I now have 252" running at the stock 2.6ghz. I am going to upgrade this week. Would you guys go with 254's or 275's dual core? The 254's run at 2.8ghz, that's dual FX57's or the 275's run at 2.2ghz but with 4 cores running at 2.2ghz? I don't know what would be the better cpus to get.