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Flow rate question

post #1 of 5
Thread Starter 
Hi. Just thought I'd tap into the wealth of knowledge here from the liquid cooling community. I have been building custom loops for about the last year and have a pretty good handle on most aspects but my new focus is flow rates. Just recently added a Lamptron CW611 and Koolance flow rate meter and signal converter to my system and so I can see my flow rate for the first time. First, quick loop specs:

Swiftech D5 vario with EK D5 X-res combination pump top and res
approx 6 ft 5/8" od 7/16" id tubing
XSPC raystorm cpu block
2 x XSPC Razor GTX 780 waterblocks in a parallel config
Coolgate 480mm x 60mm rad
Coolgate 360mm x 60mm rad
several XSPC 90 degree and 45 degree fittings with XSPC compression fittings
Tubing runs are mostly straight with no signs of kinking

My flow is approx 0.66gpm on setting 5. Unfortunately I had cut corners when I bought the D5 and didn't know any better so I bought a model without a tach cable so not sure what the RPM's are. Does this seem about right as far as flow rate? Considering if my loop might require a 2nd D5. The 4790K is overclocked to 4.6ghz and the 780's have 100mhz gpu and 200mhz vram oc. Coolant to ambient delta with both cards under full load is about 9c.

Any thoughts are appreciated. Thanks
Edited by zmn668 - 10/17/14 at 9:26am
post #2 of 5
Quote:
Originally Posted by zmn668 View Post

Hi. Just thought I'd tap into the wealth of knowledge here from the liquid cooling community. I have been building custom loops for about the last year and have a pretty good handle on most aspects but my new focus is flow rates. Just recently added a Lamptron CW611 and Koolance flow rate meter and signal converter to my system and so I can see my flow rate for the first time. First, quick loop specs:

Swiftech D5 vario with EK D5 X-res combination pump top and res
approx 6 ft 5/8" od 7/16" id tubing
XSPC raystorm cpu block
2 x XSPC Razor GTX 780 waterblocks in a parallel config
Coolgate 480mm x 60mm rad
Coolgate 360mm x 60mm rad
several XSPC 90 degree and 45 degree fittings with XSPC compression fittings
Tubing runs are mostly straight with no signs of kinking

My flow is approx 0.66gpm on setting 5. Unfortunately I had cut corners when I bought the D5 and didn't know any better so I bought a model without a tach cable so not sure what the RPM's are. Does this seem about right as far as flow rate? Considering if my loop might require a 2nd D5. The 4790K is overclocked to 4.6ghz and the 780's have 100mhz gpu and 200mhz vram oc. Coolant to ambient delta with both cards under full load is about 9c.

Any thoughts are appreciated. Thanks

Your flow rate for what you have in your loop with regards to restriction seems to be about right where it should be. If that is what your looking for with adivce on this loop's flow rate? To give a reference point I have a dual loop with each loop using a D5 pump. One loop has an EK pump top and res, and the other has the Aqualis pump top and res. On one loop I have just the CPU, one 480 UT 60, and one 360 UT 45. The other loop has two 780ti under EK waterblocks, and two 480 UT 60. Both loops have aquacomputer flow meters on them. On the CPU loop I'm getting 218 lpm or .95 GPM, and on the GPU loop is 320 lpm or 1.4 GPM. As you can see by the difference in the two flow rates the CPU block is causing the most restriction out of both loops. Both loops have 10mm 12mm EK acrylic tubing with an equal amount of 90 degree fittings. Your flow meter also has a fair amount of restriction to it. So if you do get another pump you will see an increase in flow rate for sure, but improving your temps is probably up for debate. When I started researching flow rates myself to see if mine was okay for my loop, it seemed the general concensus was to shoot for around 1 GPM. Hope this helps. thumb.gif
post #3 of 5
That is a really low flow rate for what you have listed in that loop. 0.7 GPM would be fine for a fully serial loop with a few more blocks but with parallel GPU's its really low.

A simple loop like that should not need two pumps though. Are you sure the pump is at full speed ( the dial can be a bit deceptive to read)
I can't remember if the CW611 works properly with the Koolance meters?

My loop is way more restrictive than yours and I can get 1.3 GPM easily

Either way a higher flow rate won't make much of a measurable difference to the Loop delta but might to core temps on the GPU's if they are really only getting 0.35 GPM each.
Edited by Jakusonfire - 10/18/14 at 7:05am
Kusanagi
(21 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 3570K Asus Sabertooth Z77 EVGA GTX 780 SC Corsair Vengeance Pro CMY16GX3M2A2133C11 16GB 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 256GB X2 EK Supremacy Aqua Computer Aquaero 6 Pro Aqua Computer D5 USB 
CoolingCoolingCoolingCooling
Aquacomputer MPS 400 flow meter EK-CoolStream PE 360 EK-Coolstream PE 240 Noiseblocker Eloop B12-PS 
CoolingCoolingCoolingCooling
EK Vardar F2 EK-FC Titan Acetal & Nickel EK-RAM Monarch X4 Clean CSQ - Acetal+Nickel EK-D5 X-RES 140 CSQ 
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Kusanagi
(21 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 3570K Asus Sabertooth Z77 EVGA GTX 780 SC Corsair Vengeance Pro CMY16GX3M2A2133C11 16GB 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 256GB X2 EK Supremacy Aqua Computer Aquaero 6 Pro Aqua Computer D5 USB 
CoolingCoolingCoolingCooling
Aquacomputer MPS 400 flow meter EK-CoolStream PE 360 EK-Coolstream PE 240 Noiseblocker Eloop B12-PS 
CoolingCoolingCoolingCooling
EK Vardar F2 EK-FC Titan Acetal & Nickel EK-RAM Monarch X4 Clean CSQ - Acetal+Nickel EK-D5 X-RES 140 CSQ 
OSMonitorMonitorPower
Win 8.1 Pro 64 bit Samsung S27A750d LG E2290V-SN Silverstone Strider Plus 850W ST85F-P 
Case
Corsair Obsidian 750D 
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post #4 of 5
Thread Starter 
Thank you both for the answers. The Koolance flow rate meter and signal converter was recommended for the CW611 by the Lamptron rep in it's thread so I think I'm ok there. I wonder if there is air trapped in my loop that is impacting the reading. I had to drain and fill the loop to install the flow meter. Over the last 24hrs the flow rate has increased from .66 to .77. I did confirm the the pump is set to 5 so it is set to max speed. GPU temps under full load are approx 46c with the overclock I mentioned earlier. Room ambient about 23c and coolant to ambient delta approx 9c.
post #5 of 5
Thread Starter 
Gunk in the Raystorm CPU block was the culprit. Took it apart yesterday and gave it a good cleaning. Flow is nearly 1.4 GPM on setting 5 now. Thanks again for your input.
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