You need to be careful, and don't forget the wire ordering. It is possible to release the metal wire ends from fan plugs, and to reuse those. If you choose to harvest the white 5-hole plug end from the HP fan and use it on your Noctua 4-wire fan then you'll need to add in the ground jumper wire assuming you are using a hotter processor. You might even be able to harvest the original fan and use it on the Noctua heatsink. I'll assume you'd only be using a hot enough processor to require a Performance HP original heatsink/fan. A lower capacity 'Mainstream' heatsink's fan in the Z400 and many of the other HP workstations will have the same white 5-hole plug end but the jumper wire from hole 1 to hole 5 will be absent (and hole 5 is empty). Normal PWM wiring is pin 1-4: Ground, +12VDC, RPM feedback from the fan over to the motherboard, and finally PWM control signals from the motherboard over to the motor controller. You can use that plug on another PWM fan (your Noctua) and jumper wire it like the HP one is and the motherboard will think it is a HP Performance fan.Ĥ. If it has holes for 5 pins and a jumper wire from pin 1 to pin 5 it is the higher capacity fan. You can tell if you have a 'Performance' heatsink/fan in your Z400 by looking at its heatsink fan's white plug end. Brute force of a hotter-running cheaper single processor could be applied to the Z400 given it only has one socket.ģ. What processor are you running or planning to run? For the Z400, both versions, they usually ran hotter processors than the more expensive cooler-running ones in the Z600 because the Z600 had to be engineered to be able to run/cool two processors. Is your Z400 a version 1 or a version 2? The version 2 is what you'd want to have and it has 6 memory slots instead of 4.Ģ. Here are some questions, and some answers:ġ.

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