3.14inch 4Pin

I bought this as a cheap fan to pair with my Noctua as my motherboard takes four-pin connector and with the exception of that Noctua all I have are 3-pin 80mm fans. The Noctua came with some adaptors, including a splitter and noise reducer. When I first fired this baby up when it was connected to the splitter with my Noctua, it was louder than a jet engine. I ended up hooking the noise reducer between it and the splitter and it quieted right down. Even with the noise reducer, it has great airflow. It was after I set it up that I went back to the product page to realize it's a server fan. Explained the noise and the fact it was cheap. It's actually a good fan, it was my fault for not paying attention about it being more for servers than normal desktop PCs. So yeah, five stars due it it's ability to keep my PC cool.

I put these in a server to replace some of the old 80mm fans. They're definitely loud, but that's what I expect from something this small, that moves this much air. Good price for the amount of air it's moving.

If you need a fan to blow lots of air and don't care about the noise, look no further. It works great. It's not the rush of air that is so annoying though, but the double ball bearings make a loud harmonic wine, even at low speed. It's a trade off and something you want to think about before deciding. I realized I couldn't live with the noise after a few minutes, but that's just me. Maybe you're deaf or maybe you're used to the sound of a jet engine in your living room, then you're golden. Maybe you want to put it into your wife's computer as a joke. But if you reside in hell, I think it's perfect. It will keep your CPU cool no matter how hot it gets down there.

I have a Dell 7060 MT I7-8700 (mid-tower) desktop I recently purchased and upgraded. One of those upgrades was to replace the original case fan with this fan. So a couple of things to consider. The original fan was 12V / .36A and rated at 40 CFM, and was whisper quiet. This fan is 12v / .45A and rated at 65CFM and is not whisper quiet, but is not in my subjective opinion very loud.In fact I like being able to hear it because I know it's working and have no false sense of security. I should add that I have been in IT for many years and am therefore innately suspicious of electronics in general. But I digress.So here's my end game - this fan generates way more air flow that the original. It spins at a much faster RPM and has almost 3 times the number of blades. Hence its relative noise to the original. I could barely feel the air from the old fan with my hand, but this fan's air flow is way more than the difference in the specs would indicate. My internal 512GB SSD (Win 10 Pro drive) dropped 5 degrees F and my 3T HHD (data drive) dropped 7. Well worth a little additional background noise because heat is a common killer of any type of drive.In addition to having the same DCV rating of 12 it's also important to use a replacement fan that has the same or lower current rating. A little higher difference is ok in *most* cases, again depending on a number of system variables. So to be absolutely safe use a fan with the same DCV and an amp (A) rating the same or less. In my case new fan's .45A was close enough to the old of .36A to not matter.Installation was easy as far as the new fan goes. Getting out the old fan was a pain in my case (no pun intended). However, I did have to trim off a piece of the new fan's 4-pin connector on its backside in order for it to fit into the socket on the motherboard. You may, or, may not, have to do that. Good luck!

I got these to replace my aging bronze bushed 80mm exhaust fans, my case uses 4 80mm fans for exhaust.These things move a ton of air, they seem well made.They are loud, i already knew this, i could care less about having a silent case.I ran them for a short time at 100%, was like an SR71 Blackbird spooling up for take off and stuff began blowing around the wall.They create a lot of air pressure.Presently running them at 30% until the case temps climb up

Fits perfect, great airflow, but this one fan is almost louder than any datacenter i've been in

The media could not be loaded. These 80mm fans are no joke. I got them because of the high static pressure, and they deliver.I am using them in a 3D printer as exhaust fans and needed something strong to push through the filters. I coupled them with a variable speed controller.The price is great and makes these a good value. They seem well built and the bearings are smooth. They do get fairly loud @ 100% but that is to be expected.

very powerful but loud. tried many fans this size nothing comes close for air flow, may be because width of this unit is thicker so blades lil bigger. great;