Windows XP vs. Vista vs. 7 vs. Linux

[IceCreamBarr]

Does XP give the same hash rate as Vista and 7?  Is one better than another?

I've read that Linux is better for mining, can anyone quantify that?  Also, to those using Linux, how are you monitoring your video cards?  GPU-z doesn't seem to work, not even under Wine.  I don't need the GPU temp nearly as much as I need the VRM temps and voltages.

[hippich]

you can get current vdc voltage by 'aticonfig --pplib-cmd "get activity"'. But the vrm temps is still a question for me. need to install windows to see if my card report vrm temps at all tho..

[IceCreamBarr]

Will that also give voltages and not only temps?