dont buy vs or cx series of Corsair...Cheap construction. Go with a seasonic or Silverstone or Corsair HX or AX series.
Most PSUs have 8 and 6 pin or they have 6+2 which can be used in 6pin and 8 pin configs. The extra 2 pins will most likely get in your way when trying to plug into a 6 pin. I suppose you could cut the end 2 off but I wouldn't recommend it seeing as most PSUs have ability to cover both options.