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Thoughts on a Y-Splitter for a Paraell GPU loop

post #1 of 15
Thread Starter 
Okay ive had ample time to think about this but i wanted feedback as to if its really going to ensure i get equal temps accross my gpus as well as good flow rate.

As you all probably know my current rig has 3 gtx 580 classified hydro coppers using the 3way water bridge.

I have Liquid in going into the top left fitting, and liquid out comming out of the top right fitting. This gives me equal temps only on the first 2 cards in the loop. The 3rd card is about 5 degrees higher than the rest.

The liquid is being pushed through the loop with 2 MXCP 35x pumps in series.

The Gpu's are between 2 SR-480 Rads built for push-pull.


The loop is as follows:

Res - Pumps - Top 480 Rad - Gpu's - Bottom 480 Rad - Back to Res.

If i use a Y-Splitter and use it properly, will it solve my 3rd gpu temp problem?
post #2 of 15
You run an even greater risk of having even more unequal temperatures with a parallel loop.

You most likely just have a GPU that plain old runs hotter.
post #3 of 15
If the temps are bothering you, I would try reseating the waterblock. A 5 degree temp difference isnt because of position.
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post #4 of 15
Can you rearrange it so the feed and return are from the third gpu or feed from top left and return from bottom right, latter is most likely solution even though 5 degrees is not much. It would P me off because I`ve been a master plumber for 35 years. Y fittings will only work correctly if you have 2 or 4 Gpus or if you have an adjustable flow restrictor in each supply line and a flow meter in each as well. We`re getting a little too complicated now so I`ll sign off. Let us know what you have done and results. 2cents.gif2cents.gif
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post #5 of 15
Thread Starter 
Almost everyone ive talked to on this forum tells me that a parraelll loop accross gpu's will provide equal temps. This is just common sense as the liquid enters and leaves the gpu's quickly or simultaneously and thats how you get equal temps.

I used to run these gpu's in series and the temps were 1 - 2 degrees higher accross each gpu.

as i sad when i changed my loop, i got equal temps with the first 2 gpu's but the 3rd is always 4 - 5 degrees hotter. I dont think its because my 3rd GPU is running hotter because when i had it in a serial loop, they were exactly 1-2 degrees hotter from each other.
post #6 of 15
Quote:
Originally Posted by jblanc03 View Post

Almost everyone ive talked to on this forum tells me that a parraelll loop accross gpu's will provide equal temps. This is just common sense as the liquid enters and leaves the gpu's quickly or simultaneously and thats how you get equal temps.
I used to run these gpu's in series and the temps were 1 - 2 degrees higher accross each gpu.
as i sad when i changed my loop, i got equal temps with the first 2 gpu's but the 3rd is always 4 - 5 degrees hotter. I dont think its because my 3rd GPU is running hotter because when i had it in a serial loop, they were exactly 1-2 degrees hotter from each other.

Your water is in equilibrium essentially everywhere at proper flow rates. Your common sense does not really make sense...


You should try having your outlet on the 3rd card if you must do parallel. That third card is being water starved with your current inlet/outlet set up.
Edited by earthwormjim - 4/21/12 at 2:22am
post #7 of 15
Thread Starter 
Quote:
Originally Posted by earthwormjim View Post

Your water is in equilibrium essentially everywhere at proper flow rates. Your common sense does not really make sense...
You should try having your outlet on the 3rd card if you must do parallel. That third card is being water starved with your current inlet/outlet set up.

Can you explain how it is being water starved?

I had originally set it up the way you were talking about.

i had the inlet on the top left of the bridge, and the outlet on the bottom right of the bridge. with this setup my temps looked like they would for a serial loop. 1-2 degrees hotter from each other.

so when i changed it to inlet and outlet on the top of the bridge, i got the first 2 gpu's equal with the last gpu 5 degrees hotter from the rest.

now if i change my loop so that the inlet is on the top left and the outlet on the bottom left instead of the bottom right, will that do the trick>?
post #8 of 15
Quote:
Originally Posted by jblanc03 View Post

Can you explain how it is being water starved?
I had originally set it up the way you were talking about.
i had the inlet on the top left of the bridge, and the outlet on the bottom right of the bridge. with this setup my temps looked like they would for a serial loop. 1-2 degrees hotter from each other.
so when i changed it to inlet and outlet on the top of the bridge, i got the first 2 gpu's equal with the last gpu 5 degrees hotter from the rest.
now if i change my loop so that the inlet is on the top left and the outlet on the bottom left instead of the bottom right, will that do the trick>?

Water will seek the path of least resistance, in your case the paths that are the shortest in length.

To get to the third card and out of the third card, water must flow through the inlet fitting, the bridge between the first and second card, and lastly the bridge between the second and third card. Then on the way out, water must pass through the bridge between the third and second card, then through the second and first card, and finally through the outlet.

So that last card has a bit more restriction added to it (4 extra fittings). It's not a huge amount, since you only have a temperature difference of 5 degrees, but it is the source of your difference.


With the outlet taken on the third card, you essentially equalize the path length for all three cards.

You will probably have higher temperatures on the first two cards than what you have now, the lack of flow in the third card is being gained by the two other cards, but that third card will have better temperatures since it will be gaining back that lost flow. There's no such thing as free flow...


If you had the inlet and outlet both on the same side (left side you said), I'd imagine water would just completely bypass your cards for the most part. There would be a straight path in and out. You'd have your video cards in parallel with a straight piece of tubing essentially.



What pump are you using by the way? Is that CPU block in the same loop too? Honestly, you might be asking too much for a three GPU loop set up. I would imagine you would need fairly high flow rates to have the GPUs at identical temperatures.

+/- 2 degrees is a pretty small difference. Well within the margin for different quality GPUs and block mounts.
Edited by earthwormjim - 4/22/12 at 2:49am
post #9 of 15
Quote:
Originally Posted by earthwormjim View Post

+/- 2 degrees is a pretty small difference. Well within the margin for different quality GPUs and block mounts.
post #10 of 15
Thread Starter 
so your saying if i set it up with inlet on top left and outlet on bottom right, my cards will not be cooled?!

to answer your question. i have 2 separate loops. soon to be 3.

for now one loop cools the CPU, RAM, and Motherbaord.

the Second loop is just the GPU's

as i stated on my thread,

The liquid is being pushed through the loop with 2 MXCP 35x pumps in series.

The Gpu's are between 2 Black ICE SR-480 Rads built for push-pull.


The loop is as follows:

Res - Pumps - Top 480 Rad - Gpu's - Bottom 480 Rad - Back to Res.
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