Xbench is a joke. It does not benchmark anything in regards to real world speed. It is woefully innacurate as well not to mention oudated as it has not seen any major update in about 2 years. The Score system it uses produces almost meaningless numbers. Xbench cannot account for Dual Processor Performance, Can't even identify Hardware specs accurately, cannot give any meaningful GPU scores etc etc.
Wait for Xlr8yourmac.com, MacSpeedzone.com, or Barefeats.com to post more accurate realworld benchmarks.