1.) Go to the following link and download the Nvidia 3D Settings Profile Manager:
http://www.geeks3d.com/20100528/manage-your-sli-profiles-with-nvidia-geforce-sli-profile-tool/...
2.) Export your current SLI profile.
3.) Open the document it exports, and scroll down to where Sleeping Dogs would go.
4.) If there is no entry, copy and paste the following:
Profile "Sleeping Dogs"
ShowOn GeForce
ProfileType Application
Executable "hkship.exe"
Setting ID_0x00a06946 = 0x0C4010F5
Setting ID_0x1033cec2 = 0x00000002
Setting ID_0x1033dcd3 = 0x00000004
Setting ID_0x10ecdb82 = 0x00000001
EndProfile
If there is already a profile, make sure the the first line of code says "Setting ID_0x00a06946 = 0x0C4010F5" and not "0x004010F5".
5.) Save the profile, and import it back into the 3D Settings Profile Manager. Now you're done! This isn't a final solution, Nvidia still needs to release an official driver for this game. This simply allows my second GPU to work. And, furthermore, I've never seen my FPS monitor from DXtory ever drop below 60.
Quick note: I've received a few messages about an official nvidia release(actually a beta driver, but whatever). I tried it out, and got 5 less FPS on 3 attempts with the benchmark. The profile numbers are a bit different, so I'm sure it has to do something with it. So this fix still works better for me. I also received a message about this being low FPS for a 690, with a screenshot of their benchmark using an AMD card. Well considering in the opening for the game, theres an AMD splash screen, which company do you think was ready for an official release? Just sayin.