Hmm i get with 1x i7 2600 on ariocppminer 0.9.6 avx around the 8.5H/s with 6 threads.
i dont remember what chipset the xeon is using, but are u on DDR2 ram? It looks like this coin wants fast ram memory also.
Just for reference, I have the same configuration (with 0.9.5 avx) and with 8 thread in relaxed mode have the same results (i7 2600, 8.5H/s).
With JavaMiner can't go over 6-6.5h/s (but haven't tried to tweak it, if it's possible)