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Yeah man I read your post..
I was wondering about the memory difference. Like I read in one of your other post saying people need to remember that adding two cards together with 512 me doesnt mean you have 1gb of memory. So I wondered how 1gb would do compared to the 768mb Nvidia cards. Is it just overkill.

Does the release of the 8800GT change anything on deciding between 2 8800GT's vs. a single 8800GTX?

Most likely...

Like what?

Early testing shows the SLI GT outperforming consistently the GTX (Which is double the price), but we have to wait and see if a price adjustment occurs in the upcoming weeks before you jump into any conclusions, for the GT, GTS, and GTX.

a single 8800GTX costs a little more than a 2 8800GT in SLI, and it consummes less power ,less heat and also more memory , however in games that benefit from SLI, 2 8800GT beat a single 8800GTX

Single GTXs can be had in the US for $450-470, so it's not always more than twice the price (especially not with the current GT price gouging), but when compared to the Ultra, once again you get into a 2+:1 price ratio.

Hi, I have a small question.

when you go sli it's better to have the same card two times or it's possible to have cards coming from different company. I already have a evga 8800gts 640mg superclocked and want to add a second one. But I find some whith a lower price and it's not evga. Can you tell me if there some problems you know could happen from the mixed up of two card.

thanks
sorry english is not my first langage.

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

Can I mix and match graphics cards with different sizes of memory?
While it is not recommended, NVIDIA does offer this flexibility using Coolbits. When purchasing a second graphics card, you should try to match the memory size so that you are ensured full value and performance from your purchase. For example, if your first card is a GeForce 6600 GT with 128MB of memory, you should purchase a second GeForce 6600 GT with 128MB of memory. However, using Coolbits (value set to 18), you can force both of the cards to use the lower of the two memory sizes and operate together in SLI mode. When dissimilar memory sizes are enabled to work together using Coolbits, the effective memory size for each card becomes the smaller of the two memory sizes. Instructions to enable this feature can be found here.

Can I mix and match graphics cards is one of them is overclocked by the manufacturer?
Yes. A GeForce 7800 GTX that is overclocked (for example BFG GeForce 7800 GTX OC) can be mixed with a standard clocked GeForce 7800 GTX

http://www.slizone.com/page/slizone_faq.html

Thanks for the information

I have two of the same model X1950 Pro's 256 MB working together. Neither is branded as a crossfire edition. The two that I have are made by Sapphire. This may not be the case for all X1950 varieties out there though.

thats strange, but thanks you told me, i will edit my post

Thanks for all this info - really helpful but still a bit confused.
I have just upgraded to a Asus mobo as it has 2 PCIE slots which both run at x16 as I want to go to crossfire later- the manual says that the board supports crossfire. Does this mean I don't need a crossfire version of the second graphics card and can just buy a second "standard" card which matches my current one?