I'm on a Q9550 and your same exact motherboard.
Tips:
Add a redacted little fan to the Northbridge Heatsink, don't skip over this step, do it. I found one from a Pentium 2 that fit. Or just ziptie something blowing in it's general area, makes a huge difference, just try touching it with your own fingers if you don't believe me.
I can get it up to about 3.2Ghz, no more, I've redone the bios settings from scratch dozens of times over the years, it really doesn't matter, 3.3 was unstable, forget 3.4
2 sticks of ram is more stable than 4, but I eventually got it going fine with 4. Also seems like the northbridge heats up more with 4 than it does with 2.
Edit: If you're not using spare parts and are actually spending money on building this system, and you don't live in the third world: stop now. Although to my own surprise this board is still trucking along after all these years, I feel like it's slowly "decaying" and becoming unstable at certain settings, so I gradually have to lower the clocks and undervolt it more and more to keep it usable.
I guess I'm typing on it now and it still works and runs apps and even Arma 3 ok, but uhhh, shit's old.