Luke-N 5 My computer only has one 4 pin port to allow for 1 fan. With this cord I connected one 4 pin fan and this other 3 pin fan to the splitter. Works perfectly.They sent me 3, (I thought it was just the one, so I ended up hooking up my wife's pc as well with the same setup. Now have 2 new shiny bright blue fans up and running! Great attachment piece! *A little stiff putting it in the computer slot though, so take your time and be careful, attachment cables were really easy/smooth to connect.