Do you know how to overclock your video card alone? That can produce a decent amount of FPS and still be stable.
Windows+R
regedit
Software > NVidia Corporation > global
right click > New Dword Value or entry, forget what it says.
Name it "Coolbits" no quotes of course.
right click > Modify (set the hex value to 3)
Refresh the registry
All set~
Right click your desktop now, go into your advanced controls for your display drivers and the coolbits overclocking tool built into your drivers will be under a menu.
Here you can overclock your card's core clock or memory. I don't suggest OC'ing the memory because it seems in every card I have tried it doesn't seem to bump performance much at all and/or doesn't work (tearing, artifacts etc when under high load)
Try moving it 5mhz at a time, do anything graphics intensive to test it for a period. Note your FPS here too.
Repeat, increase by 5mhz or so. Test...note FPS.
Continue doing so until the point when you begin to see white spots (usually the first artifact present when card is clocked too high for stock cooling)
Black horizontal lines, tearing, white spots are the most common...if you see any of these, move your speed down until they disappear.
At that point, run something graphics intensive for a longer period if possible. If it doesn't crash, lockup, create artifacts etc... you are good to go