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[Official] Cooler Master HAF-XB Club! - Page 1031

post #10301 of 10514
I would like to install an additional fan for my waterforce graphic card (push/pull). What should I consider regarding the specs of the fan (like speed, air pressure etc)? This additional fan should be placed outside the housing - in a pull config.

Do I have an impact if the fan is faster/slower that the "push" fan (e.g. heat accumulation)?

Thanks.
post #10302 of 10514
Here's the inherent problem with comparing temperatures while testing various configurations..




I ran these tests a day apart with identical configurations. The only major variable is the ambient temperature in the room, which shows a 4°C difference which yields, not surprisingly, a 4°C difference in the results.

We can pull the covers off, flip the fans, change fan profiles, but if we aren't listing our ambient temperatures accurately, comparing data with each other becomes a lie of omission.

If anyone posts any pseudo-scientific results regarding a configuration change that they believe to be better, please also post accurate ambient temperatures. Check a few sources; the thermostat if you're in an apartment, a thermometer left on a non-conducting surface such as a cloth, a case sensor left dangling outside the case, etc.

This is absolutely critical. If you don't include an ambient temperature and you post that your GPUs are running at 50°C and all you did was change the fan profile, someone is going to see that information on this forum, attempt to repeat the experiment and fail.

Just a friendly reminder to include as many critical details as possible.
post #10303 of 10514
Quote:
Originally Posted by UdoG View Post

I would like to install an additional fan for my waterforce graphic card (push/pull). What should I consider regarding the specs of the fan (like speed, air pressure etc)? This additional fan should be placed outside the housing - in a pull config.

Do I have an impact if the fan is faster/slower that the "push" fan (e.g. heat accumulation)?

Thanks.

If a push/pull fan pair are running at different speeds and they are the same fan in a closed system (such as sandwiching a radiator), they effectively compete for the same air, causing the pulling fan to be starved of air and the pushing fan to strain to provide it. This is not ideal.

If you're using the same fan for push/pull, use the same speed. If not, attempt to calculate each of the fan's CFM per RPM, then match the CFM by setting the fan RPMs according to that CFM. Then expect to be off by 10% and call it good enough.

Since you're talking about a Waterforce, I'm going to assume you have a 120mm radiator attached to your case. I would suggest 2 static pressure fans of the same model. Static Pressure fans are designed for radiators.

You could also buy one, place the SP fan as an intake on the radiator, and see if it makes an improvement. If you don't spend some time tweaking fan RPMs and curves and monitoring temps accurately, you aren't likely to see an improvement.
post #10304 of 10514
Yes, I have a 120mm radiator attached to my case. Unfortunately I can't use an y-power adapter for an additional fan. So I can install only a fan which have the maximum rpm of the original fan. But what happens if the pushing fan runs at 1000 rpm and the pulling fan 2000 rpm?
post #10305 of 10514
Quote:
Originally Posted by Tiberiusisgame View Post

If a push/pull fan pair are running at different speeds and they are the same fan in a closed system (such as sandwiching a radiator), they effectively compete for the same air, causing the pulling fan to be starved of air and the pushing fan to strain to provide it. This is not ideal.

If you do this, you can expect either a worse resulting temperature or no change at all.
post #10306 of 10514
Thanks for your feedback. So it makes no sense...

Another question :-):

Actually the back plate of the waterforce is very hot and I think it makes sense to install an additional fan on the top of the case (push or pull - I will see...). Unfortunately, due to the tube's of the graphic card and AIO cpu cooler, I can't install a fan inside of the cover. It looks terrible if I install the fan outside of the cover. Does anyone have a good looking solution?
post #10307 of 10514
Quote:
Originally Posted by UdoG View Post

Thanks for your feedback. So it makes no sense...

Another question :-):

Actually the back plate of the waterforce is very hot

How hot is it? Airflow over the plate is definitely important because that plate handled the VRAM and other high-wattage bits but you shouldn't need more than the intake fan directly in front of the GPU can provide. Try increasing that fan's speed, or install one if it isn't there.
post #10308 of 10514
I will check the temperature on wednesday...
fyi - there is no fan on the GPU. As far as i know the two heat pipes and the AIO water cooling system will handle the VRAM too.
post #10309 of 10514
Quote:
Originally Posted by UdoG View Post

I will check the temperature on wednesday...
fyi - there is no fan on the GPU. As far as i know the two heat pipes and the AIO water cooling system will handle the VRAM too.

If that's the case, why is that plate getting so hot? What's heating it?
post #10310 of 10514
I checked the temp on the backplate - below you will find the results.

OC:
Voltage + 87Mv
CPU: 1543-1553 MHz
Mem clock actually + 350 MHz
FAN rpm default

CPU temp during Heaven (6 times Benchmark) = 65-66°

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