You want the D0 stepping, its good.
If I was you, Id just try and set it and see what happens. Your not really overclocking the RAM if thats the speed it says it can run at on the box. The worst thing that could happen is Windows crashes and you set it back. If you do do it, run
this for a couple of hours and just make sure your system is nice and stable. Let me know if you need more help on this. Remember there are always risks with changing settings in your BIOS though.
I found a screen for you of someone who has it set to 1333 if it helps you. Its the same board as you I think.
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