Fair enough, thanks for the feedback. I'm starting to come to that conclusion as well as I've never been that far above this fsb on this chip. There's an E8400 I can try this with so will take that home tonight and see what it's got, although they were purchased around the same time so not getting my hopes up too high. I can post at around 625fsb but no hope of entering windoze on it. Thanks for the feedback though.
I also noticed you can't disable multithreading on the E8x00's but on the E4600 I could which left it running just 1 core and allowed me to put more volts into it (managed to still comfortably run up to 1.8v on it).