915P/G combo and DDR2 overclocking

If anyone here has experience overclocking with DDR2 and this board, I'd appreciate some advice (if you have anything that may help save me some time/effort).

Been reading up on why it seems I can't get past 215mhz bus with either DDR or DDR2 ram. Appears there was originally an overclock-lock on the 925 and 915 chipsets, and certain manufacturers have disabled or worked around this. MSI being one of them. BUt HOW to use their work around seems to be my main issue.