Most likely a G41 mobo will get you to 3.0GHz.
Take a look at some other $500 build(search) and get some ideas. If building from scratch, start with newer hardware.
the CPU are allready at 3.8ghz
all of this parts are from local pc store he has A 550 DOLLAR pc that is corei3 2100 4gigs ram gtx550ti so do i wait or change to
cpu::--intel pentium G850 AND OVERCLOCK TO 3.5ghz or 3.8ghz
mobo::--Gigabyte GA-P67X-UD3-B3 and go over the budget