EXPIRED Mellanox InfiniBand SX6018 - Switch - EMC only - $300 OBO

[saratoga]

I wanted 40x28mm fan on the power supplies so I tried out the Delta FFB0412HN:

FFB0412HN-F00 Delta Electronics | Fans, Thermal Management | DigiKey

Order today, ships today. FFB0412HN-F00 – Fan Tubeaxial 12VDC Square - 40mm L x 40mm H Ball 10.6 CFM (0.297m³/min) 3 Wire Leads from Delta Electronics. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

www.digikey.com

It fits perfectly with the existing screws, and at 6500 RPM it does not trigger any errors (in software or on the front panel). It moves a lot of air though, way more than needed even if you were to really load the power supply, and the noise is still a bit annoying if you're working right next to it in a quiet room. I actually wanted the 5000 RPM FFB0412MN which I think would be a much better choice but it was out of stock with a couple months lead time at Mouser.

For reference:

	RPM	Static Pressure (mmH20)	Airflow
FFB0412HN (28mm)	6500	6.30	10.59
FFB0412MN (28mm)	5000	3.76	8.05
Noctua NF-A4x20-FLX (20mm)	5000	2.26	5.53

 

[eiunst]

so for those looking to do this, note that the vast majority of fans are 40x40x20mm, while the fans that this comes with are 40x40x28 (or perhaps 30 is how it would be measured?). Its a shame there isn't a good source of 40x40x30mm fans as I assume (perhaps wrongly) that a deeper fan like that could push even more air at the same rpm rate, much like the 20mm fan push more air than the 10mm fans.

Old thread, I know. Only wanted to mention that these thicker/deeper fans mostly only add on air guides (stator) on the exhaust side which the Noctuas don't have. This keeps the airflow less turbulent, more directed (and maybe add to the pressure).

 

[Schemer]

Old thread, I know. Only wanted to mention that these thicker/deeper fans mostly only add on air guides (stator) on the exhaust side which the Noctuas don't have. This keeps the airflow less turbulent, more directed (and maybe add to the pressure).

have you seen any good 3d prints that address this? i've seen a couple that extend it to 28mm, but was wonderinf if there was a better one out there