power used by just the fan in a power supply?
 

I heard at a HPC presentation that the fan in the power supply of a 1U server
"pizza box" can draw 15-20 W! I looked up the specs of some 40 mm case fans used
to cool CPU, DIMMs etc and they were in the range 4 W to 13 W. So I suppose
15 W is plausible.
On the other hand, the larger case fans in a desktop PC need only 1 to 2 W.
So would it be reasonable to assume that in a desktop power supply, the fan
is roughly 2 W draw also?

power used by just the fan in a power supply?
 

power used by just the fan in a power supply?
 

On Sunday, April 7, 2019 at 9:35:33 PM UTC+8, Paul wrote:

It should have the power rating printed on the hub.

My Vantec Stealth in the kitchen says 1.2W on it.
12V @ 0.1A. That's roughly the class of fan inside
an average power supply.


I had already looked at 3 PCs before my original post. One, an Antec only has
some numbers that look like a date. The other 2 power supplies (Coolermaster
and Chinesium) have no sticker on the fan hubs.

power used by just the fan in a power supply?
 

power used by just the fan in a power supply?
 

Paul wrote:
wrote:
On Sunday, April 7, 2019 at 9:35:33 PM UTC+8, Paul wrote:
It should have the power rating printed on the hub.

My Vantec Stealth in the kitchen says 1.2W on it.
12V @ 0.1A. That's roughly the class of fan inside
an average power supply.


I had already looked at 3 PCs before my original post. One, an Antec
only has some numbers that look like a date. The other 2 power
supplies (Coolermaster
and Chinesium) have no sticker on the fan hubs.

Failed Antec True330

Bottom fan: 12V @ 0.25A 92mm square
Rear fan: 12V @ 0.20A 80mm square

Both have labels on the hub, inside.

Paul

I have a couple Enermax, one with 12V @ 0.17A showing
on the 80mm fan label on the back. The other has
a 12V @ 0.26A fan. I can't see the details on the
other fans on those.

Paul