Originally Posted by nubbinator
I bought some 140mm BitFenix Spectre Pros to replace the stock fans that came with my Fractal Design Arc Midi. Based on the reviews, I was expecting an impressive fan, but they feel like they're only marginally better than the stock fans and worse than the 120mm Cougar Vortex fans that I've played around with. With my incredibly unscientific hand test, it feels like there's a massive dead spot in the middle of the fan and that the only air being moved is being pushed off to the side at a rather extreme angle. Is this common for the fan? What are other experiences with them? Right now I'm thinking of selling them off and grabbing some Cougar Vortex, Silverstone AP141, or Noctua fans instead.
EDIT: Sorry for the wrong link, I fixed it. I left the standard Spectre specs up anyway just in case anyone is curious. I also needed to amend my take on the Spectre Pros because I initially thought they were 0.60 mm H2O fans.
OP, if you are using densely woven filters (very small holes), that may be the culprit. I have dense-weave filters all over my case, so I only use fans with 1.5mm H2O or higher at max speed (preferably higher, because then I can lower the speed a little bit and still get good pressure... most fans have a fan curve that looks like http://www.xbitlabs.com/picture/?src=/images/coolers/120mm-fan-roundup-2/77_dc_boxo_big.jpg
or something similar so it's not like static pressure plunges immediately if you ease off a little bit on cfm) for all my filtered fan mountings.
BitFenix Spectres are like 0.60-0.62 mm H2O at max speed and imho should ONLY be used with unfiltered intakes or intakes with loose weaves (big holes): http://www.bitfenix.com/global/en/products/accessories/spectre-led#specs
Spectre Pros are double that but 1.24/1.38 (120mm and 140mm models) is adequate-at-best if you use filters with dense weaves, imho; though they should be fine with less-densely woven filters or grilles: http://www.bitfenix.com/global/en/products/accessories/spectre-pro-led#specsEdited by unifiedshader - 6/14/12 at 4:59pm