Perhaps SME 5.5 would be better at detecting processor boards? I know basic RH7.2 does it properly, it's just the SME install that probably needs something updating. If the install process had an option to _force_ dual processor support then I am sure it would work fine.
When I finally get 5.5 downloaded (six attempts so far, and getting timeouts after about 250M) I'll give it a go.
Ta,
JJ