I have Power Supply and Motherboard from HP Z420 workstation. I bought a case for it: Corsair 275R. The problem is that HP's PSU will not fit there at all and even if it did, the CPU cable would not reach the top of the motherboard where it is supposed to be plugged. So I have a new PSU: Corsair VS550. The problem is that ATX and CPU plugs are different on HP's power supply and Corsair's one. See attached pictures. Does it mean that HP is custom that I won't be able to get PSU for that motherboard or I can't use that specific Corsair I have and have to get something else? or am I missing something else?