> Ivy Bridge Core i5 3570K @ 4.22 GHz - 130.65% average, attract mode with sound
Which version of MAME are you using, and what command line settings did you use? It would be interesting to see a direct comparison.
I found some benchmark info here on the forum, which led me to use this command line on MAME 0.159, 32-bit:
mame cybrcycc -bench 90 -verbose > bench.txt
Result: 183.52% on an i7-4790k 4GHz.