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Advice on watercooled 6950 CFX and i7 970 - Page 2

post #11 of 27
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GAH! My wallet would never forgive me if I upgraded to 7970's. But... you're probably right.
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post #12 of 27
Quote:
Originally Posted by aznofazns View Post
How about reservoir volume? I read in another thread that volume is mostly irrelevant. Optimally I would like a slightly larger obong res to fill up the empty space in my behemoth of a case.
Reservoir volume is important in that, the more water you have, the more heat capacity your loop will have, but the volume of the reservoir compared to the volume of water in your loop and radiators is pretty insignificant.

If you want an oblong reservoir for your case, then I say go for it. There's nothing wrong with that.

Quote:
Originally Posted by ZealotKi11er View Post
I think its a bit late to water cool the GPUs. CPU in the other hand its a much better idea. I would get a CPU loop only for now.
Why do you think it as "a bit late" to WC GPUs

With my 580 under water, my load temps don't go above 40C at stock clocks, whereas with the stock cooler my load temps were pushing 80C. I reach my volt-limit on OC before I even get to 60C. That seems to me to be worth it.
Edited by Nick2253 - 11/7/11 at 5:13pm
post #13 of 27
Thread Starter 
I think he's referring to that fact that my 6950's are about to become old tech. He's got a point. Especially since my 30" monitor could use all the extra GPU horsepower it can get.
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post #14 of 27
Quote:
Originally Posted by aznofazns View Post
I think he's referring to that fact that my 6950's are about to become old tech.
Ahh. None-the-less, I still think it would be worth it, unless you specifically plan on upgrading to the next gen when it comes out.

I know for me personally, I usually go a few gens before upgrading (I mean the precursor to my sig rig was a C2D E6700 with a 8800gtx!). If that's the case, then putting them underwater is probably a good idea.
post #15 of 27
Thread Starter 
Well I like to stay on top of GPU technology since that's the one area that really impacts gaming performance, which is mostly what I use my rig for.

I think I might just go with a CPU loop for now. When I say now, I mean Christmas break probably. Too busy with schoolwork at the moment to do anything, but I want plan everything out ahead of time. Besides, a 360 + 280 should allow for some awesome CPU overclocking in the meantime.
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post #16 of 27
Quote:
Originally Posted by aznofazns View Post
I think I might just go with a CPU loop for now. When I say now, I mean Christmas break probably. Too busy with schoolwork at the moment to do anything, but I want plan everything out ahead of time. Besides, a 360 + 280 should allow for some awesome CPU overclocking in the meantime.
This would be a nice way to step into WC as well. You could start with one pump and the CPU block. Then, when you get your GPUs, you can add in the other pump and GPU blocks.

Also, if you do SLI/CF, make sure you run the blocks in parallel. That will greatly reduce the restrictions. Just something to keep in mind.
post #17 of 27
Thread Starter 
Quote:
Originally Posted by Nick2253 View Post
This would be a nice way to step into WC as well. You could start with one pump and the CPU block. Then, when you get your GPUs, you can add in the other pump and GPU blocks.

Also, if you do SLI/CF, make sure you run the blocks in parallel. That will greatly reduce the restrictions. Just something to keep in mind.
By parallel, do you mean have CPU/GPU/GPU blocks connected without pump/res/rad between?
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post #18 of 27
No, like:

Code:
    /-GPU-\\
---<       >----
    \\-GPU-/
post #19 of 27
CPU only will let you play more with water-cooling and you can learn from it. Also like you i will be water-cooling my next GPU. Considering its so much easier to water cool once CPU i will probably get a GTX790 or a HD 7990.
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post #20 of 27
Quote:
Originally Posted by Nick2253 View Post
Always, always, always use a single loop. It is one of the most common misconceptions that you will get better performance out of two loops. It's basic math:

I have a CPU that outputs some wattage X, two video cards that output some wattage Y each, and two radiators that can vent wattages V and W. My total load is X + 2Y, and my total exhaust is V + W. We obviously want V + W > X + 2Y, and it your case that would be true. But if you split it into two loops, you are limiting your cooling ability. In other words, if you aren't running your CPU at full speed, but you are running your GPU at full speed, the CPU radiator could be used for additional cooling for the GPU. But if they are in two separate loops, then you are basically wasting cooling capacity.

So, we split the loops: V with 2Y and W with X. If the GPU has full load, say V = 2Y, and the CPU doesn't (X << W), then we could be using the W-X capacity for the GPU, but since they are in separate loops we can't.

Now, it is always true that two loops will, at best, cool exactly as well as one loop with exactly the same components, but at worst, the performance could be half of the single loop. If you have two pumps for your two loops, and then use only one pump for your one loop, then no, you won't get the same performance.

As far as airflow is concerned, it really doesn't matter. However, you do want both radiators in the same direction (ie both intake or exhaust). Generally, I put the radiators as intake, because the PSU is an exhaust no matter what you do, and that way you have all rear-mounted components exhausting.

Generally I'd agree the only issue with this is when overclocking. If you are overclocking your video cards and CPU. By separating them you ensure that the GPU's heat does not affect the CPU loop which might limit your CPU overclock. I tested this once with my i7 920, and 3x4890s. I had a dual pump bay res that could switch between single loop or dual loop. The dual loop performed better while overclocking. While my overclock for the video cards were the same, the CPU benefited from having its own loop.

I personally prefer single loops with dual pumps, since then it's like having a backup pump already in the loop.
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