Gtx 470 sli

pretty sure you can't sli those. must be either 2 450s or 2 470s. you could run the 450 as a physx card though (but it won't improve performance in non-physx-utilizing games) but i wouldn't do that if you haven't bought them yet.
 
You cannot SLI a gts450 and gtx470.

Just get two gtx460 1gb's, you'll spend the same amount of money as a gtx470 and gts450.
 
Off topic, but the op's name always makes me hungry, sorry for the useless post. But yeah, you can only SLI 2 of the same model of Nvidia cards, with ATI you cn get away with doing Crossfire on some different models, but it will always scale down to the performance of the slowest card.
 
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