I have a factory OCed 8800GT 512, and I was thinking of buying another, but I can't find anywhere the same exact one that I have, or at least one that has the same engine and memory speed. If I buy one that has a lower speed on the engine and memory, will they function in SLI? Will there be problems?

Yes

Sorry, Yes you can sli a stock clocked and an overclocked card together.

So I only have to make sure that the chipset is the same and that it's from the same manufacturer?

This is a very good explanation from another forum member and should answer all your questions.

http://www.tomshardware.co.uk/foru [...] sfire-faqs

What about brands ?
Well the brand doesnt matter , again for example , you can use a XFX card with a EVGA card , or a SAPPHIRE card with a DIAMOND card , just make sure they have the same memory and same clocks.

What will happend if 2 cards have the same amount of memory but one has higher clocks than the other?
One of the best ways to learn is to make examples.
You have a 8800GT(Normal edition,no OverClocks) and you want to add another 8800GT(Which is OverClocked),then:

1_The OverClocked one will lower its clocks to reach the Non-OverClocked card.

2_You can OverClock your card(The one that has Stock frequencies) and reach the OverClocked card.
Remember, you cant ALWAYS OverClock the normal card to reach the other card,because it may not OverClock that much and may become unstable.

WARNING:There are many exceptions in Computer Hardware, for example "Mousemonkey" a member of this forum has told me that when he puts his ASUS 7900GT card (Which is at stock speeds) with a XFX 7900GT(A OverClocked card) the ASUS one raise its clock to reach the XFX one which is an exception and as i said exceptions are alot in Computer Hardware.

Mactronix

Thanks, mac.