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Sandwiching (Less than half a slot) is okay?

post #1 of 10
Thread Starter 
Hi OC.net, I got a Asus HD 7950 TOP V2 which is 2.5 Slots. I'm thinking of adding a second one for crossfire goodness (And it'll look beast too, since I'll be buying some ROG Crossfire cables), and I was wondering whether half a slot between each other was enough to cool these two beasts. Most of you would say "no", but I just want to say this. There is basically no temp difference from 30% fan speed and 100% fan speed (The fans do noticeably spin faster), and I actually think this happens because the heatsink is so effective that you can't really get lower temps without lowering the ambient. Ie, with 30% fan speed I hit a max of 67 degrees celcius, while with 100% I get 66 degrees. So this makes me feel that the effectiveness of the large heatsink isn't being put to use, thus by adding a second card it'll allow me to utilise the heatsink.. if that makes sense to any of you.

What do you guys think? Is this a good idea or bad idea?
post #2 of 10
Quote:
Originally Posted by JJ1217 View Post

Hi OC.net, I got a Asus HD 7950 TOP V2 which is 2.5 Slots. I'm thinking of adding a second one for crossfire goodness (And it'll look beast too, since I'll be buying some ROG Crossfire cables), and I was wondering whether half a slot between each other was enough to cool these two beasts. Most of you would say "no", but I just want to say this. There is basically no temp difference from 30% fan speed and 100% fan speed (The fans do noticeably spin faster), and I actually think this happens because the heatsink is so effective that you can't really get lower temps without lowering the ambient. Ie, with 30% fan speed I hit a max of 67 degrees celcius, while with 100% I get 66 degrees. So this makes me feel that the effectiveness of the large heatsink isn't being put to use, thus by adding a second card it'll allow me to utilise the heatsink.. if that makes sense to any of you.

What do you guys think? Is this a good idea or bad idea?

You will be fine. I used to have no space at all between my crossfired cards (with stock cooling), and they never had a problem from it.
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by Crazy9000 View Post

You will be fine. I used to have no space at all between my crossfired cards (with stock cooling), and they never had a problem from it.

Okay, thanks! But does my rambling about the no temp difference between 30% and 100% make any sense to you? It seems to make sense to me, but I could be definitely wrong. I actually got a thermometer and the part of the huge heatsink closer to the GPU is around 60-65 degrees, while off to the far right of the heatsink and far left its around 45... which to me only seems to prove my "theory"..
post #4 of 10
I think it's fairly unlikely you would be at that point on air cooling. Remember water cooling can only cool to ambient temps as well. It could just be that the airflow over the cooler provides as much cooling as it can at 30% speed, so increasing fan speed doesn't make much difference.
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post #5 of 10
Thread Starter 
Okay, thanks!
post #6 of 10
Quote:
Originally Posted by JJ1217 View Post

Okay, thanks! But does my rambling about the no temp difference between 30% and 100% make any sense to you? It seems to make sense to me, but I could be definitely wrong. I actually got a thermometer and the part of the huge heatsink closer to the GPU is around 60-65 degrees, while off to the far right of the heatsink and far left its around 45... which to me only seems to prove my "theory"..

Or the heat sinks are crap or the air flow is restricted somewhere or the fan is pulling hot air into the fan again if the exhaust isn't ducted away.

Theoretically you can cool to just above ambient with a large enough heat sink and adequate air flow. Thermodynamics say its so but practicality probably says not!
 
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post #7 of 10
Thread Starter 
I thought that too, until I realised there are temp differences if I overclock. If its at stock, there is barely a change, while if I overclock, there is a change of around 10 degrees. (This is going from 900/1250 @ 1.000V to 1200/1600 @ 1.275 V)

Last week I bought some MX-4, intended to change my GPU thermal paste, but I chose not to do it. Today, feeling braver, I attempted to change it, and I did it. I'm now getting 58 degrees under load, which is crazy to me. So much quieter. Definitely going to go for a second card now, that 10 degree lower temps really changed my mind. Very very happy at the moment.
post #8 of 10
Thread Starter 
fail post.
post #9 of 10
Quote:
Originally Posted by Crazy9000 View Post

I think it's fairly unlikely you would be at that point on air cooling. Remember water cooling can only cool to ambient temps as well. It could just be that the airflow over the cooler provides as much cooling as it can at 30% speed, so increasing fan speed doesn't make much difference.


You ~can~ cool below ambient temps with water, It's just complicated and likely to have alot of problems, The use of TECs/Waterchillers is needed and well yeah you see where i'm going.
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post #10 of 10
Quote:
Originally Posted by Rayleyne View Post

You ~can~ cool below ambient temps with water, It's just complicated and likely to have alot of problems, The use of TECs/Waterchillers is needed and well yeah you see where i'm going.

Well I wouldn't call that plain watercoolong anymore.
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