i've tried overcloking my q6600 B3 with mobo gigabyte EP45-UD3L, this is the setting i've tweaked in bios:
CPU clock ratio - 9x
CPU Host Frequency - 333
Performance Enhance - standard
System memory multiplier - 2.00D
CPU voltage control - 1.35V
Dram Voltage control - 2.0V
PCI Express Frequency - 100Mhz

i'm using corsair 2x2gb ddr2 memory card, 5-5-5-18 @ 400mhz, so did i tune correctly for the system memory multiplier? i've successfully overclocked it from 2.4ghz to 3ghz, max temp during gaming around 60c, idle 48-52c

nothing about correct or not ... it depend wat core spd u wan and it is stable ~~try use sum software to test ur proc in 100% load in 3 days or more then tat ~