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Radiator Size Estimator - Page 9

post #81 of 85
ohh! thanks for this neat calculator

http://outervision.com/power-supply-calculator

the numbers are quite accurate thumb.gif
is not exact, but it's very close to what I see in my APC power usage load display
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post #82 of 85
Thread Starter 
Sorry folks, haven't been in of late with work and all .... but to address some of the questions in recent months

It's all a balancing act. To reduce the amount of rad you can:

.... you can let Delta T climb higher which adds more heat to the inside of your case and reduces water block efficiency. With a delta T of 10 (ambient = 23C) , you have 33C water cooling your 72C (assumed goal) CPU. At 20C, you have 43C water cooling that CPU and, with the same theoretical block efficiency, temps would be 82C

... you can increase fan speed, which will increase noise. I base my designs on 10C Delta T and 1250 rpm fans. In practice, I limit fan speeds to 850 rpm and Delta T ranges from

7C with rad fans off and light loads
8.6C w/ fans locked in at 1250 rpm under full bore stress test (Furmark) at peak OC (26% on SLI'd GFX cards)
12.4C w/ fans responding to temp / speed curve (never breaks 850 rpm) under full bore stress test (Furmark) at peak OC (26% on SLI'd GFX cards)

During gaming, fans are usually in the 550 - 650 rpm range and Delta T ranges from 7.5 to 9.1 C

That's with a calculated 796 watt "theoretical system load" and tests were done with 5 x 140mm of radiator with fans in push ONLY.
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post #83 of 85
Guys,

I need your opinion on this: do you think my calculations are proper

1 x 360 rad 60mm thick 10fpi at 1000rpm push will dissipate around 151W
1 x 360 rad 30mm thick 16fpi at 1000rpm push will dissipate around 150W - is this reliable? If not, what is the approximate wattage for it? Please pay attention to 16fpi vs 10fpi.

At 1250rpm the difference is getting slightly larger (according to aphacool xls) 188W vs 181W - but this is around 5%. At 1400rpm (max speed of PL2) the difference is 210W vs 199W, 5%.

Does this all mean that my 6x360 + 3x240 30mm thick 16 fpi at 1000RPM will output 6x150+3x100=1200W which is almost 2x more than 3x 480 60mm thick 10 fpi rads (3x200W at 1000rpm)?

My questions is related to my previous 7x 1080 build on 3x 480 60mm 10 fpi rads - temps on 7 gpus while rendering never got higher than 50C. Now I need to cool down 11x 1080TI. Do you think that 24x 120mm cooling units of 30mm thickness will do 2x better job than 12x120mm 60mm at low 800-1200 rpms?
Edited by smicha - 4/20/17 at 1:17am
post #84 of 85
of course 24 x120 is going to cool better than 12 x 120 no matter the thickness of normal rads. i say normal because someone is going to say something stupid like "what about a 10mm thick rad?
so yes, 24 > 12 double the surface area is a clear winner.
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post #85 of 85
Quote:
Originally Posted by pc-illiterate View Post

of course 24 x120 is going to cool better than 12 x 120 no matter the thickness of normal rads. i say normal because someone is going to say something stupid like "what about a 10mm thick rad?
so yes, 24 > 12 double the surface area is a clear winner.


Thank you. I am really surprised that heat dissipation is same for 30mm and 60mm rads at low RPMs, 1000RPM.
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