?
My single 7970 runs max 80c with a low fan speed of 35%, when I ramp it up to 40% it'll be down to 70c @ 1125/1575 @ 1.075mv. I don't know why, which is totally unnecessary, but I want a second 7970. I am wondering how much increase in temp my top card will run. I have about an inch between CF configuration in my Gigabyte Z68XP-UD4 in a Corsair 650D case. I do not plan to get the side mesh. I know I won't be able to keep fan speed at 35% if I CF, so I'd probably need to ramp it up to 40%.
If right now I am looking at 70c, then in CF, the top card would be 75c?

I get about a 10c difference also, but I'm on a bench right now with two slots in between. I don't like having the cards on top of one another on stock cooling. When I get my blocks I can really take them for a spin.

I haven't seen an option to run separate fan profiles on afterburner but I'm pretty lazy and usually just set the fans to 35% or whatever I can tolerate in terms of noise. I keep an eye on the temps to be sure. Once my blocks come I won't even worry about it. Patience is a *****.
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