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Some quick questions

Could I xfire my 5770 on my 500w PSU?

I've just used extreme PSU calculator and it says I'm using 355w and another 5770 would use an extra 100w ? and i'd be at 455 with a little bit of head room?

on the calculator it comes out at 415w with crossfire.
 
Okay well I'm gonna give it a shot and have just ordered a mint conditon sapphire 5770 from ebay to go alongside my MSI hawk 5770.

My question is do both crossfire cards need to be at the same core clock/memory frequency?

Currently got my hawk @ 975/1250 and think the sapphire can do 950/1250. Would that be ok, or do I need to bring my hawk down to the same as the sapphire?
 
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