FAN PROBLEM MAYBE?? SAPPHIRE HD 7950 3GB GDDR5 Dual X with Boost

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LaMuerte

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Nov 16, 2013
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Hi Guys,

I bought the card mentioned above. I noticed that 1 of the fan (lets call her fan-A fan close to the port)is not working. The seller said that the fan-A will only spin if the GPU goes to a certain temperature..


So, I am asking you guys who have this kind of card from the beginning.. Does the two fan work out of the box??

Thank you very much!
 
Solution
M
The Sapphire 7950 Dual-X cards do not have Sapphire's "intelligent fan control" feature using a single card.
Both fans on the card should spin all the time.

The only Sapphire Card that uses intelligent fan control to turn off UN-needed fans at idle is the Vapor-X which runs just one of its 3 fans at idle if you have the intelligent fan control switch enabled.

Now if you were running crossfire...then sure, ULPS would kick in and turn off the second GPU completely when not in use.

But with a single Sapphire 7950 Dual-X , both of the fans should spin all the time.
How do I know for sure? Because I own two of these cards.
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LaMuerte

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yep, the fan on the graphics card

not the actual pic though..

http://


thanks BTW.

 
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woworwow

woworwow

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OK. Is both of them not spinning or just one?
Can you run games without the fan spinning?
It's a new feature called AMD zero core which turns off the GPU when you're not doing anything.
But that feature is supported only on R series GPU, maybe sapphire made their own similiar feature
 
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LaMuerte

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only fan-A is not spinning. and yes i can run games even though fan-A is not spinning..
I was hoping people with this kind of card could help me..

what do you mean by turning of the gpu?? not familiar with that GPU technology.

 
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woworwow

woworwow

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Well ok so it's not what i said. The card is fine it's just a power saving feature made by sapphire. If you want to turn it on, you can use AMD OverDrive, set the fans to manual, then max it out on 100% speed, see if it spins, if it doesn't then replace it
 
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mtdew332

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The Sapphire 7950 Dual-X cards do not have Sapphire's "intelligent fan control" feature using a single card.
Both fans on the card should spin all the time.

The only Sapphire Card that uses intelligent fan control to turn off UN-needed fans at idle is the Vapor-X which runs just one of its 3 fans at idle if you have the intelligent fan control switch enabled.

Now if you were running crossfire...then sure, ULPS would kick in and turn off the second GPU completely when not in use.

But with a single Sapphire 7950 Dual-X , both of the fans should spin all the time.
How do I know for sure? Because I own two of these cards.
 
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Solution
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mtdew332

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Zero core and intelligent fan control are two different things.
Zero core is AMDs own power saving feature that is used with all AMD CGN GPUs.

Zero core doesn't shut down just one of the fans on a single 7950 Dual-x at all.

If using a single GPU and the pc goes into a low power state, then zero core will put the GPU into ULPS and turn off both fans.

But when the GPU is active (being used), both fans should spin.

The description that was given in the OP, about only one fan spinning and the other fan only kicking in when the GPU reaches a certain temperature, is what Sapphires "intelligent fan control" does.
And the Sapphire 7950 Dual-X doesn't use this feature.

note: (just for clarity) ULPS stands for Ultra Low Power State

 
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woworwow

woworwow

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Well ok.
But as i said in my post, are you sure you don't have any updates that you missed or maybe he somehow enabled this feature on his card by 3rd party software or just plain messing around with the settings
 
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mtdew332

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Its not possible.
Both fans on a Sapphire 7950 Dual-X are powered together using the same header.
If the fans are being controlled by software, it would affect both fans the same.

The actual card would have to have been modded with aftermarket fans that are powered/controlled separate.
 
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mtdew332

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He never said it was modded and posted a pic of one completely stock with the Sapphire Dual-X cooler.

Its ok though, its clear you're just one of those who feels its an argument and you have to win.
YOU WIN!
Tell the guy whatever you want, don't bother giving him accurate info just so you can be right....even if it doesn't actually help him with his issue.

 
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mtdew332

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Seriously, he would know if it was modded to have both fans controlled separately.
Because the Dual-X's PCB only has one fan header on it.

In order to have only one fan controlled by temp and the other not, it would have to have each fan on its own power source.
So he'd have a power cable coming from one of the fans that he would have to hook up manually to a separate power source other than the single one available on the PCB.
Even then, that power source would have to be something like a motherboard fan header to be able to control its RPMs to scale with temperature.

Its the only way to control the fans power/rpms separately....to have separate power sources.

Of course...you "theoretically" could solder one of fans wires to a separate power source on the card...but its highly unlikely since then the fan wouldn't be able to control its RPMs at all and would run at the same speed regardless of temps or 2D mode vs 3D mode....which would not be good...and would be some very bad modding.

Maybe this will help..HERE IS A PIC...see how the fans are joined together to use a single fan header.... that's why their RPMs are unable to be controlled separately on a stock Sapphire Dual-X...since the Dual-X only has one fan header.
 
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mtdew332

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Its very easy on these cards, the Fan shroud comes right off and is very easy to separate from the heat-sink, so no need to remove heat-sink like you'd have to on some GPUs.
Then you just measure the fans to be sure you get the right size and do a search for replacement 7950 Dual-X fans.
BE SURE you get the right size since some models use different sizes.

My Sapphire R9 290 Tri-X's fan shroud is the same way.
The shroud is very easy to get off if It ever needs a fan replacement.
I really like Sapphires aftermarket fan shroud designs in that respect... since it doesn't void the warranty just replacing a fan.
 
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LaMuerte

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Thank you woworwow and mtdew332, you've been both very helpful..
The card has'nt been modded FYI.


I guess i will return the card.

Seriously, appreciate the help from you guys. Cheers!
 
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mtdew332

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LaMuerte,
That's great that you at least got your answer.
BTW: If that card has Hynix memory and you're an overclocker, I'd think twice before exchanging it and just grab a new fan for it, because its worth the extra few $$ you'll spend.
In case you don't know Hynix memory overclocks way better than Elpida memory on those cards.

And if your next question is...
How do I know what memory it has?
Download GPU-Z and run it....then look in the Memory Type box and it will tell you.
 
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mtdew332

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And just to be clear for future reference for everyone.

The reason I know its not supposed to be like this is because both fans on this card plug into the same power header on the PCB.

A fans RPMs are controlled by voltage.
Lower voltage = Lower RPMs.
Higher voltage = Higher RPMs.

So if both fans are the same and use the same power source, then they are subject to the same voltage changes and the same RPMs at any given temperature or voltage change.
(Give or take a few RPMs between the two of course depending on tolerances.)
 
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