metal bracket used on Globalwin's units as the advantage of
being adjustable up and down. You can also slide the fan(s)
toward the front or back of the case. This allows much more
accurate adjustments relative to its position. The CAF12 comes
with two metal grills, but neither of the CBF32 or the Card
Cooler have these grills.
The CAF12 was also the one that made the least amount of noise,
probably a result of using only one fan. On the other hand,
the CBF32 was definitely the loudest of all.
CBF32 and CAF12 both cost around $20. The Card Cooler sells
from $20 to $25 depending on the model you choose.
CBF32 is the least powerful, but also uses more power, and makes
more noise than the two others, so I would not recommend it.
I really like the two others but I think the CAF12 has an edge
over the card cooler. It has grills, lower power consumption,
less noise and it's cheaper. Either of these two units is great,
and neither will void any warranty. Thanks to 2cooltek
for the card cooler sample and to GlobalwinUSA
for the two others.