As i understand it, westmere is supported by rev 1.2 and the rare 2.0. if you have the rev 12 show up, that isnt rev 1.2. rev 13 is. you still have to do the mod to reach rev. 13. My 3x sli shows the same cpu-z yours does except with rev. 13. and a date of 8/25/2011. Had to do my research, I just bought a x5677.

so does it go straight FF or can you boot into windows? if straight to FF i would check your ram, the first gen IMC was a bit picky to which slots and how much ram you had along with speed and timings. which slots are you using, what are your ram settings. have you tried clearing cmos