I bought Dell workstation T-7500 with Xeon E 5645 2.4 GHz with other configuration like RAM, HDD, Win-7, etc same as Dell XPS 8300 desktop with i-7 2600K 3.4 GHz But I am finding that workstation seems slower than desktop. So is it the processor that is slow or something else ? Percentage wise How much slower it should be ? They want extra $ 500.00 to upgrade to Xeon X5650, 2.66 GHz. Would that be as good as i-7 2600K 3.4 GHz or better?