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Does spacing your SLI setup help at all? - Page 3

post #21 of 32
Thread Starter 
OK well I did figure something out. I added a 140mm quiet fan on the side panel. That took the top card load temps from 85 to 70. So the heat and noise went down. But the problem is, the 140mm fan rubs against the side panel causing a really annoying HUM. It looks like the spinning blade is hitting the panel. But that is the only way to get it to push air in. I looked at my other fans and they would be the same thing. How the heck do people mount side fans as an intake if these fans are designed as outtakes?
post #22 of 32
Quote:
Originally Posted by Elvandar View Post

It's actually more like 0.001% like my video proves. Meaning no difference at all.

I didn't watch your video, but did you run any both highly GPU and CPU-intensive tests? Crysis, GTAIV, that kind of thing? Those are the kinda tests where a lowering of bandwidth is more likely to make a difference.
Quote:
Originally Posted by d-block View Post

It makes a HUGE difference temp wise. If you are running a couple heaters like the 470s it can be a 15 C drop just from adding one slot of spacing.

470's and 480's are BY FAR the cards that need the spacing the most ... Having 2 spaces vs. 0 spaces on these cards makes like a 8C difference on the bottom card, and a 15C difference on the top card (assuming a normal oriented case). At least it did in my old Sniper.
Edited by brettjv - 1/8/12 at 12:25pm
    
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post #23 of 32
No, the video was just 3dmark11.
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post #24 of 32
Quote:
Originally Posted by falcon26 View Post

OK well I did figure something out. I added a 140mm quiet fan on the side panel. That took the top card load temps from 85 to 70. So the heat and noise went down. But the problem is, the 140mm fan rubs against the side panel causing a really annoying HUM. It looks like the spinning blade is hitting the panel. But that is the only way to get it to push air in. I looked at my other fans and they would be the same thing. How the heck do people mount side fans as an intake if these fans are designed as outtakes?

Get something like these rubber fan rivets. Rubber fan mounts are awesome and they'll reduce noise and vibration as well as improve airflow by taking the fan directly off the grille. You actually might be able to buy them at your local computer store (CompUSA, Fry's or definitely MicroCenter if there's one near you)
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post #25 of 32
Thread Starter 
OK I've given up on the side fan for now. I did add 1 top exhaust 120mm fan. Do top fans help at all?
post #26 of 32
Like other's have already mentioned, with no space you'll find your cards (especially the top one) running ~10-15 degrees warmer/hotter than if there was a slot or even two between them. I tried it with my setup; moved the CUII to the top and Lightning to the bottom which left no space for the CUII to get air .. temps rose as expected.

Since then I've solved it with WC but much cheaper way is just to get a mobo with enough space and 2 slot cards.

add: or have it as I had it before .. the 2 slot card on the top and 3 slot card on the bottom, worked just fine.
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post #27 of 32
Thread Starter 
Yeah that is the next step. But what I have noticed is, if I do get another motherboard and get the spacing on the slots, I then will lose my xfi hd sound card and will have to revert to on board sound, which I've heard really sucks. Although I would only need it for games really..
post #28 of 32
Thread Starter 
Also having spaced the cards how much of a temp drop is their really? I mean if it loads now at 80 I don't want to buy another motherboard for $200 to get an extra space or two and only have my temps drop from 80 to say 75, big deal. Ideally I would like the top card to come close to the bottom card which is at 65 degrees. Would spacing the cards drop it that much?
post #29 of 32
I actually ran into the same problem a while ago with my P67 and two 460's. I fold so my cards are under full load pretty much all the time:

Two cards right next to each other 100% fan speed: top card ~80-85, bottom card 70-75. It got to the point where my top card just failed and I had to send it in to get fixed.

Two cards spaced out properly with 50% fan speed: top card ~58, bottom card ~54-55. Ended up buying a pci-extender cord for my Essence STX. Worked like a charm.
post #30 of 32
Quote:
Originally Posted by BababooeyHTJ View Post

I don't know about you but I don't play 3d mark. In a review I actually skip right over 3d mark results. They don't translate over to real world performance.
It has actually been proven that it can make a difference.
Now a 7970, especially in gpgpu can easily saturate a pci-e 2.0 slot at 8x speeds.

-that review is 2 years old

-the review says 1%-8% difference, 62fps vs 63fps, etc
Edited by Elvandar - 1/9/12 at 9:13am
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