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Parallel config suddenly destroyed my Tri-SLI temps

post #1 of 25
Thread Starter 
A few days ago, I ran three 580s on XPSC blocks using Bitspower bridges in serial. For the ten minutes I ran Heaven benchmarks, the temps were beautifully in synch. I say 10 minutes because one of the blocks turned out to be cursed and shorted out my third card, and eventually a fourth.

Anyway, fast forward to today. Install new block on new card, replace a couple broken "high flow" Koolance QDCs with working "extreme flow" QDCs and the Bitspower bridges with Koolance Dual VID bridges.

That's all I changed. And yet, my temps have gone to utter **** on my middle card. 14C higher than the top card. So my temps are like this: 44c, 56c, 41c, running stock in Heaven.

Obviously it's not restriction, otherwise card 3 temps would be even worse. But obviously it IS restriction, otherwise my second video card wouldn't be getting starved of water and apparently bypassed. As you can see, that makes no ******* sense.

Why is everything with WC such a pain in the ass, sigh.
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post #2 of 25
I would shuffle the cards and see if the same card is still hotter..this will give you better idea what's is up
    
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post #3 of 25
Thread Starter 
Yup, the cause is parallel. In serial, I'm getting 45/46/44c. So at least at stock GPU settings, going serial doesn't even drop my temps even though I'm using three blocks, a CPU, and two rads with a single MCP-655 (no idea what its variable speed setting is because it was one of those models with the ghetto speed controls that made no sense).

So, beware I guess, minute changes in your setup can randomly mess up your parallel config. Again, all I did was switch out Bitspower plugs for Koolance Dual VIDs, and (less likely to be the issue) Koolance high-flow QDCs for extreme-flow QDCs.

The Koolance bridges are definitely narrow than those Bitspower plugs, but the adjustibility makes them ace
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post #4 of 25
Pics would certainly help.
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post #5 of 25
matrices, would you recommend the XPSC blocks for 580's? You said one shorted out your card? I was looking to cool my tri setup with these since the price was really good (compared to other offerings). Also do you know if you can use the EVGA backplates with these? I know the Koolance blocks allow you to.
post #6 of 25
Thread Starter 
Quote:
Originally Posted by Cheeba-Ace View Post
matrices, would you recommend the XPSC blocks for 580's? You said one shorted out your card? I was looking to cool my tri setup with these since the price was really good (compared to other offerings). Also do you know if you can use the EVGA backplates with these? I know the Koolance blocks allow you to.
The defective block could have been a freak thing, XPSC after all is a reputable WC company. The blocks still have an annoying problem, though, which is the slight protrusion on the inlets and outlets. This means two things: one, if you use non-adjustable SLI WC fittings, you might be able to still plug in your cards but they won't line up with a rigid SLI bridge; two, if you want to really tighten your fittings on the inlet/outlet, you need to use a wrench to hold the other side of the inlet/outlet in place.

They're also not much to look at, since all you see in these damn cases are the side of the blocks, which is a dull copper.

No idea about the EVGA backplates. They don't look impressive to me anyway to be honest, only the EK backplates are truly nice to look at. I might just slap one on the top block for looks with a little double-sided adhesive foam.
Edited by matrices - 8/9/11 at 11:04am
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post #7 of 25
If your having trouble with parallel it is most likely due to low flow.
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post #8 of 25
Thread Starter 
Quote:
Originally Posted by theseekeroffun View Post
If your having trouble with parallel it is most likely due to low flow.
Well there's the paradox: parallel was fine with Bitspower SLI fittings. I switched to narrow Koolance SLI fittings and suddenly the middle block was starved. But if it's a matter of flow, why was the third card doing fine with temps?

In other words, isn't flow measured against restriction, and if there's restriction, shouldn't temps for the third card have been even worse than the second?

Basically I don't understand why it happened.
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post #9 of 25
yep, you have to at least drop tubing size when going parallel. You lose all kinds of pressure. Serial is ALWAYS the way to go. Either go serial or entirely separate loops. You won't get significantly cooler water and the pressure drop is just murder
    
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post #10 of 25
Thread Starter 
I don't think there are any hard and fast rules. It's not at all clear to me what's causing what and I don't think most people are reading the full OP.

To break it down:

1. Parallel worked fine using Bitspower SLI fittings in my loop.

2. Then it worked terribly using narrower Koolance SLI fittings.

Doesn't make sense to me.
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