Finishing a budget gaming rig over hear, I have an athlon 440 cpu paired with an asus 785m, 785g chipset motherboard. For a gpu I'm planing on adding a 5850 or a gtx 470. Will there be a huge bottleneck? Or, with a budget of 300 dollars, will it be better to swap cpus for a phenom 955 x4 and get a 5770?
an oc to what? is 3.5GHz good? Will I need an aftermarket cooler?
You can get a moderate overclock on the stock cooler but specific GHz is hard to specify since 2 of the same CPU might not overclock the same. A good after market cooler usually allows for higher overclocks you can look it up in the overclocking section http://www.tomshardware.com/forum/forum-29-179.html