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-   -   Flow, is there a general rule (http://www.hardwarecanucks.com/forum/water-cooling/57258-flow-there-general-rule.html)

Jaydu October 14, 2012 05:58 AM

Flow, is there a general rule
 
Just curious should I add a second pump??


cpu: koolance CPU-340
Ram: I have no clue the brand but its a waterblock
GPU: 2x koolance N460GTX
res & Pump: koolance RP-401x2 Res, Storm DDC 3.25 18w pump(should I get a second one)
Rads: XSPC RX240s ( might up grade one to a Black Ice xtreme 360)

dandelioneater October 14, 2012 09:50 AM

I've always run single pumps in the loops I've done and for a previous build with 4 blocks and 2 rads I had good flow with just the one pump. I think the only point to using a second pump is for redundancy in the situation that the first pump dies. Just make sure that you plumb in your loop methodically and use the least amount of tubing as possible.

Shadowmeph October 14, 2012 09:55 AM

I have wondered about the speed of the flow, my pump is adjustable and I have the speed set about half, I wonder if there would be any difference in temperature if I changed it

dandelioneater October 14, 2012 10:06 AM

Quote:

Originally Posted by Shadowmeph (Post 662233)
I have wondered about the speed of the flow, my pump is adjustable and I have the speed set about half, I wonder if there would be any difference in temperature if I changed it


From what others have said on the subject, the temperature of the water in the loop reaches equilibrium, so the flowrate doesn't really matter as long as it is moving at a decent rate. If you have decent flow then it really doesn't make much difference for temperatures. Iemperature is mostly dependant on the amount of radiator surface area.

Bungwirez October 14, 2012 10:12 AM

I like two pumps strictly for redundancy.
good thing too, cause this happened last month.
was able to run loop on single pump till back up arrived.

http://i249.photobucket.com/albums/g...2/P1020783.jpg

Jaydu October 14, 2012 10:36 AM

Quote:

Originally Posted by dandelioneater (Post 662243)
From what others have said on the subject, the temperature of the water in the loop reaches equilibrium, so the flowrate doesn't really matter as long as it is moving at a decent rate. If you have decent flow then it really doesn't make much difference for temperatures. Iemperature is mostly dependent on the amount of radiator surface area.


well that is my question, really what is a decent flow rate? I have 4 blocks and 2 what I would think are large rads.

I do like the redundancy of a second pump. but for the price of a new pump I am wonder if I should just upgrade to the d5 pumps and loose my front bay res..

dandelioneater October 14, 2012 11:04 AM

I just look at my reservoir and check to see that there is some turbulence in there. That way I know that there is movement of fluid.

lowfat October 14, 2012 11:19 AM

Quote:

Originally Posted by Bungwirez (Post 662245)
I like two pumps strictly for redundancy.
good thing too, cause this happened last month.
was able to run loop on single pump till back up arrived.

There is a good chance the damage was caused because you were using two pumps. That is if you were running them at full speed. Too much flow is bad for DDCs as it causes the pumps to run very hot. The less restrictive the loop the hotter they run. You do not want much more than 1 GPM w/ DDCs unless you have heatsinks on them.


Now as to the original question, flow really doesn't matter all that much. As long as you are getting 0.2 GPM or more your temps should be fine. It generally would be less than 1C difference between 0.2 GPM and 1 GPM.

KaptCrunch October 14, 2012 11:45 AM

another factor of a second pump is heat dump added to the loop

for system safety in bios set cpu Max temp to shut-down in avent pump failure

Bungwirez October 14, 2012 07:45 PM

Quote:

Originally Posted by lowfat (Post 662265)
There is a good chance the damage was caused because you were using two pumps. That is if you were running them at full speed. Too much flow is bad for DDCs as it causes the pumps to run very hot. The less restrictive the loop the hotter they run. You do not want much more than 1 GPM w/ DDCs unless you have heatsinks on them.

I figured that. Thanks for validating it.


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