Anyone here using a second fan for their CM Hyper 212 EVO? I believe this is the fan here:
http://www.newegg.com/Product/Produc...82E16835103069
I have been impressed with the 212's cooling performance and quietness, so I might as well try to be more impressed.
The EVO uses a worse fan than the 212+'s fan, ironically. The 212+ uses the BladeMaster but the EVO uses the XtraFlo. In practice it's probably okay to mix and match them due to their similar rpms and flow.
Blademasters are quite good, better flow than most other fans, though they can get loud at max rpm. Klein doesn't know he's talking about imho. Look up ehume's massive Well Dressed Megahalems thread at OCN and you can see for yourself that the Blademaster acquits itself nicely.
Also note that I have nothing against Cougar but their marketing is way ahead of their actual performance. I would NOT use most Cougar fans for any heatsink-related purpose, due to the relatively weak static pressure of most (all?) Cougar fans. (Edit: okay they are apparently rated for 2.2 mmH2O but I don't trust those numbers.
http://www.overclock.net/t/1232477/gentle-typhoon-ap-15-vs-cougar-vortex-cf-v12hp ) Low static pressure fans are great for case exhaust but not so good for intake or shoving air through densely packed fins. For intake/shoving duties, stick to the higher-static-pressure fans like the Blademaster, GT AP-15, etc. The Arctic F12 PWM doesn't have published specs for static pressure, but if you look to see how it does in reviews it's clear that it is at least decent in the static pressure arena.
If you're on a budget get a pair of Arctic F12 PWMs which are quiet and effective, albeit not quite as effective as a pair of Blademasters... but still pretty good and likely quieter.
Note that the EVO is not thick enough to really benefit from dual fans. You will not appreciably lower temps at stock, maybe a little bit if you oc/overvolt a lot.