A quick look at the indispensable CPUbenchmark shows that Bay Trail-D processors favorably compare to 65W Core 2 Duo chips (and to Ivy Bridge Celerons as well). Performance of the quad core J2900 should be very interesting.
Source: CPUbenchmark (2, 3)
Update: With 3 samples, the J1850 passmark is now 1614 (it's discontinued anyway). The J1800 is 1179, the J1900 is 2006, and the J2900 is 2169.
