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Will my MCP655 pump handle this loop?

N

Nirad9er

2[H]4U
Joined
Feb 18, 2004
Messages
3,035
Right now i have a cpu block, 2 gpu blocks, 360 rad, and a 280 rad. I was thinking about adding another 420 rad to help handle the 290x's and so I can lower the fan speed down for noise.

I have an XSPC dual bay reservoir with an integrated MCP655 pump.

Will my pump handle the 3rd radiator along with the cpu and both gpu blocks?

Thanks
 
It should be fine. If after using it you aren't satisfied you can always add another pump later.
 
Run the GPU blocks in parallel. It should be fine. What radiators do you have?
 
Radiators cause very little pressure drop especially with larger rads. I would be willing to bet that you would hardly see a difference between a D5 vario set to 4 and 5 on that loop.

Thanks for reporting your results.
 
How much does flow effect cooling performance if the pump cannot adequately push through a cpu block, 2 gpu blocks, and 3 larger rads ( 360, 280, 420). It just seems like the temps should have dropped more than 6 degrees after adding that 3rd rad (a 420). Don't you think?
 
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Flow affects performance a lot. I have a dual pump system that has 3 radiators (2x480 and 1x240, four gpu blocks, cpu block). I put both D5 pumps on setting 3, and I got a 6C increase. I put them back on 5 after that. I'm guessing two D5's at 3 is about the same as one D5 at 5? So if you added a second pump maybe you'd get 5C decrease?
 
Two blocks in parallel reduce overall restriction. Two blocks of the same restriction in parallel cut effective restriction in half, rather than doubling it if they were in serial. So overall, parallel has 1/4 the restriction of the same blocks in serial.
 
Tsumi said:
Two blocks in parallel reduce overall restriction. Two blocks of the same restriction in parallel cut effective restriction in half, rather than doubling it if they were in serial. So overall, parallel has 1/4 the restriction of the same blocks in serial.
Click to expand...

His math is correct. Per physics, in parallel 1/R = 1/R1 + 1/R2 so each of the two set of blocks in parallel is half. Then you consider that those two parallel sets are serial to each other which is R1 + R2 = R. So overall, a quad bridge that is semiparallel is exactly the same resistance as a single GPU block.
 
allen5055 said:
Flow affects performance a lot. I have a dual pump system that has 3 radiators (2x480 and 1x240, four gpu blocks, cpu block). I put both D5 pumps on setting 3, and I got a 6C increase. I put them back on 5 after that. I'm guessing two D5's at 3 is about the same as one D5 at 5? So if you added a second pump maybe you'd get 5C decrease?
Click to expand...

for what pressure?

I don't think it works like that? I mean there's probably lots of variables but in a system with no resistance wouldn't 2D5's on 3 flow almost the same as one on 3? I mean once you add pressure drop, resistance etc two would certainly be better but it just seems like there are a lot of variables, including CPU waterblock design that would need to be taken into account. 5C at the CPU or 5C water temps?
 
Justintoxicated said:
for what pressure?

I don't think it works like that? I mean there's probably lots of variables but in a system with no resistance wouldn't 2D5's on 3 flow almost the same as one on 3? I mean once you add pressure drop, resistance etc two would certainly be better but it just seems like there are a lot of variables, including CPU waterblock design that would need to be taken into account. 5C at the CPU or 5C water temps?
Click to expand...

The 5C difference was my gpu temps.
 
allen5055 said:
The 5C difference was my gpu temps.
Click to expand...

That makes more sense actually since those get less flow each than the rest of the system when running in parallel. Have you tried turning one of the pumps off to see how much difference the second one makes? It would be interesting to see the results.
 
Youll be good. I have a D5 which is the same. It running with 2x480mm Rads, 1x280mm Rad, CPU and 2 GPU blocks. I have since added 2 more GPU's + 240mm Rad + a second D5 pump.
 
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