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Help with 6870 CrossfireX

blacblu

blacblu

blacblu

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Joined
4 Apr 2011
Posts
259
I will tell something that is happening to me and I just diagnosticated and also don't even know how to explain. Like I said I have 2 XFX HD 6870s, I will call them 6870_1 (Master) and 6870_2(slave), so no one will get confused or misread anything.

A week ago, the cooler of the 6870_2 was failing, so I bought another one, an Accelero Twin Turbo Pro, which arrived today. I installed it and so far so good, at least apparently.

First thing after boot, I ran Heaven 2.5 and RealTemp 3.70(was working before), after it was over I went to check the temperatures of my cards and the 6870_2(new cooler) hit 57ºC max, but the 6870_1, which was not modified at all hit 84ºC max.

I really don't know how this kind of thing is possible? Does anyone have any logical explanation and/or solution?
 
The new cooler on 6870_2 will cause the warm air to go to 6870_1. You could stick a fan to direct some air to 6870_1's cooler to see if it helps.

On the other hand, the temps seems fine. Nothing to worry about really.
 
Temps do seem OK. The better cooler would be best placed on the card above the other in your xfire set up. As mentioned with heat rising it will always be the hotter card as the lower emits heat straight onto the upper. My 5870's were the same. Putting my 7950's underwater completely solved the problem though :D
 
In CrossFire, the top gpu is always the warmest, as suggested above, put the AC in the top slot.

I presume you hooked up the AC fan directly onto the gpu pcb, if so, you can manually set the fan speed to about 60-70% when in game to keep the top gpu nice and cool.
 
Having a fan on the side-panel as exhaust (if your case can mount) would helps as well, as the heat from the bottom card will get sucked out of the case, rather than going to the card above it.
 
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might be worth replacing the thermal paste on your older card, being as the new cooler will have had new stuff on it.

not saying it will affect the temps, just worth a clean :).
 
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