Re: My hope is that I can replace the rather inadequate OEM fan with something that can push more air, much more than the stock 45 CF/M fan.  Dell actually uses high static pressure server grade fan to push more air out.  CFM is not as a meaningful measure of fan cooling capability compared to high static pressure. Optiplex is not designed as a high heat load pc but if you add powerful video card to make it a gaming pc, try add more chassis fan such as intake fan would improve chassis air flow better than replacing dell oem rear exhaust fan, imo.  [IMAGE]  
I have an Optiplex 7060 with the Foxconn PVA080F12H fan with a fairly ordinary 4-pin plug, as opposed to Dell's often-seen 5-pin plug (one empty).  Here's a photo:[IMAGE] This looks a lot like the pin-out for 4-pin Standard ATX Architecture fans; my presumptions are:red & black are +12V and GND,yellow is RPM feedback,blue is PWM signal.My hope is that I can replace the rather inadequate OEM fan with something that can push more air, much more than the stock 45 CF/M fan. I am cautious about this, since Dell is famous for defying ATX standards with regard to color codes.  Any recommendations?
Optiplex 7060 fan headers