8800GTX and 8800Ultra SLI Question

I was wondering if anyone knew wether or not a 8800GTX and 8800Ultra can be SLI'd together. They will also be different brand cards. I am thinking I may just try it here a little while but was wondering if anyone had any success trying this? Obviously the 8800Ultra would scale it's performance down to the 8800GTX.

For those who pose the question as to why anyone would do this..... The reason is simple, I have an 8800GTX and a friend has an 8800Ultra. The Ultra is basically an overclocked GTX, they are the same family GPU just higher clock speeds. Nvidia states you can SLI a factory overclocked card with a non overclocked card and it will scale down, but when I replace my video card in the near future (Assuming the new line of cards do come out) my friend may be interested in taking my card for SLI for the right price.

Sorry for the long post, just wondering if anyone has tried this yet. I don't have a real easy way to just try it until he brings his machine over again. Thanks in advance.

hmm... its a good question, but I suspect (don't quote me) that it won't work

Basically different clocks higher voltage better cooler and better memory chips found on ultra.

But id still say no, because the drivers will see them both as 2 different cards.

Thank you for the info so far. I think I may try it anyways. Just need to see if the two of us can get together any time soon so I can post the results!