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Triple GPU + CPU Water Cooling Loop - Need Advice

post #1 of 28
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In the very near future, I will be building myself a monster gaming PC. I would like everything to be underwater - nice and chilled. I'll highlight the major components that I want to cool, and what I think I'll need to do it. I've also included a proposed layout of the design. Towards the bottom of the post I have a couple of questions.

Components:

GPU:
Either triple GTX 780 Ti Hydro Copper
or triple GTX Titan Black Hydro Copper
The hydro copper waterblock should be the same for both cards, so the cooling components shouldn't change.

CPU
Most likely the intel 4930k, but maybe the 4960X if I'm feeling froggy


For the water loop, I have the following items in mind:

Radiators
Alphacool NexXxoS XT45 480mm rad
Black Ice GTX Extreme 360mm rad

pump
Swiftech MCP655

Res
Bitspower 250 inline res

CPU Block
XSPC Raystorm 2011 CPU Block

Fans
Corsair SP120s

Compression FIttings
Bitspower rotary compression fitting

Tubing
PrimoChill PrimoFlex Advanced LRT Tubing

SLI link components
Bitspower 2 slot Spacing tube
Bitspower SLI multi-link adapter pair

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90

Alternate Solution
CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90



Questions
1. Given the design I have proposed, would the Swiftech MCP655 pump be enough to handle all of that?

2. Am I missing any important details?

Please, any advice or feedback would be greatly appreciated!

Thanks
Edited by Oklahomie - 4/24/14 at 9:28pm
post #2 of 28
With 3 GPU blocks and a CPU - personally I'd run (2) D5's or an MCP35x.

I would also put the rad in the bottom chamber rather than in the front. I'd still get to use the HDD bays.
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post #3 of 28
I run that MCP 655 for 3x GPU waterblock gtx 580, one EK-HF Supreme Full Copper, one EK-FB asus crosshair V formula, and single 240 rad.
post #4 of 28
the D5 will be fine with config. you don't need two pumps.
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post #5 of 28
Quote:
Originally Posted by korruptedkaos View Post

the D5 will be fine with config. you don't need two pumps.

I wouldn't say that.

With 3 GPUs, especially if ran in series, and add to that the 360 Black Ice GTX Extreme which has a flowrate restriction of about twice that of your average radiator, you would really be pushing it with a single D5. Three GPUs is an odd number to try to run in parallel, and if you did try that you'd be dropping the flow rate to each to just 1/3 of the overall loop flow rate which probably wouldn't be good even with a single D5 vario set on speed '5', but to run all three GPUs in series would add a lot of restriction to the loop.

D5s are great pumps (they are the 'best' pump made imho) but they have a high flow rate and lower head pressure making them ideal for simple loops without a lot of restriction. In a loop with 3 GPUs, a CPU and two rads (including the flow-restrictive GTX Extreme) you would be much better off to run dual D5s or a DDC (mcp35x) which has has a higher head pressure which makes it better suited for loops with more than an average amount of restriction. Personally I'd go with dual D5s, but that's just me.
Edited by Unicr0nhunter - 4/23/14 at 5:14am
post #6 of 28
Quote:
Originally Posted by Unicr0nhunter View Post

I wouldn't say that.

With 3 GPUs, especially if ran in series, and add to that the 360 Black Ice GTX Extreme which has a flowrate restriction of about twice that of your average radiator, you would really be pushing it with a single D5. Three GPUs is an odd number to try to run in parallel, and if you did try that you'd be dropping the flow rate to each to just 1/3 of the overall loop flow rate which probably wouldn't be good even with a single D5 vario set on speed '5', but to run all three GPUs in series would add a lot of restriction to the loop.

D5s are great pumps (they are the 'best' pump made imho) but they have a high flow rate and lower head pressure making them ideal for simple loops without a lot of restriction. In a loop with 3 GPUs, a CPU and two rads (including the flow-restrictive GTX Extreme) you would be much better off to run dual D5s or a DDC (mcp35x) which has has a higher head pressure which makes it better suited for loops with more than an average amount of restriction. Personally I'd go with dual D5s, but that's just me.

I agree with Uhunter, this is going to be a restrictive loop, dual D5's well ensure good flow rates and having a second pump for redundancy is priceless.
post #7 of 28
Thread Starter 
Quote:
Originally Posted by Unicr0nhunter View Post

I wouldn't say that.

With 3 GPUs, especially if ran in series, and add to that the 360 Black Ice GTX Extreme which has a flowrate restriction of about twice that of your average radiator, you would really be pushing it with a single D5. Three GPUs is an odd number to try to run in parallel, and if you did try that you'd be dropping the flow rate to each to just 1/3 of the overall loop flow rate which probably wouldn't be good even with a single D5 vario set on speed '5', but to run all three GPUs in series would add a lot of restriction to the loop.

D5s are great pumps (they are the 'best' pump made imho) but they have a high flow rate and lower head pressure making them ideal for simple loops without a lot of restriction. In a loop with 3 GPUs, a CPU and two rads (including the flow-restrictive GTX Extreme) you would be much better off to run dual D5s or a DDC (mcp35x) which has has a higher head pressure which makes it better suited for loops with more than an average amount of restriction. Personally I'd go with dual D5s, but that's just me.


1. Could I switch out my 360 rad to a less restrictive solution and switch over to the MCP35X pump? Or do I need to run dual D5s?

