1220 SE is F3, and here only F2 stepping is allowed.

AFAIK any K8 CPU released in 2006 is allowed in this stage, which includes 5600+ and Opteron 1220. I see that F3 chips are not mentioned in the "allowed" list, but the forbidden list only includes 6000+ and 6400+ (I think Opteron 1222 and 1224 should be there as well), which implies that 5600+ ones are OK.

I'll let someone else take a look at this, perhaps the stage page needs to be updated a little.

I allways read rules as if it isn't specifically forbidden it is allowed..

Monster CPU Knopf !