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Completed loop, but CPU (and GPU?) temps way off? - Page 2

post #11 of 22
Thread Starter 
Quote:
Originally Posted by jNSK View Post
When I first set up my loop I was getting loads of around 60 degrees at 1.35v with the bubbles in the reservoir.

Now, a few days later, the reservoir is completely clear (looks good!) and I load at 54 degrees at 1.4v.

Those bubbles really do make a difference, just be patient. Don't do anything, just sit back and wait for them to disappear. Okay maybe not sit back, as it takes a few days, but you get the idea.
Still, looking at H50/70 reviews, it seems like the decision to include CPU block in the loop and add another 360mm was a waste. In the H70 reviews, they all achieve mid 50s temps using just the one 120mm rad it comes with.

How much would CPU temps drop by giving it its own loop vs. one with two video cards? I'm Googling and I can't come across any hard and fast numbers on what kind of temps people get on i5 or i7 on dedicated loops.
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post #12 of 22
Thread Starter 
Quote:
Originally Posted by nckid4u View Post
What's the deal with the two pipes running between your gpus? What is the purpose of that? I would think it to be counterproductive.
Nah, that is actually useful. Parallel multi-GPU config reduces the temperature delta between GPU1 and GPU2. Reduced mine by 2-3C.
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post #13 of 22
Quote:
Originally Posted by matrices View Post
Still, looking at H50/70 reviews, it seems like the decision to include CPU block in the loop and add another 360mm was a waste. In the H70 reviews, they all achieve mid 50s temps using just the one 120mm rad it comes with.

How much would CPU temps drop by giving it its own loop vs. one with two video cards? I'm Googling and I can't come across any hard and fast numbers on what kind of temps people get on i5 or i7 on dedicated loops.
Since you're taking heat from the CPU and cooling it again for the GPU, not much. You wouldn't see much of a difference.
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post #14 of 22
Quote:
Originally Posted by matrices View Post
Nah, that is actually useful. Parallel multi-GPU config reduces the temperature delta between GPU1 and GPU2. Reduced mine by 2-3C.
I cannot imagine how, but I'll take your word for it. Did it go up to decrease the gap or down?
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post #15 of 22
ur cooling 2 gtx 470's thats why the heats higher than you think it should be
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post #16 of 22
Thread Starter 
Quote:
Originally Posted by nckid4u View Post
I cannot imagine how, but I'll take your word for it. Did it go up to decrease the gap or down?
The idea is simple. Some water flows into the second block without getting heated up by the first block. Because of restriction, water nonetheless flows completely through both blocks, so long as outlet is opposite card and opposite side from inlet.

Serial was 6-7C delta. Parallel was 3-4C delta. Another guy on here did the same thing and had even better results (in my case one of the blocks is probably just not as well installed as the other).
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post #17 of 22
Quote:
Originally Posted by matrices View Post
The idea is simple. Some water flows into the second block without getting heated up by the first block. Because of restriction, water nonetheless flows completely through both blocks, so long as outlet is opposite card and opposite side from inlet.

Serial was 6-7C delta. Parallel was 3-4C delta. Another guy on here did the same thing and had even better results (in my case one of the blocks is probably just not as well installed as the other).
So, you are saying, the temps came down to close the gap? I would suspect the flow rates could not be controlled and the first (or both) would get poorer cooling due to the coolant simply flowing passed the meat of the blocks (path of least resistance). That is why I am asking whether the temps moved closer together by going up or down. I cannot imagine they went down. Anybody else ever do this?

Found my answer from Koolance site

Quote:
"To illustrate this point, let's say two video blocks are connected in series. The first video block is operating at 45°C, while the second is at 47°C. This is disturbing to some users. They want both video blocks at exactly the same temperature, so the blocks are reconnected in parallel. However, due to the pressure decrease of parallel paths and additional restrictions in the loop, both cards may now operate at 48°C."
This confirms my theory that one (or both) card will increase in temperature with this configuration. I would not recommend this setup. Sure your cards will both have the same temps, but they will inevitably be higher than if you had a traditional setup.
Edited by nckid4u - 12/19/10 at 4:13am
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post #18 of 22
Thread Starter 
Quote:
Originally Posted by nckid4u View Post
So, you are saying, the temps came down to close the gap? I would suspect the flow rates could not be controlled and the first (or both) would get poorer cooling due to the coolant simply flowing passed the meat of the blocks (path of least resistance). That is why I am asking whether the temps moved closer together by going up or down. I cannot imagine they went down. Anybody else ever do this?

Found my answer from Koolance site



This confirms my theory that one (or both) card will increase in temperature with this configuration. I would not recommend this setup. Sure your cards will both have the same temps, but they will inevitably be higher than if you had a traditional setup.
Theories do not confirm theories lol.

My temps did not increase. All that happened is that the hotter card became a little cooler. The cooler card remained as cool as it was in the first place.

You will have an issue if your head pressure is on the edge of faltering, probably. But that is not a concern in my case. Head pressure of MCP-655 is good for 10 feet, and I am using maybe 7 feet.

And I am pretty sure that EK uses a parallel link SLI connector for up to 3-way SLI. I didn't like the aesthetics of it, though.
Edited by matrices - 12/19/10 at 4:26am
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post #19 of 22
Quote:
Originally Posted by matrices View Post
Theories do not confirm theories lol.

My temps did not increase. All that happened is that the hotter card became a little cooler. The cooler card remained as cool as it was in the first place.

You will have an issue if your head pressure is on the edge of faltering, probably. But that is not a concern in my case. Head pressure of MCP-655 is good for 10 feet, and I am using maybe 7 feet.

And I am pretty sure that EK uses a parallel link SLI connector for up to 3-way SLI. I didn't like the aesthetics of it, though.
Congrats on the temp decrease, although it does seem to defy all laws of physics and common sense. I need to set this up and test it myself because, in my head, there is absolutely no possible way the temps on at least one of the gpus does not go up. Thanks for the info. Testing and results will follow in the next few months.
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post #20 of 22
Something I've noticed in the last several times that I've refilled my loop is that I get alot of air stuck in my radiator...and it doesn't come out on its own. The best way I found to get it out was to shake the crap out of it (which means I shook my entire case). I moved my case roughly 45° off kilter and just held it for a second (I could hear the bubbles come out) and then I shook the crap out of it. Then I went 45° the other direction and got even more.

Temps dropped from 70C to 48C at load in under 3mins. Air in the radiator means that the water isn't cooling properly. With watercooling, don't think of it as the temps are still high but as the delta (difference between idle and load) is small. Your delta is about 20°C which isn't bad especially if you have alot of air in your loop.
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