CFM Rating of GPU fans?

stuman · 29 Aug 2018 at 22:42

Hi all,

I have been trawling thorough the internet to try and find some information about the fans that come "as stock" on my graphics card.

I have even been as far as the Chinese OEM sites in the hunt for the information but have come up trumps.

There seems to be current draw and power consumption figures but nowhere do it state the CFM outputs of these fans.

Most cards seem to use very similar fans when at the 90mm size.

does anybody have any CFM readings? even just to give ball park figures....

I'm wondering if one of the new Noctua's will provide more airflow or if I will need to double up.

doyll · 30 Aug 2018 at 13:54

Please define 'one of the new Noctua's'.

Many of us have removed stock GPU fan shrouds & fans to replace them with 25mm thich fans for more airflow, lower temps and much less noise. I've done a few using 13mm thick fans like TY-100 Thermalright supplies on AXP-100H coolers with good results.

Tealc · 30 Aug 2018 at 14:25

I replaced two 90mm X 13mm ( I guess they were) with a single 140mm strategically cable tied in place. This fan spins at around 500rpm and manages to cool the 970 card within a degree or two of the stock fans which were really quite noisy.

stuman · 30 Aug 2018 at 15:24

The new Noctua NF-A12x25 PWM Fan

https://www.overclockers.co.uk/noctua-nf-a12x25-pwm-fan-120mm-fg-06r-nc.html

60 cfm.

The general idea would be to create a 1" high duct with a couple of dividing fins (to even out the airflow over the entire heat sink area) and have just 1 fan.

The other option is like everybody else has done and go with the normal Noctua fan and just have 2 zip tied on which I also don't fall out with....

doyll · 30 Aug 2018 at 15:39

Honestly zip-ties are the future. I would zip-tie the 2 outer middle fan holes together a 1 ziptie on each pair of holes. Back doesn't need any becuase ends will hold middle in place. On the ends I use 2 zipties on each end, one is 'bolt' with it's head holding at hole with zip-tie behind fins and through other hole on same end, then slip the end of another zip-tie onto end through hole to act as a 'nut' locking other zip-tie in place.

Similar to what is done in link below, but this one has no openings between corner flanges to hide end in.
http://i.imgur.com/V0bNwM9.jpg

Here is link to another with open corner flanges:
http://www.eltonmaizemaze.co.uk/Jessica/GTX260/22large.jpg

stuman · 30 Aug 2018 at 17:08

I've seen similar quite a few times. looks pretty easy to do. was just considering if it is worth the extra few £ for the 2 fan setup.

LuckyBenski · 31 Aug 2018 at 08:46

stuman said:
I've seen similar quite a few times. looks pretty easy to do. was just considering if it is worth the extra few £ for the 2 fan setup.

I'd say so. Two fans running below audible levels will offer as much cooling or more than one speeding up to noisy levels.

I fitted a 120mm and a 92mm fan to an Arctic Accelero heatsink. Both stayed basically on minimum speed and the card ran miles cooler. You could always try a single fan and add the other later. I wouldn't bother with the fan shroud really, seems a lot of faff and space to waste.

doyll · 31 Aug 2018 at 11:03

What LuckyBenski said.

I have had good luck using Arctic F9 TC and Arctic F12 TC .. they also make Arctic F8 TC but I have not used them. Their thermal probe speed control works quite well with probe slipped in between finpack and PCB and moved around so probe sense heat and ramps up as needed. I don't like their pro series. I prefer a shroud around fan impeller. I also prefer fans side by side the full length of cooler finpack. OcUK doesn't have all sizes, but they are available on river/jungle site.