SLI

No, the cards need to be the same, 8800GT with 8800GT, brand doesn't matter so long as you get two cards with the same clock speeds. So don't go get a stock 8800, and then an eVGA super clocked 8800.
 
No, clock speed doesn't matter, since that is just an overclock.

If you have 2 cards with different clock speeds, put the higher clocked one on top, and the other one will automatically jump to that speed.
 
No, you can't mix a GT and a GTX; they're very different cards. You can mix that Zotac you linked to with another 8800GT. As other replies have stated, if the model is the same, you can mix manufacturers and clock speeds if you need to.
 
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