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I'm sitting here looking at reviews saying that it's "false advertising" that one side of the split only has 3 pins rather than 4, and rubbing my temples. One yells "false advertising"... another says you can't control the speed unless you have two fans connected to the splitter. For a start, why would you only connect one fan to a Y splitter? Secondly, if you did, it *would* let you control the speed. Connect it to the 4-pin side, obviously.
The reason one side only has 3 pins is because you are controlling both fan speeds from one motherboard header and you cannot change them asymmetrically; they can only run at the same speed because they're being controlled from a single header. The pin that is missing from one side of the split is the one that carries the tachometric signal to report back from the fan to the fan controller/motherboard what speed the fan is currently running at... because you already know it's running at the same speed as the other fan, because they're controlled by the same PWM pin on the header, and that other fan will be reporting that speed from its tach pin.
Anyway, these are pretty much perfect unless you hate the wee Noctua sticker tag that's on them or something. It's a simple cable that does what it should, there's not much to complain about here.
I needed a Y splitter for my two NF-F12 fans that go on my NH-U12S Chromax (since it doesnt come with one!), and purchased these to resolve my problem.
These are really good quality cables - the majority of the cable is braided, running to rubber sheaths that protect the cable near the plug socket.
Yes, one of the plugs only has 3 pins, but this is because you cannot have both fans recording their RPM values in the bios when connected to the same header, only one fan can do this. Therefore, if you need to record the RPM of a certain fan, make sure you plug it into the plug with 4 pins. The 3 pin socket only drops the signal required for the motherboard to record the RPM of the fan, nothing else - both plugs are PWM and it is not 'false advertising' as one review suggested.
The only thing i was slightly concerned about was their size - they are pretty small, however this wasn't a problem for me personally. I guess Noctua decided to go small as they already sell fan extension cables, so you could purchase one of those if you need to. In my case, the small size was perfect and made it super easy to cable manage.
Overall, another high class Noctua product with great build quality.
Title and item description is misleading, it says it's a 4pin y splitter but as you can see in my picture one end is 4pin but the other is 3pin.... A few others have had this problem too, not sure if it's a faulty batch or not.... Having to return as i wanted a y splitter with TWO 4pins to plug my fans into
They work, before I had 3 fans now I have 5 fans. As a plus if your fans have short cables it helps by adding some extra length. Rember to check fan power use and mobo specks so you don't overload a header.
Off topic but seems that 2 fans in front one in back is optional, 2 extra in top and no real masive gains in temperature but hay used all my fans so I'm happy and can sleep them in BIOS
En las opiniones dadas está casi todo dicho, pero quisiera explicar el porqué de que una de las conexiones sea de tres pines y la otra de cuatro. El pin que "falta" en una de las conexiones, no es el que regula la velocidad, sino el que informa de ella a la placa base. Dado que ambos ventiladores van a una sola conexión, sería confuso que la placa recibiera información de dos velocidades potencialmente distintas. En la práctica, el PC recibirá información de uno de los ventiladores y regulará la velocidad de ambos.