Following up with the review of the higher speed PK-3 variant, now it is time to take a look at the Blacksilent Pro PK-2 fans. This was one of the fans that Blacknoise had sent for the radiator testing, and thus I have 8 samples to get a decent statistical representation of. Thanks again to Niels and Dirk for helping out.
Let’s begin by taking a look at the specs courtesy the product page:
As with the other fans from Blacknoise, the Blacksilent Pro fans share the same product page with a table listing out the nominal differences. The PK-2 is their medium speed variant rated at 1200 RPM and is a 3 pin, voltage controlled fan. The data sheet on the same page gives more information about the fan including an operating voltage range of 3.5-13.8 V, a starting voltage of 4 V, a rated input power of 1.08 W (not to be confused with rated operating power) as well as an operating temperature range of -10-65 ºC. We also find out that the fan weight is 130g, uses their proprietary magnetic bearing (NanoSLI 2) with the impeller being made out of polycarbonate (Makrolon from Bayer) and the frame being made out of 20% fibreglass reinforced PBT (polybutylene terephthalate). The fan has a rated MTBF of 180,000 hours at 40 ºC (and presumably this number is the same, if not higher, at 25 ºC where most other manufacturers tend to report MTBF values at). To top off this impressive spec sheet, the fan carries a 6 year warranty as well. I am quite pleased to see everything covered here, included input power requirements which I haven’t really seen anyone else cover. So far so good, let’s now take a look at the fan on the next page.