the best way to oc on memory 680, in my opinion, is to set the right divider in bios with unlinked. boot with a low fsb and memspeed and then push it all up in windows with clockgen.
you need to know the target fsb and target memspeed, then calculate the memory divider, then set the right divider with a low fsb and mem speed in bios, boot and increase the fsb. the memory mode is called unlinked but the ratio is actually locked. so when you increase the fsb the memspeed will track with it.
this is a great way to avoid straps and other timings problems and especially those nasty bios holes in 680 bioses.
i didnt calculate all dividers, only the ones interesting for around 900-1000 memclock with cas3, but you can extend the table easily if you know how to use excel. in case you do, please post it on xs again to share the knowledge with others
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