What I don't understand is why it didn't come pre-loaded with the i5-520UM.
http://en.wikipedia.org/wiki/List_of_Intel_Core_i5_microprocessors#.22Arrandale.22_.28ultra-low_voltage.3B_32_nm.29
Its $48 a box of a thousand cheaper, it has only 8 more watts total thermal envelope, and with the built in turbo technology it will bin up to 1.6 gigahertz with both cores still active. Add in that its more powerful clock for clock, and its a better processor than the SU4100 and SU7300.
The i5's for mobile machines were announced at CES this year just like the M11x, and Dell had to know that the i5 would be available long ago (if manufacturers didn't know that the chips were coming out in advance, how could they come to market so quickly with them, HP and Sony had i5 stuff on tap within weeks of the CES announcement).
So, again, why are we having to live with the SU4100 and SU7300 again?