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Observations on Temperature vs Fan and Pump Speed

post #1 of 4
Thread Starter 
I spent a good deal of time trying to determine how low I could run the speeds of my pump and fans while maintaining cooling performance. My process wasn't entirely scientific, but I thought I might share my results. Here is my hardware setup:

i5-2500K w/ EK Supreme HF Acetal+EN
EVGA GTX570 w/ EK FC580+ Acetal+EN
Swiftech MCP655
XSPC RX360 w/ XSPC 1650rpm fans
XSPC Compression Fittings
Primochill 1/2id Clear Tubing
Phoyba HeGrease on both CPU and GPU
Distilled Water w/ PT Nuke PHN mixed per instructions on bottle

338

Here's a few pictures of how my loop is routed. Disregard the terrible cable management as I plan to sleeve the cables at some point in the near future. I already have parts on the way to get the loop of tubing from the GPU to CPU cleaned up as well.
450
500

Prime95 Blend was running in the background at all times throughout testing. I ran the Unigine Heaven Benchmark two times at each data point and recorded the highest temperature reading.

All of the temperatures are in Celsius. Ambient temprature was consistently 20C throughout testing.

High speed is indicated at around 1550rpm
Medium was around 1230-1260rpm
Low speed was 1030-1060rpm

The results were not exactly what I would have expected:
415

I was unable to run the pump at it's highest speed setting because it aerates the water in the reservoir and begins pulling air bubbles into the pump. I tested low speed fans with lowest speed on the pump for about a half hour with temperatures not varying by more than 1C. Unfortunately, my fans like to make a clicking noise once they get below 1200rpm or so.
post #2 of 4
I am no expert in this area but the result makes sense to me.
Lowest temperature at the fastest pump speed and highest fan speed.
Highest temperature at the lowest pump speed and lowest fan speed.

Yes the middle two columns(pump speed 2 and 3) are kind of weird. I would just say fan speed seems to matter more after pump speed #2.

I am really impressed by the effort you put in to make this. lol. It looks like you only ran the test once. If you really want, you can repeat the experiment and see if you get same result.
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post #3 of 4
Nice work.

I get a lot more variation than that, but i'm using computer hardware with significantly higher heat output.
My fans and pumps also have much wider range between minimum and maximum settings.

Like you, my GPU temperatures vary more with pump speed than the CPU, but it still isn't by a lot.
I've got a lot of radiator, and fans that run as low as 600 rpm to as high as 1950 rpm, so I can generate pretty wide range of water temperatures.

You can get a much more steady load on the CPU, and more heat generation, by running large FTT's in Prime95.
Likewise with Furmark on "extreme burn" for the GPU.
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Grog
(21 items)
 
TC Folding Gimp
(14 items)
 
 
CPUMotherboardGraphicsGraphics
i7-950 Asus P6X58D-E Asus ENGTX470 BFG 9800GT 
RAMHard DriveOptical DriveCooling
Corsair Dominator GT Velociraptor 3000HLFS Lite On DVD burner EK Supreme HF 
CoolingCoolingCoolingCooling
AquagraFX470 EK FC-88 Koolance RP402x2 MCP35x pumps 
CoolingCoolingOSMonitor
Phobya Extreme 200 and Quad 480 radiators. 9x Akasa Viper fans Windows 7 Ultimate Old LG Flatron 1680x1050 
KeyboardPowerCase
Logitech G15 + Logitech G13 game pad Thermaltake 850W Corsair 600T 
CPUMotherboardGraphicsRAM
Phenom x4 9650 Cheap MSI board EVGA GTX580 SC Junk PC-800 DDR2 
Hard DriveOptical DriveCoolingOS
WD Blue Generic DVD Cuplex Kryos HF CPU block, Swiftech MCW82 GPU b... Windows 7 Home Premium 
PowerCase
Antec True Power 650W >10 year old Antec something or other. 
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post #4 of 4
I also did some testing with this loop :
529

For the test I disabled fans on 280 radiator at front and had side panel open so only GTX 240 at top was cooling the system. I only had time to run with cpu this time, for load I used Prime95, Custom, Min FTT 8K, Max FTT 8K. On each flow rate (0.7, 1.0 and 1.3 GPM) I slowed down GT AP-15's from 12 V to 4 V in 0.8 V steps.

0.7 GPM test :
328


1.0 GPM test:
327


1.3 GPM:
328

Results look a bit different than I expected, I can see from kill-a-watt meter that system is taking 15 W more power from wall when pumps are running at high speed. Don't know if that is enough to cause so much temperature differences at low fan speeds. GTX doesn't seem to like fan speeds lower than 1100 very much.
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Shinobi XL
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