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Discussion Starter #1 (Edited)
Trying to decide between the dell and hp pfc1212de fans

The HP fans have 11 blades, but only say 3.24 amps.
The Dell fans only have 7 blades, but say they pull 4.8 amps.

I have read that the pwm signal may be inverted for the HP fans, but that doesn't matter to me.

Just wondering which one will push more air through a dense radiator.

I'm guessing the HP is better, and they just list average amps, while the dell lists peak amps?

https://preview.ibb.co/cbh6Uo/1e4s36thssd.jpg
https://preview.ibb.co/m6v4FT/2s34ts3dy5s.jpg
https://preview.ibb.co/dmv4FT/4q4rgsf5dhsd3.jpg
https://preview.ibb.co/hmtD9o/33sdg4syh6js.jpg
 

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Discussion Starter #2
I ordered a couple of each to test, and the HP was delivered today.

My "real" PFC1212de-f00 does 5500-6000 RPM at 4 amps. (labeled 4.8A)
This HP looks identical, but it is not.

The HP is pulling about 2.8 amps, and the RPM signal doesn't work with my mobo.

So to compare I used an Anemometer.

The F00 moves 9 M/S through a BI GTX radiator.
The HP moves 7 M/S through the same BI GTX radiator.

Not bad for $6 each, but I'm hoping the Dell can match the F00
 

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Discussion Starter #3
Dell fans are definitely stronger than the HP fans, but they also have some quirks.
Fans are 3 pulses per rotation instead of 2, so the mobo sees them as 7500 rpm, even though i'm pretty sure they are actually doing 5000 rpm.

They push about 8.6 M/S through my BI GTX radiator, so just under a retail F00.

Biggest problem I'm having now is they have some type of protection circuit that keeps tripping when I hook them up to my radiator.
For example if you run them sitting on a table so they can't move any air, they somehow detect something is wrong and shutdown after they start spinning and repeat over and over.
and having 4 of them on a thick radiator causes the same thing.

I don't think it is over current, because I can see on my dmm they are pulling under the rated 4.8A when they trip.
almost seems like it is a high rpm trip.
 
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