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Seemingly very low flow rate in my loop. Should I be concerned?

post #1 of 12
Thread Starter 
I just upgraded my loop in a CL TH10 + Pedestal and included in the upgrade was a Bitspower flow meter and a Lamptron CW611. The readout on the CW611 is showing only 11 LPH and only .04 GPM (about 175RPM), which seems crazy low to me given that I'm using two Swiftech MCP655s in series both running at max 5 setting.

I am using 5 Black Ice GTX rads, which I understand to be more restrictive than most rads, have angled fittings all over the place, and 7 waterblocks. I expected it to be low given all that, but .04 GPM?

It's a single loop and the order is as follows:

XSPC Bay Res w/ 2 D5s > PCH Block > CPU Block > Mosfet Block > Flow Sensor > Black Ice GTX 480 > Black Ice GTX 480 > 4 EK 7970 Waterblocks connected by semi parallel bridge > Black Ice GTX 560 > Black Ice GTX 560 > Black Ice GTX 360 > Back to XSPC Res

Is this to be expected with such a restrictive single loop? Could plasticizer buildup in my blocks be causing this? Would I get better flow by not using a bay res?

My temps seem to be fine. CPU idles at 23C (1.42V), GPUs at 26C, motherboard about 26C. Since my temos are fine should I even care? Looking forward to everyone's feedback!
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post #2 of 12
I love it how people think the faster the water goes the better it will cool.

is the temps of your cpu/gpu fine?

if yes then don't stress


EDIT:

just read your post... seems a lot of work just for one pump
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post #3 of 12
Thread Starter 
I'm not stressing too bad given my excellent temps, but I have heard about people aiming for 1GPM flow rate and .04 was sooo far off from that I couldn't help but double check with the fine folks here on OCN :-)

I am using TWO MCP655s.
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post #4 of 12
Quote:
Originally Posted by craptastic7 View Post

I'm not stressing too bad given my excellent temps, but I have heard about people aiming for 1GPM flow rate and .04 was sooo far off from that I couldn't help but double check with the fine folks here on OCN :-)

I am using TWO MCP655s.

that 1GPM is very flawed.

this will change from loop to loop.

factors

rad size
pump size
pump default speed and and and

the only thing you need to keep an eye on, is the pump outlet pressure. if it reaches max pressure it will stop flowing as such. and then you can burn out the pump ( i said can not will).

In the real world of engineering, if we want to cool things down better ( maritime marine) we actually slow the flow rate down so there is better heat transfer. if we need it to heat up we speed things up so there is no time for it to cool down.
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post #5 of 12
With martins flow estimator just on components not including flow sensor, you are likely down in the 0.5 gpm range even with 2 pumps, could be less depending on restriction of others, or if you have a blockage then even lower, at 0.5gm you should be fine.

If you were really as low as .04 gpm, your load temps should get bad, as that is way off the curve...cant tell as much by idle temps. Use your gpu temp as temp of water at idle, then run prime on cpu for 15 minutes and and compare gpu temp (water temp) at cpu load vs cpu idle, an easy fairly accurate way of measuring delta of water temp load to idle. If your delta is decent, ie only few c, then your flow meter set up is inaccurate.
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by opt33 View Post

With martins flow estimator just on components not including flow sensor, you are likely down in the 0.5 gpm range even with 2 pumps, could be less depending on restriction of others, or if you have a blockage then even lower, at 0.5gm you should be fine.

If you were really as low as .04 gpm, your load temps should get bad, as that is way off the curve...cant tell as much by idle temps. Use your gpu temp as temp of water at idle, then run prime on cpu for 15 minutes and and compare gpu temp (water temp) at cpu load vs cpu idle, an easy fairly accurate way of measuring delta of water temp load to idle. If your delta is decent, ie only few c, then your flow meter set up is inaccurate.

I just got everything setup and haven't given it a chance to stretch it's legs yet. I'll run some stress tests this evening and report back. I really appreciate the feedback thus far!

Also, when I installed the flow sensor they give you two sets of plastic rings that are different diameters. These were "diameter conversion pieces" that you stick in the flow sensor. There was no instruction given on which ones to use so I kind of winged it and just put the larger inner-diameter ones in there. Did I even need to use those? Could they be screwing with the readout? I'd rather not have to drain the loop to find out. I am using 1/2 x 3/4 tube BTW.
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post #7 of 12
I just realized are you using this bitspower flow sensor...you cant convert those to flow, you only know rpm's. You would have to measure your flow manually with stop watch and gallon jug, and then as long as you dont change anything substantial, you could convert rpm to flow in just your loop, with a formula that only worked for your loop. The CW611 is not going to give you anything accurate with that sensor.

So your flow is probably 0.5gpm range...little more or less depending on parallel gpu setup and how restrictive your blocks are. I have seen 140's to high 200's for RPMs from bitspower flow sensor.
Edited by opt33 - 4/17/14 at 1:06pm
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by opt33 View Post

I just realized are you using this bitspower flow sensor...you cant convert those to flow, you only know rpm's. You would have to measure your flow manually with stop watch and gallon jug, and then as long as you dont change anything substantial, you could convert rpm to flow in just your loop, with a formula that only worked for your loop. The CW611 is not going to give you anything accurate with that sensor.

So your flow is probably 0.5gpm range...little more or less depending on parallel gpu setup and how restrictive your blocks are. I have seen 140's to high 200's for RPMs from bitspower flow sensor.

I'm actually using the upgraded one with the tachometer that plugs right into the CW611. This one: http://www.frozencpu.com/products/16903/ex-tub-1371/Bitspower_G14_Thread_Flow_Sensor_-_Matte_Black_BP-FS-CLBKMBK.html?tl=g30c101s457

When you set a channel on the CW611 to flow meter it gives you the option to have the readout be LPH, GPM, or RPM. You're saying that the mechanism the CW611 uses to convert the RPMs to LPH or GPM is crappy? It reads out about 175 RPMs and you're saying that probably converts to about .5GPM? That's very good to know. Just want to make sure I'm understanding this. Looks like I maybe should've spent a little extra and gone with an Aquaero.
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post #9 of 12
Thread Starter 
I've been running Prime95 for a little over an hour and CPU temps have not gone above 55C (4.7GHz @ 1.42V) in CoreTemp. Doesn't look like I should be concerned. Thanks again everyone for the input.
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post #10 of 12
Yeah your flow is clearly ok, and yes probably 0.5gpm or higher. And yes the bitspower flow sensor from your link only reads rpm's, any conversion to gpm by the CW611 will be inaccurate.
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