I have used GC/PSU fans(as CPU cooler)for a variety of reasons,with never any trouble.(only on my "spare" PC,which is a testbed for OS/hardware,etc and if the experiment fails and the hardware dies,no great loss)
The fan in the link is specifically for MOBO chipsets and the primary fixing method with that example is double sided adhesive thermal tape. As you can see if you look at the range of VGA card fans click here they usually attach to the graphics card circuit board using clips that fit through a couple of locating holes. As such the Akasa cool blue is not the same as the unit you have. But if your MOBO has mounting holes next to the mobo fan, of the same size and spacing as the graphics card then you may be able to swap the existing fan for the card fan. I don't think that the operating speed will be a problem IF it fits properly, as many MOBOs have smallish passive heatsinks on the chip and a graphics card fan unit should be more than adequate.