Dumb question: What is the differences between a UD3R or UD7 (and other MB's in GB's 1366 lineup?) I have 2 UD3R's and a UD5 but I can't really tell any differences in them, specs look about the same and it seems like the ud3r and ud7 differences are all in the PWN system and the cooling. UD9 has upgraded PWM vs the ud7 and nf200 quad sli and an astronomical price tag (thats an easy one to tell the differences )