My a1200 is a Escom (AT) a1200 Mother board rev 1d4, i have never had any problems with timing or any of the other rumours. (Apart from the Floppy problem, but my a1200 is now 1/2 way into a tower so i dont use FDD's no more). I agree tho, get the one with the best price, with kick 3.1 roms in it =oD