SLI doesn't seem to work in D:OS currently (it didn't in Divinity 2 initially either) so you're relying on just one 650m. For comparison, I see 40-45fps with 2x580GTX (effectively one thanks to no SLI and with all settings maxed out) at 2560x1600, so your performance figures don't seem that far out of line.
Performance will likely improve (previous patches have already helped with factors like save times) but if you want a smooth, bug-free game from the outset, put D:OS aside for a couple of months. Once you come back to it, things should be much better.
Edit: Might be worth checking your power settings - even without Optimus you may find your GPUs being downclocked if you haven't enabled maximum performance.
Last edited by Stargazer; 16/07/14 04:55 AM.
