Originally Posted by sQuetos
Would you rather buy the semi modular 620w M12II or XFX 850w theres only a £15 difference, sorry for so many questions
The 620W M12II is an old PSU and it only has 2 x PCI-E cables: 1 x 6-pin, and 1 x 6+2-pin (it can be an 8-pin or a 6-pin). A good 850W PSU with your system would also have a lower average efficiency and the small power draw wouldn't be good for it either. It's kind of like owning a nice car and never taking it above ~40 MPH. It's good for a car to be taken to high speeds on a semi-regular basis.
What store are you looking at?