1333 motherboard means an FSB of 333 MHz. I have a GA-EP35-DS3P that was rock solid at 400 MHz with a Q6600. System was stable at 3.6 GHz. when tested with a 24 hour Prime95 run.
Currently, it's running at 425 MHz with a Q9550.
Currently, according to your parts list, the limiting factor is the HSF. I would not go any higher with the stock cooler. And youtr RAM timings do not look that good.
When you start going for a max OC, you need to balance applied voltages and temperatures.