Performance got worse with new Gfx Card? o.O

[JMC47]

That really makes sense. Dolphin is a CPU intensive application; your new GPU may be low power mode (check the GPU clocks?) and if you go into the NVIDIA control panel, and go to global settings, and set "prefer maximum performance" you can make sure it kicks into high power mode. Even if it does, don't expect it to run hot unless you're cranking up max settings, and even then you're more likely to be hit by CPU limitedness before being GPU limited.