if the game has been optimsed to make use of the processing power of both d cores then obviusly dual-core is wat u shud go 4
but if it is not then
AFAIK there will be no noticable difference in performance
if u plannin on runnin other appz like AV scan, photo-editin then again dual core is waht u shud go 4
but unless u got dual-monitor/keyborad setup, dont c u doing phot-editing and gamin @ d same time
basically d
other core will take the load off the core that is being used for gaming
but if u r just gaming @ a given time then there will not b any diff