for help with part of the question:
x86 code on Intel Xeon Phi
The second point is that Pentium-I is an old simple architecture, that deliver usually less than 1 Instruction Per Cycle (IPC), while actual Ivy Bridge delivers nearly 3.5 IPC.
funny how a seemly unrelated article will give an answer.
but to then speculate on the amd side lets use the 3.5 IPC and see how it compares to a FX chip in a synthetic benchmark.
so 4189/5483= 76.35%
3.5*.7635= 2.67 IPC
so an ivy bridge cpu has an IPC of 3.5 and a bulldozer is 2.67 (and i am not going to say that is 100% correct)