Well I don't know about anyone else but I'm having trouble believing you, care to post some proof?
I two would like to see this, maybe a screen shot of Gpu-z. If it is working in sli then those cards have to be really screwed up.
If it does work in sli the you should see two cards with...
Core clock 915mhz
Ram clock 6008mhz
That is the worst thing you can do since your are slowing both cards down making them both crappy