16KB L1D (down from 64KB in K10.5), only 2 ALUs per integer core (down from 3 in K10.5), longer pipeline... compensated by some op fusion, better prefetching & branch prediction, but: pretty clear now that the single- (and therefore low-) threaded integer IPC is NOT going to make a huge jump from K10.5. I'm not sure it will match Nehalem, even- might be close. SB should be well in the clear.