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post #58181 of 106452
there are a couple users here who did parallel including the cpu. if i feel unlazy, i will try to find them.
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post #58182 of 106452
Quote:
Originally Posted by sinnedone View Post


Thank both of you.

So basically I just need to fit as much rad space as possible with the least amount of bends especially 90's. Hey this is sort of like planning the intercooler tubing on one of my project cars lol tongue.gif


How about this, running the tubing in parallel with both gpus? What would happen if the parallel tubing included 2 gpus and cpu?

People run GPUs in parallel all the time...in fact it is becoming the more popular thing to do. the most common and best looking way to do this is to connect the inlets and outlets between the cards with either the Bitspower Crystal Links or one of the many SLI connectors.




The key points between the two setups:
Series you usually have each subsequent card hotter than the first (say 48, 50, 52 for 3 cards) vs Parallel where all cards are roughly the same temp (51,51,51 for 3 cards)
Parallel is less restriction in the loop than series
Parallel has slower flow over each cards (flow is roughly 1/N cards) than Series



Now in terms of running parallel to the CPU as well, then you need to make sure your pump will be able to crank out enough flow that your blocks have water moving fast enough. CPU blocks tend to have a lot more restriction, so your GPUs will definitely not get as much water.

For example, let's say a CPU block is 2x the restriction of the GPUs.
then roughly 1/2 the flow would go to CPU, 1/4 over each of the GPUs.
Continuing this example, if your pump is only getting you 1 Gal/m, then you probably are not going to cool your components enough. if it was like 2 Gal/m, then you probably would be ok.

Each block has different restrictions, so you would need to do some research as to how much restriction you have and look at some pressure curves to see what kind of flow your pump will produce for your setup.

I personally recommend doing everything in series, save the two GPUs can be in parallel.
Edited by cyphon - 1/10/14 at 1:38pm
post #58183 of 106452
Thread Starter 
Quote:
Originally Posted by sinnedone View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by Jimhans1 View Post

No, loop sequence has little to no effect on temps overall. Just try to make you tubing runs as short as possible, if that means you hit a radiator between some blocks, ok, but the only thing that you want with regards to order is to have your pump after or part of you reservoir.

Quote:
Originally Posted by cyphon View Post

Same. Loop order doesn't matter once equilibrium is reached. Go with whichever looks better and results in the cleanest tube runs

Thank both of you.

So basically I just need to fit as much rad space as possible with the least amount of bends especially 90's. Hey this is sort of like planning the intercooler tubing on one of my project cars lol tongue.gif


How about this, running the tubing in parallel with both gpus? What would happen if the parallel tubing included 2 gpus and cpu?

Not a lot except your GPU temps will go up slightly. Parallel reduces flow between the blocks for a slight increase in overall flow ...and i mean slight as in worthless....and increased GPU Temps. Adding the CPU as a parallel component means serious flow needs to be maintained....think along the lines Dual 24v strongs or Iwaki pumps.

Its more for aesthetic value for me,I tried it a few times and its never had better performance than serial.
Edited by B NEGATIVE - 1/10/14 at 1:43pm
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post #58184 of 106452
Thank yoy Jimhans1 for your input.

pc-illiterate lol thank you

cyphon, in the picture you posted would it be possible to set up so the feed line and return lin on the parallel gpus enter and exit on the same side? ie both from top or both from bottom?



I definitely wouldn't want to restrict flow that way, so I'll definitely keep researching thumb.gif



*EDIT*
Thank you B NEGATIVE, its purely an aesthetics thing that has me thinking about gpus in parallel.
*EDIT*
Edited by sinnedone - 1/10/14 at 1:47pm
   
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post #58185 of 106452
Quote:
Originally Posted by sinnedone View Post

Thank yoy Jimhans1 for your input.

pc-illiterate lol thank you

cyphon, in the picture you posted would it be possible to set up so the feed line and return lin on the parallel gpus enter and exit on the same side? ie both from top or both from bottom?



I definitely wouldn't want to restrict flow that way, so I'll definitely keep researching thumb.gif



*EDIT*
Thank you B NEGATIVE, its purely an aesthetics thing that has me thinking about gpus in parallel.
*EDIT*

read! http://martinsliquidlab.org/2011/01/30/fittings-and-elbow-impacts/
Quote:
Elbows and fittings do cause some restriction, but it’s very much fractions of a degree and impacts flow rate much more than it does temperature... it would take almost 30 each 90 degree elbows to add up to 1 degree in CPU temp rise.
thumb.gif
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post #58186 of 106452
Quote:
Originally Posted by B NEGATIVE View Post

Not a lot except your GPU temps will go up slightly. Parallel reduces flow between the blocks for a slight increase in overall flow ...and i mean slight as in worthless....and increased GPU Temps. Adding the CPU as a parallel component means serious flow needs to be maintained....think along the lines Dual 24v strongs or Iwaki pumps.

Its more for aesthetic value for me,I tried it a few times and its never had better performance than serial.

FWIW, Swiftech published a study and found the differences between running GPUs in series vs parallel is "nonimal", and at least in their case they managed to get a fraction of a degree benefit to running GPUs in parallel vs in series.

http://www.swiftech.com/Resources/White_papers/Actual%20influence%20of%20flow%20rate%20on%20system%20temp.pdf (PDF)



After reading Swiftech's results I've kind of assumed that since DDCs perform better, less prone to overheating, with more restriction, they would tend to favor being run in serial, and D5s, with a higher flow but less head pressure so favor loops with less restriction, so would slightly favor running GPUs in parallel.
post #58187 of 106452
Quote:
Originally Posted by sinnedone View Post

Thank yoy Jimhans1 for your input.

pc-illiterate lol thank you

cyphon, in the picture you posted would it be possible to set up so the feed line and return lin on the parallel gpus enter and exit on the same side? ie both from top or both from bottom?



I definitely wouldn't want to restrict flow that way, so I'll definitely keep researching thumb.gif



*EDIT*
Thank you B NEGATIVE, its purely an aesthetics thing that has me thinking about gpus in parallel.
*EDIT*

Yes, that is perfectly fine to do in a parallel GPU loop.
post #58188 of 106452
I don't get it. I've filled the reservoir and let the pump run a few times. While the pump still empties the reservoir, when I turn off the power now the water rushes back into the reservoir.

What should I do? Should I just keep the pump running and fill it up that way at this point?
 
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post #58189 of 106452
Quote:
Originally Posted by sinnedone View Post

Thank yoy Jimhans1 for your input.

pc-illiterate lol thank you

cyphon, in the picture you posted would it be possible to set up so the feed line and return lin on the parallel gpus enter and exit on the same side? ie both from top or both from bottom?



I definitely wouldn't want to restrict flow that way, so I'll definitely keep researching thumb.gif



*EDIT*
Thank you B NEGATIVE, its purely an aesthetics thing that has me thinking about gpus in parallel.
*EDIT*

No, if you do that 1 card or the other will not get flow across it.
Yest it is fine if they are both on the top or both on the bottom.

If you put the in and out both on the left or right, then neither card will get flow as it would be a straight pass thru
Edited by cyphon - 1/10/14 at 2:20pm
post #58190 of 106452
Quote:
Originally Posted by Gunderman456 View Post

I don't get it. I've filled the reservoir and let the pump run a few times. While the pump still empties the reservoir, when I turn off the power now the water rushes back into the reservoir.

What should I do? Should I just keep the pump running and fill it up that way at this point?

If the reservoir isn't the highest point in the loop, you will run into that, in that instance, I've just left the pump running and filled it, IF you have enough fluid to keep the pump underwater!!!!
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