Gonna get new RAM soon ?
This is some good stuff:
And of course Newegg has the G.Skill HZ kit (DDR2 800), and the Crucial Ballistix. Anything Micron D9 should be good overclockable RAM (upward of DDR2 1000 speeds, thus an FSB of 500MHz is possible with those types of sticks at 1:1 with the CPU).
Not sure how that specific board of your handles... I just running a vcore of 1.4V, a vdimm of 2.2V (stock for my Crucials), the Northbridge voltage maxed out for my board. RAM at DDR2 533 speeds (1:1 with CPU), and an FSB of 340 MHz. This results in 3.4GHz for the CPU (not 100% stable, I know I need more volts for this E6700 stepping). with the E6600 I had an FSB of 375MHz (3.375GHz) stable, and 390MHz (3.51GHz) with trouble. This likely is the limit of the CPU on air (not a great week)