Yeah true, that's not a bad idea. If I wasn't as willing as I am to gain more knowledge about what's possible with upgrading these systems with proprietary motherboards then I would've just bought an all Noctua set-up, thus letting me avoid some of these compatibility concerns entirely. Although, the equivalent Noctua CPU/fan combo would've costed another $80 AUD, so I'm glad I have tried the V5, even if it has some drawbacks like fan speed on the stock fan. Anyway, in case anyone is interested: I decided to just go for it, and it turns out the Vetroo V5's fan does work with the Noctua FC-1 fan controller. I now have the fan controller connected to the V5's fan, as well as to the rear Noctua fan (connecting them both to the CPU fan header through the FC-1). With the controller set to no-stop mode, but on minimum speed, there's now no audible fan acceleration from any fans until the 11700's CPU temp (as measured by MSI afterburner) hits approximately 70°C. Could be earlier, maybe the fan starts to accelerate in the high 60's and I'm not hearing it, unlike before when the CPU fan would start to rapidly accelerate at 55C. On that note, it's a much gentler increase in volume now. This means that I no longer have to try to find a specific low enough MHz limit that won't make my system rapidly become intolerably loud as soon as I enter a section of a game that's moderately more CPU intensive than normal. I can now let the temperature hit that point where the 80mm Noctua front fan (the one that isn't connected to a fan controller) starts noticeably accelerating, then I can wait to see if it settles down, or stays quiet enough where I can accept that increase. TL;DR - The Noctua FC-1 fan controller does work with the Vetroo V5 CPU fan. I'm now using it on no-stop mode @ minimum speed to keep the fan noise as low as possible without the fans connected to it turning off. In a game where the fan noise would rapidly accelerate to excessive levels if the CPU was at 3500 MHz, I can now increase that maximum MHz limit to 4000 –maybe even higher– without any disruptive increase in fan noise. Highly recommend.
Hi, first of all I'd like to thank other forum users, whose tinkering I've benefitted from immensely. Thank you for sharing your experience so others can benefit from it, it really helps to know what does and doesn't work. However, there are some questions I can't find answers to, unfortunately. That being said, I'd like to ask; has anybody tried using the Noctua FC-1 fan controller with the Vetroo V5 CPU fan? Please let me know about your experience. I mean specifically using it to keep the fan speed down, though just knowing you can control the CPU fan speed with the FC-1 (or other fan controllers) would be great news for me. (Italics used to denote information not directly related to the question. Just want to minimize time wasted for the reader as best as I can). If you're curious as to why I want to keep the CPU fan speed down: The Vetroo V5 fan is LOUD. The cooler is great value, but unfortunately the big new CPU fan becomes unacceptably loud to me at 55°C. With the stock pancake cooler + 80mm fan combo the fan only usually became intolerable at around 75C. I don't know why that is. My guess is that the voltage supplied by the motherboard to whatever fan is connected to the CPU fan header is tethered to temperature? And, since the motherboard doesn't "know" I've replaced the stock 80mm fan with a massive 120mm 1700 rpm fan, it tells the fan to run at, say, 1500 rpm, which is much louder on the new fan? My only other guess is that perhaps the new fan is distributing hot air in the direction of one or more of the CPU temperature sensors, and the motherboard is responding to that. Perhaps a combination of the two. Maybe someone can point me in the right direction here. Regardless, I'm willing to run the CPU hotter than the 55C the fan now rapidly spins up at, since I don't want my 4900MHz turbo CPU to be unusably loud for gaming at just 3500MHz. Apparently Intel says even 99C is safe. Don't know if that's true, but I know it makes me feel comfortable with the prospect of exceeding 70C or so if that allows me to get my money's worth. I've been surprised by how little fps I lose by limiting MHz in power options (used powershell commands to enable setting processor MHz limits), but I want to be able to get what I was led to believe I was paying for when I was more naïve. For anyone reading just out of curiosity, the XPS 8940's motherboard doesn't permit software control of CPU fan speed (I believe only Alienware models allow user-control of the CPU fans through software), hence I've resorted to install extra fans and using fan controllers to circumvent that restriction. So, the ideal situation for me here would be to be able to use the FC-1 with the V5 CPU fan. Otherwise, I would also be relieved to hear that others have successfully controlled other CPU fans on the XPS 8940 (or other XPS models, I suppose) using the FC-1 or a different fan controller. Why I believe the FC-1 should work with the V5's fan: - it works with my other 12V 4-pin fans. - Noctua's description of the FC-1 says it's compatible with "all Noctua 12V PWM and 5V PWM fans, many third party PWM fans." I think it seems obvious it should work, since I'm already using the FC-1 to control other 4-pin 12V fans in my system. But, they're connected to the case fan header, and I'm not as savvy with this stuff as many of you, and so I'm worried that the CPU fan header is a little more discerning in some way. So, I'm thinking of trying: - V5 CPU fan and Noctua 80mm PWM fan --> CPU fan header. And Noctua 92mm fan --> rear case fan header. Should that work? I suppose I'm willing to sacrifice the new 80mm front fan, if I have to in order to calm the V5 CPU fan. I'm 99% sure that even if it doesn't work, the result would just be something like the system starting with a BIOS error and then shutting itself off, or something like that. However, I'm simply not willing to take that risk yet. I'm sure most of you can understand that even if it is silly.
XPS 8940, Noctua FC-1 fan controller, stop Vetroo V5 CPU from rapidly spinning 
up?