CRJ 12V Step-Up USB to Dual PC Fans Power Adapter Cable - 24-inch (60cm), Black Sleeved - Full Fan Speed Adapter for 3-Pin/4-Pin Cooling Fans

I have more than my fair share of PC fans and in a flavor of sizes (mostly 120mm and 140mm). I actually use them to keep network equipment cool at my parents house (one is pointed to an Arris SB8200 modem, another for the Asus AC68U).The modem tends to have connectivity issues with lots of uncorrectables when left running as is. After putting a fan on it, blowing directly onto the heatsink, the number of uncorrectables dropped significantly. Since there's no way to easily attach a fan to the modem, I used this adapter and an old USB charger to power up two Cooler Master fans. Even at max RPM (about 1100RPM), the fans are completely silent and keep my parents network problem free.This adapter will force any 2/3/4 pin fan to operate at full speed, so be mindful if this will be in a sound sensitive environment.

Worked great for a small Halloween project I had, quick shipping made it perfect.

Working great with two old stock fractal designs fans.

Works as advertised, however, the housing does get a little hot and it started to fall off a little. But other than that, no complaints.

I have a little mini 'industrial pc' that I use as a router, and well it's fanless. No place to fit a reasonably sized fan inside the little case. So I used this, connected to an AC USB charger I had, to connect two fans on the outside of that little PC. One on top blowing on the cooling fins, and one on the bottom blowing into the vent holes, using velcro to attach them. No jerryrigging them to some (I think) fan connectors on the inside of the case and hoping it would work. This simple little device just made it easy to hook them up.

I had an extremely niche and frankly silly problem that I had with some extra desktop fans I had sitting around. Did some research and these ended up being my pick. Did not disappoint!

Used this with a slim travel laptop to keep it from thermo-throttling during rendering.Slim travel laptops aren't designed to run at full speed for very long. This leads to throtteling where a top end cpu (i7, etc) can actually result in worse performance than the budget option (i3) in the same case when redering. I packed this along with two of the lightest 120mm fans that I could find in my box of fans. I brought nothing else. On location I proped up the laptop using whatever was at hand and was presently suprised thay this actually worked in cooling the X1 Carbon enough to keep it from throttling. Of doing the same, I recommended looking for slim profile fans.

I used it with two 240mm fans I had, in order to make window ventilation for my room. Don't ask where I got the fans; I have had them for a very long time and do not remember.