overclocking cooling pad fan speed

[toroloco75]

I have the trust gxt 277 notebook cooling pad with a 20 mm fan, but it seems it does not change much the pc's overall temperature (cpu and gpu).

So I know these are supposed to be connected to a usb port with an output of 5V@ 0,50 A.
I found a powersubbly with an usb cable attached from another device and hooked it up to the cooling pad.

The output is 12V @ 1,5 A.

The fan runs quite a lot faster and this does affects the temperature of my laptop.

My question is, is this safe? should I be doing this or will the fan 'burn out'?

 

[popatim]

Its designed to run off of 5v and running it off of 12v would certainly make it spin faster. Can you see the fans label to see if its a 12v fan?
I Would not plug another device into the pads other USB port