1a. If I need to run Two D5s, what would be the ideal loop design? (parallel or serial? and how would that line up with my loop?)
Edited by Oklahomie - 4/23/14 at 7:03am
post #8 of 28
Quote:
Originally Posted by Unicr0nhunter View Post

I wouldn't say that.

With 3 GPUs, especially if ran in series, and add to that the 360 Black Ice GTX Extreme which has a flowrate restriction of about twice that of your average radiator, you would really be pushing it with a single D5. Three GPUs is an odd number to try to run in parallel, and if you did try that you'd be dropping the flow rate to each to just 1/3 of the overall loop flow rate which probably wouldn't be good even with a single D5 vario set on speed '5', but to run all three GPUs in series would add a lot of restriction to the loop.

D5s are great pumps (they are the 'best' pump made imho) but they have a high flow rate and lower head pressure making them ideal for simple loops without a lot of restriction. In a loop with 3 GPUs, a CPU and two rads (including the flow-restrictive GTX Extreme) you would be much better off to run dual D5s or a DDC (mcp35x) which has has a higher head pressure which makes it better suited for loops with more than an average amount of restriction. Personally I'd go with dual D5s, but that's just me.

im running a D5 on xspc cpu block /2x ek 7990's blocks/2x ek 360 rads. no restristriction problems here?

the pump set on 4 or 5 gives absolutely plenty of flow, maybe 3 blocks is more restrictive idk, but I sort of count mine as four tbh with them

as for rad restriction & whats best? I have no idea, I only have EK rads & never had any issues with them in terms of restriction
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post #9 of 28
Quote:
Originally Posted by Unicr0nhunter View Post

Quote:
Originally Posted by korruptedkaos View Post

the D5 will be fine with config. you don't need two pumps.

I wouldn't say that.

With 3 GPUs, especially if ran in series, and add to that the 360 Black Ice GTX Extreme which has a flowrate restriction of about twice that of your average radiator, you would really be pushing it with a single D5. Three GPUs is an odd number to try to run in parallel, and if you did try that you'd be dropping the flow rate to each to just 1/3 of the overall loop flow rate which probably wouldn't be good even with a single D5 vario set on speed '5', but to run all three GPUs in series would add a lot of restriction to the loop.

D5s are great pumps (they are the 'best' pump made imho) but they have a high flow rate and lower head pressure making them ideal for simple loops without a lot of restriction. In a loop with 3 GPUs, a CPU and two rads (including the flow-restrictive GTX Extreme) you would be much better off to run dual D5s or a DDC (mcp35x) which has has a higher head pressure which makes it better suited for loops with more than an average amount of restriction. Personally I'd go with dual D5s, but that's just me.

Couple of things to remember,even tho that rad has more restriction than most rads,it will not affect flowrates overall,the rad is the least restrictive thing in the loop and amounts pretty much to tubing once the CPU block is installed.
I ran dual 24v d5's thru 2 CPU blocks,3 gpu blocks in serial,2 mobo blocks and 3 480s. I took one offline and ran the other at 12v. I got a temp rise at the CPU of 1-2c. A single d5 is just fine for his proposed loop
Pressure ratings and requirements are massively overrated,especially when max specs are quoted,these are nigh on worthless values.

That said,I run a dual pump setup for good reason,lower pump speeds and redundancy are attributes I want.
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post #10 of 28
Quote:
Originally Posted by korruptedkaos View Post

im running a D5 on xspc cpu block /2x ek 7990's blocks/2x ek 360 rads. no restristriction problems here?

the pump set on 4 or 5 gives absolutely plenty of flow, maybe 3 blocks is more restrictive idk, but I sort of count mine as four tbh with them

as for rad restriction & whats best? I have no idea, I only have EK rads & never had any issues with them in terms of restriction

A single D5 is great for a typical loop with 2 or 3 blocks of restriction along with a couple rads, especially if you are running dual GPUs in parallel since the D5 has higher flow rate but lower head pressure. Once you get to around 4 blocks of restriction then you're still ok, but you're starting to hit to the point where a single D5 wouldn't be as good a choice as a DDC. Of course every block varies in restriction so I'm only speaking in general terms.

Normally you needn't factor rads into the equation as far as restriction goes, except the 360 Black Ice GTX Extreme is more restrictive than most other rads enough so that, as Martin puts it, it is comparable to adding yet another waterblock to the loop.

Also, the OP wanting to run three GPUs presents issues because it's an odd combination to be able to take advantage of running GPUs in parallel which is something that typically works rather well with the higher flow rate but lower head pressure of a D5. If it was just 2 GPUs you'd be OK running them in parallel which adds one block-worth of restriction to the loop by halving the flow rate to each. But with 3 GPUs there's not really a better way to set them up than running all three in series which adds 3 blocks of restriction to the loop with 100% of the flow through each. At least those Hydrocopper blocks are not particularly restrictive, but they also don't perform very well comparably. I'd stay away from them in favor of an EK or XSPC waterblock personally, but that's just me.

That leaves the OP with 3 GPUs + the CPU + the black Ice rad which is essentially 5 blocks of restriction which a D5 by itself could still handle, but not as well as a DDC or dual D5s would. I wouldn't be surprised if you had under a 0.5GPM flow rate with a single D5 on speed '5' with that loop. Dual D5s or a DDC would do MUCH better. That's all I was saying.
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