The LNA (generally the RC7) reduces 12VDC to about 8.5V, while the ULNA (generally the RC6) reduces 12VDC to about 7.3V. I've always added a NA-RC7 to the front PCI fan in the earlier HP workstations, but with the Z600 and Z620 HP started using some front fans that are quiet as is (the lower amperage Nidec instead of the higher amperage Delta). On the Z600 and xw6600 there is a small too fast northbridge heatsink fan that I always add a NA-RC6 to, and it is a perfect fit because it uses the standard PWM plug type, and that fixes a major source of unnecessary noise in those two workstations. Google noctua LNA and noctua ULNA for added info. Noctua sells a 3 pack of the NA-RC7 as NA-SRC7. The NA-RC6 have been harder to find but I recently got a stash off Amazon. The later workstations from HP have been better in noise control. So, you need to be willing to fiddle to change things around using this method to a lesser or greater degree. Some are more complex with two fans being run off of 1 plug. Some use 5 pin plugs wihtout or with a pin 1 to pin 5 ground jumper. some use 4-pin plugs with no central standard ridge. Some HP fans use 4-pin plugs with the standard type of white PWM plug morphology. The RC6 has a higher rated resistor (thus, slower baseline RPM results) and the RC7 a lower rated resistor. Noctua has a number of these, but pretty much the only ones I use are the NA-RC6 and NA-RC7. The fan'r RPMs are reduced at its baseline, and the same % PWM speedup or slowdown gets applied from the motherboard as if the fan was receiving 12VDC. All the rest stayes the same, and thus the HP motherboard control of the fan stays proportionate. The Noctua fan speed reducers simply add in a high quality resistor onto the 12VDC line so the voltage getting to the motor is reduced. The way PWM fans work is that they have 4 wires with pin 1 providing ground, pin 2 providing 12VDC, pin 3 sending motor RPM feedback info, and pin 4 receiving PWM throttle signals going out to the motor. Let us know once you figure out the 2 x 4 = 6 pinout. I went back to using the HP fans, and I fine tune them as needed with the Noctua RC7 and RC6 4-wire fan speed reducers. Speed up the too slow Noctua fans via BIOS? Good idea, and you'll boost the Noctuas nicely but also boost the other non-Noctuas too, too much. Put in a slow Noctua and give it the HP PWM braking and it will go from slow to too slow. The HP PWM control is embedded in the motherboard's firmware. HP fans are designed to run very fast if they receive 12VDC and no PWM braking. Example, and why I tried and gave up on the idea: Noctua fans are designed to run relatively slow to begin with. Replacing one set with Noctua will imbalance your system. Now, why even do this? I very much like the Noctua hardware but the problem with your idea is that HP has carefully balanced all of the fans together. Two wires out of the 8 total are bonded half way towards the plug end, and you just need to dissect a set to figure out which wires they combined. HP PWM 4-wire fan pinout is always ground, 12vdc, rpm sense, pwm control for pins1 to 4, and there may be a ground jumper from pin 1 to pin 5 to tell the motherboard the fan is part of a "Performance" heatsink/fan.Įach of the bonded pair of fans for the rear exhaust kit has its own 4 wire output, but they end up leading to a single white 6-pin plug end. Note the Delta draws more amps and thus might run faster and louder.
#3 & 4 pin fan pinout code
so if you look up the manufacturer's code on the fan you can find other HP fans that use the same code as a single 4-wire fan. HP has used the same fans with different part numbers. There is either a set of two Delta or two Nidec fans that make that kit up when combined with the black plastic dual fan holder (which will have its own part number embossed on its surface). Looling on eBay for "Z820 rear case fans" shows that the dual rear case fan system HP has designed for the Z620/Z820 is comprised of two 4-wire PWM controlled 92x92x25mm fans with fan number 644315-001.
0 kommentar(er)
