Originally Posted by Liqu1dShadow
Originally Posted by Maldark
What I was thinking about doing was to run it as push, and then use the 3 supplied Phanteks fans above it in the little fan-compartment, or the other way around. Would that be possible or?
You really wanna keep the fans the same
Mixing fans in push-pull isn't a big deal. Martin (of martinsliquidlabs
) even encourages it: (edit: Gabrielzm beat me to it
Originally Posted by Martinm210
Absolutely, I encourage mixing of fans and have done it many times. The mixing fan phobia generate by forum members is really just another forum myth by users not knowing. I have yet to see any testing to show it being a problem. Actually I have found mixing two different fans to be a benefit at times. When testing the H220 I found two AP15s plus two Helix to be a great match. The helix alone seemed to have a little harmonic under pressure in push only that goes away and smooths out when the GTs were added. Also anytime you mix like fan speeds you can get rpm harmonics so having fans at speeds that are a few hundred off is a good thing.
Noctua even does mixing of fans and speeds on their NH-D14.
While it may not make sense to mix 5000rpm Deltas with 1200rpm yates, I sure wouldn't worry about 500rpm differences particularly when resistance like a radiator is keeping air flows well below either fans max air flow rate. Mixing fans is a good thing..
Originally Posted by OutlawII
Well i put the fans on top of my rad that way no worries about plug,and from what ive read pull works better than push in almost all cases
FWIW, Martin's findings were that pull tends to work a little better at low speeds and push a little better at high speeds, and everything in the middle doesn't really matter either way, but in all instances push-pull, if you have room for it / can afford the extra fans, will provide substantial performance gains. ...
Push Vs Pull - This depends on fan speed/power.
The high speed fans at 2000RPM with a 38mm fan thickness provided the best performance in a push condition. The slow speed fans with 1350RPM with a 25mm fan thickness provided the best performance in a pull condition. I would estimate that performance line is likely to cross in the 1500-1700RPM range where they are equal. So.... slow speed = pull, high speed = push, medium speed = it doesn't really matter.2 fans Push/Pull vs others
- It was very clear that when using two fans per radiator section, that the radiator intself acts as a flow spreader and provided great benefit to straightening out the air for the second fan in a push/pull configuration. Just like doubling up with a pump, there is a pressure benefit to doubling up on fans and this translates to about a 20-30% performance gain. The added fan pressure simply means and added gain in air flow and corresponding performance. None of the experimental pull/pull or push/push configurations provided any noteworthy benefit as it seams the air is simply too disturbed from the first fan to allow the second to perform properly when air is moving. I would always recommend a push/pull configuration for two fans and add a shroud to both sides if space allows.
It's worth noting here though that there are some fans, for example like the Noiseblocker eLoop
, that are not designed to be used in pull.
Also, re: that last little bit in that quote from Martin where he recommends using a shroud, he debunked his shroud findings in a follow-up test
where he used multiple radiators instead of just one. Sometimes there's gains to be had from using a shroud, and sometimes there's not.Edited by Unicr0nhunter - 1/16/14 at 11:52am