yea 513mhz on the core is sweet dude, thats 10260 texiles per second lol zooom! i mean seriously especially with stock cooling. i would also go with the zalman vf700-cu maybe pull like 525mhz out of it, and im wondering how those 512mb bfg models are pulling 580mhz! i doubt its the cooling i mean im sure it helps alot but some chips will not do but so hi they must have binned abunch to get 580mhz, thats proubly why there hard to get for under 700$