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Water cooling Custom Loop Review for 6 to 8 GPUs

1K views 9 replies 4 participants last post by  Koakie 
#1 ·
Hello everyone,

as suggested on the blog of EK water blocks I would like to post here my custom loop and have it reviewed before ordering.

My scope is running 6 to 8 1080ti GPUs, without overclocking, just using the regular maximum operation modes. Specifically I bough these cards with water block already included and mounted: link_1080ti.

6 GPUs will consume about 1200W and 8 about 1550W.

I would like to keep them at operating temperatures of about 50°C with this custom loop:
  1. EK-XTOP Revo Dual D5 PWM Serial - (incl. 2x pump) + EK-RES X3 150 Lite + 1x EK-Furious Vardar EVO 120 (3000rpm) to keep the pump cold
  2. EK-CoolStream XE 480 (Quad) + 4x EK-Furious Vardar EVO 120 (3000rpm)
  3. EK-DuraClear 9,5/12,7mm 3M RETAIL
  4. EK-ACF Fitting 10/13mm - Nickel (6-pack)
  5. EK-DuraClear 9,5/12,7mm 3M RETAIL
  6. Screw set UNC 6-32 30mm (20 pcs)
  7. EK-CryoFuel Clear Concentrate 100 mL
  8. EK-Cable Splitter 4-Fan PWM Extended
  9. EK-ATX Bridging Plug (24 pin)
Consulting the EK water blocks graphs in the blog, this system should have a cooling capacity of about 1000W/10K when fans are running at 2800rpm. I am not sure how to translate this data to my cooling needs.

I tried to maximise as much as possible the water circulating, the dimension of the radiator and the airflow and pressure of the fans. If you have any further suggestions please tell me

I thank you all in advance for the support.

Gab
 
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#2 ·
How about posting a sketch of the layout showing how you intend the water to flow?

It's pretty hard to comment on something without knowing that.

And tiny 3/8" ID tubing has a lot more flow resistance than 1/2\" ID tubing.

 
#4 ·
Good 3/4" tubing is expensive and there isn't much difference between 3/4" and 1/2,. flow wise.

Performance will be greatly effected by routing of the tubing/blocks..

I'm not going to look up the flow resistance of those blocks,I'll leave that to you to do, but I'd imagines that 6-8 of them would present a problem.
 
#5 ·
Hello, thank you for your support.

Can you give me a calculation example I can follow using the flow resistance parameters?

Can you explain how to understand what 1000W/10k are?

I can't find any data on the flaw resistance of the water block of the card on the official page
I looked up on the card features webpage and support documents!
 
#6 ·
For tubing and fittings there are many plumbing sites that give flow resistance data. Just use the datya fro smooth wall plastic pipe, That will ge about the same as plastic tubing.

As fro blocks and rads you have to search for testing sites that actually do their own testing. Almost all the review sites just repost the manufacturer's marketing data so they're pretty useless.

For rads you'll also have to know how much air is flowing through them. Test sites list the fans they used for their test. From that data you can estimate what the fans you plan on using will give you.

Here's some data I gathered on typical fans:



And of course the warning....

 
#8 · (Edited)
Just hook up the rig to a heat exchanger and put the heat into a household-heatingloop/tank/old airconditioning-condenser/whatever that will keep de temps at 35-40 C.

got 8 1080MSI Seahawk EK with two X4 terminals in a custom case that would fit a 19" rack. My single D5 pump is running at 20% PWM from the motherboard. 190L/h. plate heat exchanger takes care of the cooling. Only two 120mm fans in the frontplate of the case at 25% to give a breeze of fresh air inside the case and push it out of the exhaust of PSU's

Edit: make sure you put a blow-off valve on top of your reservoir. i put it on this rig just to be sure. another rig i made with some watercool parts laying around and three Titan XP's and hooked to a X3 terminal i expected the pressure to be alright. the increase in pressure from such a long loop took its toll on the weakest fitting in the loop and there was water shooting all over the place from my EK Bay reservoir.
 
#9 ·
D5 pumps do not need external cooling from the fan you have listed. They have a stainless steel internal structure that very effectively transfers pump heat to the coolant. They differ in this way to the DDC pumps that have plastic internals and can get very hot at high flow rates. That's why there are heatsink kits available for DDC;s but not for D5's.

The 1000W/10K I assume stands for 1000W of heat dissipation at 10kelvin above ambient but if you provide a link to how its used in context I can clarify it. 1000W at a 10K delta is actually very high.

Cooling 8 high power GPU's using a single 480 rad is stretching things even with the rad mounted in the open and with high speed fans if mining is the planned use. The pumps are not the concern.
 
#10 · (Edited)
i have 3 titan XP's on 3 240 radiators with 5 fans. (1 thin radiator, with one fan, 2 thicker with each 2X120mm fans).
i currently run undervolted 24/7 mining Zcoin (cuz nothing pays out so well now) , the power draw from the plug is 360watts. 9,85Mh/s LyraZ.
After the 3 GPUs the water flows through my CPU, basically warming up my CPU. In the BIOS i set a fan curve for the pump and fans that
the fans run slow from 0 to 35 degrees C CPU temp and increasingly go to 100% fan speed when the CPU hits 60C.

at 35% - 40% power use from the 3 GPU's the temperatures are hanging around 40 degree C (39/40/42) ambient temp is 20-22 C.

for 8 GPU's running 24/7 you need a lot of cooling. even if the fans are running full speed.
 
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