Just a quick update.
I ditched (well, RMA'd anyway!) my DS3 and replaced it with an Asus P5B, and although I still can't get anywhere near others clocks, it's a transformation for me!
I've had it as high as 386FSB with just a smidgen of voltage to the DIMMS and CPU. I think my RAM is holding me back now though, and there are no dividers in the bios.
I've got it set at a stable 2.2Ghz now with all voltages back at stock, which is a modest OC but that was always my aim really, as I look at it like having a 6400 for the price of a 6300. (I know it's only £30 difference, but hey, every little helps as they say!)
I know others are having great success with the DS3, but for me this board is a whole different ball game. Just booted up, made my changes and away she went! No nonsense like not saving the settings etc.
Good little board I reckon.