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6870s Crossfire, other card too loud

post #1 of 4
Thread Starter 
Hey,

I just bought my 2nd 6870 a few days ago (both are DirectCu) and while it can run the card sufficiently cool it's nothing too pleasant for the ears. I'm looking for ways to lessen the heat that the other card has to suffer due to its placement.

I have two ideas, hoping if you guys could say which would be better or if you have better ideas yourself be sure to tell em

A) underclock & undervolt the other card and overclock the other one a bit so temperatures & fan usage match. Obviously there ought to be more reduction in performance but a little drop won't matter much to me. The cards are running 1.20v during load (seems higher than necessary?).

B) buy aftermarket cooling solution for the card in pain.

Rig is in the sig, case has 5 fans, 2 intake front, 1 outtake gpu side (noctua 12 flx), 1 outtake back and 1.. intake or outtake top behind the cpu cooler (comes with the case anyhow).

Here's a screenshot. Despite afterburner claiming them to be gpu1 and gpu2 I'd still have the benefit of doubt whether those match to their physical locations. There's 1 slot in between the cards.



Also if you guys have any idea what's up with the different idle speeds and the fact that gpu-z doesn't show crossfire to be enabled on the other card I'd be very grateful. The cards do actually work in crossfire though so that's not too big of a concern.
Patchwork Pawn
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Patchwork Pawn
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post #2 of 4
for future reference outtake = exhaust, its easier to understand that way.

the top fan is exhaust, assuming it is set up stock. if this is the case, you will have negative balance in your case as you have only 2 intake fans and 3 exhaust fans. those side fan ports are designed to be intake I believe.

assuming you are not concerned with sound, I would set it up in the following manner:

2 intake front
1 intake side

2 exhaust top
1 exhaust rear

I am not sure that those side panels are situated well enough that you are going to see increased performance on your gpu temps. if they are mounted directly over the vards or near their intake fans, you should be fine.

what brand of fans are you using? are you sure your front intake ones are bringing in enough air for the GPU's?
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Alienware 15
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post #3 of 4
One of the cards seems to be clocked alot higher than the other, thats probably the one thats getting hotter, making the fan ramp up faster.

300 MHz compared to 100 MHz.

upon further looking at your picture, the card with the higher clock speeds actually has lower temps and fan speed. Strange.

I would pull out one of the cards so you can be certain which card has the higher clock, lower fan speed and which bios it is using.

For the other card, I would suggest removing the cooler and cleaning off the thermal compound and then re-apply some mx-2 or similar high quality thermal paste and possible flash the bios to the same one as the better performing card.

Also, aftering figuring out which card is the better performing card, I would make sure to put the 'cooler' card in the upper position with the 'warmer' card on the bottom so it get more fresh, cool air.
MKG-Cosmos II
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MKG-Cosmos II
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post #4 of 4
Thread Starter 
Quote:
Originally Posted by dutchgenius View Post
for future reference outtake = exhaust, its easier to understand that way.
Yeah, had a bit of a brain freeze there, couldn't come up with the actual word.

Quote:
Originally Posted by dutchgenius View Post
assuming you are not concerned with sound, I would set it up in the following manner:

2 intake front
1 intake side

2 exhaust top
1 exhaust rear
Makes sense with the warm air rising up and all..

Quote:
Originally Posted by dutchgenius View Post
I am not sure that those side panels are situated well enough that you are going to see increased performance on your gpu temps. if they are mounted directly over the vards or near their intake fans, you should be fine.
Yeah the middle section of that side panel fan is actually right where the slot between the two cards is so that should help..

Quote:
Originally Posted by dutchgenius View Post
what brand of fans are you using? are you sure your front intake ones are bringing in enough air for the GPU's
Well actually your post shed some light on what might be the problem. I got the 2 stock cooler master fans (no idea about CFM figures) in front as intake (the other one is attached to the 5.25 bay with steel wire, it was originally the rear exhaust). Rear exhaust is now a noctua NF-P12 because it didn't work as desired as a CPU cooler fan. And as mentioned the top exhaust is stock cooler master as well. I probably should start by making the side fan intake and switching the NF-P12 to front.. Gotta buy some better fans because I definitely think the front intakes aren't giving enough cool.

Quote:
Originally Posted by bob808
One of the cards seems to be clocked alot higher than the other, thats probably the one thats getting hotter, making the fan ramp up faster.

300 MHz compared to 100 MHz.
Sorry for not being clearer, those are the cards idle and I posted those to wonder about their idle speeds being different. Both cards go at 915/1050 when given something to chew on (ignore the 875 etc on the other card, was getting it ready to test some undervolting).

Sound advice to start with, thanks guys!
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