It's called Proadlizer, and in short it's sort of a super capacitor.
As for making it a 2GB card... we have seen that there's nothing to gain from the additional capacity with a Radeon HD5870, so no reason to go for 2GB ( and raising the card's price more ).
And mostly, this card is aimed at the overclockers, so 1GB > 2GB

I agree on the price though, it could & should be lower than that.
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