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Trifire GPU cooling - serial or parallel?

post #1 of 11
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I noticed a lot of OCN members are cooling their GPUs in parallel. Is there any benefit? Or is it just for looks?

My loop order is res > pump > rad > cpu > mobo > gpu3 > gpu2 > gpu1 - so water travels uphill through my gpus.

Here is what my serial loop looks like right now...

IMG_4465.jpg
    
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post #2 of 11
Serial should provide higher flow rate through the blocks. Some people probably will probably tout parallel as sending the same temp water to each block, resulting in more equal cooling, but I think the higher flow rate probably trumps that.

Think of it this way: with parallel you might have all your blocks at 40c (say); with serial they might be something like 35c, 37c, 39c, from first to third.

I could be wrong though.
post #3 of 11
I'm no expert but I thought that the temperatures equalize over time, meaning running at load everything will be the same temp regardless of location.

Probably just one of those things people do... kinda like how some people run dual loops when single loop is more effective in 99% of situations.

Also gravity has no effect on your loop. The water travels down the same way it travels up equalizing the equation.
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post #4 of 11
Quote:
Originally Posted by Intangible;12552496 
I'm no expert but I thought that the temperatures equalize over time, meaning running at load everything will be the same temp regardless of location.

Yeah, that's generally accurate, I believe. It may be less true though if you have a loop with a lot of restriction such that flow rate suffers, or possibly if your loop is very long/has a lot of blocks. It's probably not significant with most loops though.
post #5 of 11
Parellel FTW, because it lowers restrictions by a huge bit, and allowes cool liquid flow through both cards at the same time, instead of cold liquid entering then hearing up in firs gpu then the hot liquid flows into the second GPU, and thats a nono,
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post #6 of 11
Quote:
Originally Posted by RushMore1205;12552528 
Parellel FTW, because it lowers restrictions by a huge bit,

You might have a point there, but this -
Quote:
and allowes cool liquid flow through both cards at the same time, instead of cold liquid entering then hearing up in firs gpu then the hot liquid flows into the second GPU, and thats a nono,

- I don't agree with. It takes a lot of heat energy to make water significantly warmer, and the water is moving through the loop sufficiently quickly that the temperature gradation around the loop is quite small.
post #7 of 11
Parallel results in less overall restriction, though the flow through the waterblocks will probably be slower. With that motherboard block you might get better results making a pair of subloops, one with the CPU and board and the other with the graphics cards. I haven't done any calculations yet, but all I'd do is use the flow rate calculator Martin made to see if the restriction between the two would be about the same.
    
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post #8 of 11
Parallel circuits (and pumped fluids) reduce system resistance, while serial circuits (and pumped fluids) add resistances. The advantage happens with parallel when the block is designed to be low flow high turbulence as opposed to high flow low turbulence. The concept is to maintain (total) high system flow rates by dividing resistances rather than adding them together. Magic number being somewhere around 1 GPM. It is true that the flow rate in the parallel portion of the loop will be lower, but block design compensates, and in some situations (universal gpu blocks in particular) the advantage is clear.
 
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post #9 of 11
things will reach a thermal equilibrium at a certain point so it doesnt matter too much. but thats my view anyway... ive only ever done one 3 card system though.
     
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post #10 of 11
Thermal equilibrium happens, and that much is true as well, however, should a setup (lets say for instance) a single pump with many serial blocks reduced the overall system flow rate, that lack of flow could adversely impact the cooling power of any given radiator. This assumes that the radiator has cooled (lets say) in a given minute X amount of fluid to 90% of whatever it is going to do at that outside air temp, the best way to get more out of it, is to get that cooled fluid out and warm fluid back in.

Thus system equilibrium (could) be higher, due to lack of flow. There are many variables to consider when determining at what point equilibrium will be attained.
 
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