![]() ![]() pin swapping)? I definitely don't want to "babysit" the computer and manually change fan speeds with that additional controller. Is this because the fan isn't actually a fully compatible replacement, or did he do things differently from what is described in this thread (i.e. I noticed that the video shows that "Macs fan control" displays the fan with a speed of "0 RPM" because it apparently doesn't work as a direct replacement for the original fan and he had to use a Noctua fan controller. Is there a reason I shouldn't choose the NF-A8 PWM? According to Noctua that model flows more air and spins faster than the "Redux-1800" above. I believe I read somewhere about using the Noctua NF-A8 PWM as well (forgot where. ![]() Noctua NF-R8 Redux-1800 ( posted here and here) Sunon KD1208PTB3 ( rewired, posted here, but this isn't a PWM fan, is it?) I've picked up from this thread and other places the following fans being used to replace the "BOOSTA" (single processor heatsink 80mm CPU fan): Noctua replacements are apparently the top choice because of their low noise levels and quality. So I've been told that the single processor cMP 5,1 uses a 80mm CPU-fan, and from what I've read all the cMP fans are 12V, 4-pin PWM types. Sonnet Allegro 4-port USB 3.1 gen 2 USB-C PCIe card ATI Radeon HD 5870 (1024 MB) graphic PCIe card 128 GB Samsung 830 SSD (2.5" SATA) MacOS/apps (MacOS 10.13 High Sierra) -will likely upgrade to a 1TB SSD (also 2.5" SATA) soon ![]() 12 TB/7200 RPM SATA HDD (Toshiba MG07ACA12TE) Time Machine backup 10 TB/7200 RPM SATA HDD (Seagate ST10000NM0016) main drive Single 3.46 GHz six-core CPU (upgraded from single quad-core 2.8 GHz) I'd say "light use" (email, web browsing etc.) for the time being, but as I've just installed Logic Pro X for making music that might increase (hard to say at the moment, but others reading might know more about that). OK, I understand that choosing a non-Apple replacement fan is a matter of determining the use of the computer (light, heavy or something in between) as replacement fans don't cool as efficiently. I have no problems disassembling, soldering or whatever just as long as I get hold of the information. I've read through most of this thread a couple of times, but among all the information and discussions and the specific fan models spread all over the place I find it hard to conclude on the specifics of what to buy and possible modifications etc. I've found out that most likely my cMP 5,1 (mid-2010) single-processor CPU fan (BOOSTA) is the one making a racket and needs replacing (apparently this fan is confirmed noisy by the OP as well). So far there doesn’t appear to be any issues sharing the exhaust fan header. When reinserting the CPU tray just ensure that the cable is either tucked along the bottom of the back plate or arched so that it doesn’t interfere with the tray. The length of the y split cable, the low noise adapter and the cable on the fan has enough slack to put the fan in position while the CPU board is out of the case. The other end of the cable is routed from the exhaust fan, behind the centre beam and loops back to the NB. I found that after removing the exhaust fan cable it was easier to plug in the split cable, then plug in the exhaust fan and tuck the cables behind the metal back plate. ![]() Due to the pin layout the NF-A4x20 only gets 12V and ground which isn’t too much of an issue as it will run at a constant rate. The exhaust fan uses the 4 pin socket while the NF-A4x20 uses the 3 pin socket. The left notch on the y split plug needs to be cut off with a knife in order to fit into the exhaust fan header. All of this can be done by simply removing the CPU tray. It also allows to store much of the cable slack behind the backplate. I decided on the rear header as the airport card doesn’t allow much room for cable management. I purchased an NF-A4x20 as well as the NA-SYC1 y split cable and plugged it into the rear exhaust fan header. I wanted to see if I could achieve the same result using the built in fan headers on the motherboard for a cleaner look. I registered an account here to report it! I saw your post re the NF-A4x20 for the NB and it inspired me to do the same. ![]()
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