I think they're not doing a "UT" because is costs more to make and does not
sell as well. When there are "similar" (read identical) boards come out at the same time (like M2R and M2Rs) most people buy the m2rs and DFI needs to make money.
Also I think (many would disagree ) that the M2R was an overkill
in terms of the kind of power it can handle
Besides SB600 and SB750 is "pin compatible" is it not?
Who knows maybe some one can flip the SB's and mod the BIOS, and
make it XSTREME