I have a 4+4 pin that plugs into my 8pin cpu 12v. They are bulky and won't fit close side by side. I've tried shaving the sides off and trying to fit it in and looks like I've might have gotten them in. However when I power on I get nothing no fan, nothing. When I have the cpu power unplugged it turns on for a few seconds and turns off. Weird. I have read that a cpu 8pin will boot with only a 4pin but even when I think I've fit both it won't respond at all only when I have no cpu power the fan will turn then shut off