Topic Title: 7950 Crossfire 2nd fan always 100%
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Created On: 09/04/2014 02:40 PM
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 09/04/2014 02:40 PM
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NightOwl71
Peon

Posts: 4
Joined: 09/04/2014

I recently acquired 2 HIS 7950 IceQ Turbos, and I have them setup in Crossfire configuration. The second card's fan is always stuck at 100%, though MSI Afterburner reports it at a lower percentage. It's much louder and the airflow is much higher than the first card. Afterburner seems to be reporting the fan's tachometer correctly. (it's stuck at roughly 3200 rpm regardless of the %)

The main issue is noise at this point, and it's been bothering me and my roommates enough that I'd like to try and figure it out. Any help would be appreciated.

ULPS is disabled, because I had the 100% usage problem with it. Otherwise I'm just using Afterburner for the fan speeds, which works correctly for the first card. I'm currently on the 14.7 beta drivers. Nothing is overclocked.

When ULPS is on the card powers down correctly, and when the card powers up the fan is always at 100%. So the behavior seems the same: if the 2nd card is on, the fan is at full power.

System specs:
Windows 8.1 Pro 64 bit
GA-Z97-UD5H Mobo
i7 4790k
4 x Gskill Ripjaws X 1600 8GB
Corsair AX760

 09/11/2014 05:18 PM
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NightOwl71
Peon

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Joined: 09/04/2014

Any ideas at all?  This is very strange and I can't figure it out.  I was hoping someone in the AMD forums would have heard about this kind of thing before or give me a lead to go on.

 09/11/2014 06:04 PM
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black_zion
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If you acquired these second hand on ebay, there is the distinct possibility someone used them for bitcoin mining and flashed a custom BIOS to it.

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AMD FX-8350 w/ Corsair H105, ASUS Sabertooth 990FX Gen3/R2, 8GiB G.SKILL DDR3-2133, XFX HD 7970, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, Corsair C70, HP ZR2440w, Win 7 Ultimate x64
 09/12/2014 11:00 AM
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NightOwl71
Peon

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Good thought!  That didn't occur to me before that the BIOS could have been flashed.  Then I remembered that these cards have a BIOS switch, so I switched them over to the 2nd BIOS, which is the factory protected default.

Unfortunately, still no change in behavior.  Any other ideas to try?

 09/12/2014 11:07 AM
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black_zion
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Swap the cards around and see if the same behavior occurs. Also did you check the box to synchronize settings for similar graphics processors in MSI Afterburner?

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AMD FX-8350 w/ Corsair H105, ASUS Sabertooth 990FX Gen3/R2, 8GiB G.SKILL DDR3-2133, XFX HD 7970, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, Corsair C70, HP ZR2440w, Win 7 Ultimate x64
 09/12/2014 11:35 AM
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NightOwl71
Peon

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Joined: 09/04/2014

OK, it's done and cards are now swapped.  I do have "synchronize settings" checked in AB.

It seems the one card always has the fan going full blast.  Even in the first slot it is reading incorrectly at 30% with the correct tachometer of ~3220.

I've always assumed this was a software issue, but I'm thinking now maybe it's a fan problem on the card.  I noticed when I was swapping them the fan is a 4 pin.  Perhaps the PWM pin is out on the header or cable and it's operating without it?

 09/12/2014 11:40 AM
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black_zion
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Some defect at the hardware level.

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AMD FX-8350 w/ Corsair H105, ASUS Sabertooth 990FX Gen3/R2, 8GiB G.SKILL DDR3-2133, XFX HD 7970, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, Corsair C70, HP ZR2440w, Win 7 Ultimate x64
 09/12/2014 10:34 PM
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Thanny
Alpha Geek

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Disconnecting the fan and powering it separately to test its functionality is a decent idea, if you can figure out how to do it (easier to do if you have a standard 4-pin header to sacrifice for test leads).

 

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