Hello,I have an optiplex gx620.I have installed a Dynex 600watt PSU which has the fan blow over most of my motherboard(downward).I have also installed an ATI visiontek 1gb 5450 video card. Can I power a small cooling fan from this card , which I will mount to the rear of the case to pull out more air.Will this work without putting a strain on the card therefore shortening its life?