I assume with the same resolution in Dolphin, it doesn't matter what their native resolution is. Most PAL games have the option to run in either 50 or 60 FPS (25/30) While NTSC can only run in 60 FPS or 30 FPS (depending on game). So actually NTSC would require more, though this difference is reduced with frame skipping anyway.
Specs: intel i5 3570k @ 3.4GHz;
16Gb RAM; Raedon HD 7900;
Win8 64-Bit
16Gb RAM; Raedon HD 7900;
Win8 64-Bit
