Unlocked multiplier isn't a big advantage - even e5200 has 12,5x so on 333 FSB you've got 4160mhz. The problem is that, your chip may need 1.4-1.5v to daily 4ghz. I'd say that they're comparable, e7500 would be slightly better. I've got e5200 which can do 4,1ghz on 1,32v real and it's better than most e7xxx chips I think (for daily use).