I am helping a friend upgrade his rig. He has a p5b rev1.04g mobo and an old cpu, he wants to buy an q6600 or something like that. He is afraid that modded xeon cpus(something from aliexpress) won't post because of fsb or something. Can we use a modded xeon on this mobo? If yes, which one would you recommend that are preferably under 20 dollars?