0502 do not like my RAM as 0501, 4:5 and 5:6 divider won't boot still exist no matter how low FSB is.

While regarding the issue of CPU Q-Fan do not work, finally I realize that P5E Q-Fan only support PWM Fan

I installed Intel OEM 4-pin PWM CPU Fan and it works very well. But if Asus supposed to do this why don't they mention a single word in the user guide to let their customer know about the limitation? And it's also quite odd if Q-Fan can control 3-pin Chassis fans but leave CPU fan alone.