Vietnam1,  The 15TH9 board was the first generation of motherboards for the T110 II. The PM2CW was the 3rd version of the motherboard released, which added IvyBridge processor support.  Let me know if this helps.
hi there are two motherboard part no's -is there a differnce if so what are they? thanks part no 15TH9, 015TH9 part no  PM2CW, 0PM2CW
Dell PET 110 II new motherboards