Don't know if you realise mate but your dual xeon (sr2?) machine isn't running the optimised app, your other machine is. There is an OSX version if that's what you weren't aware of.
OSX 64bit SSE41:
Code:http://www.boincunited.org/opt_apps/denis/denis_1.05_x86_64-apple-darwin__sse41_v3.zip
I know, I didn't have time to get the optimized app installed in OSX plus I have no clue where to put it anyway. Can't even find the BOINC folders
Hate macs
Got two more machines coming online today