Hello everyone.

My english could be better, but I hope it goes.

My problem is that I have a Dell Optiplex 745 USFF with 2.6.6 bios and a Optiplex 755 USFF with A22 bios. So they are both bios updated.

I have heard a lot about that the Dell USFF cant run Quads processors over 65W because of the external power brick on only 220W. But i thought i will give it a try, so i did buy some cheap quads (Q6600, Q8400)

First i tried the Q8400 in my Optiplex 755 USFF, but It just keep going spin up and off, spin up and off with yellow light on the power button. Then i tried the Q6600 also in my 755. it did boot up, but says: incompatible processor ..

Then I tried the Q6600 in my 745 USFF. It boot up and run great? I have not tried the Q8400 in my 745 because I know it cant run 1333MHz processor.


But why do my 745 USFF work with Q6600 when my 755 does not?

i prefer using the 755 because of higher ram and cpu speed.

Regards