NTSC (North American/Central American/Japanese) is 60Hz with 525 lines per frame. PAL (European) is 50Hz with 625 lines per frame. PAL transmissions are 50Hz interlaced, meaning 25fps. PAL also auto corrects color errors, unlike NTSC which leaves that up to the TV user. Newer PAL sets have higher refresh rates so the flickering is almost a non-issue. Regardless, the differences between PAL and NTSC are not as big as the differences seen in monitors which must have picture drawn on them by varying external video solutions. All 360's and all PS3's will have the same kind of GPU.