SCYTHEKaze Flex II 120 PWN, 120mm x 25mm Air Flow Optimized Quiet Operating Computer Case Fan, Fluid Dynamic Bearing, 4-Pin Connector, Single Pack (White Edition - 2000 RPM)

Used this to replace a CPU cooler fan, it's been working great! Quiet under load but when it's at full RPM it is loud of course, but pushes good airflow; you can control the fan curve though with most BIOS settings. Has no issue cooling a Ryzen 5. Rubber anti-vibration pads on all corners is great too.

I had the Scythe Myugen air cooler on my PC up until upgrading to a beefy 5800x3d. Upgraded my cooling to a corsair 360mm AOIC and the factory fans were loud. Like 2013 Walmart standing fan loud. Swapped out the fans with these guys and its near silent now with much lower temps.

Providing objective data for testing fans is challenging without expensive equipment, so I'll mainly be comparing it to other 120mm fans I have experience with - namely Arctic's F12 PWM, Noctua's NF-A12 FLX, and Nidec's Gentle Typhoon PWM (2150rpm).At 100% speed, this fan moves a lot of air - more than any of the others except the Nidec. The Nidec is substantially louder though, and I think it might still be louder even if I slowed it down to the same speed. The Kaze is definitely noticeable at 100% and I wouldn't want to hang out in the room with it at that speed, but it's not *loud* - you don't need to raise your voice to talk over it - and it's not whiny or otherwise annoying. Mine hits around 1550RPM at full, which matches specs. At 70% and ~1130rpm, it is nearly silent and still moves more air than the Arctic or Noctua fans (though the Noctua is a static pressure fan, so it's not intended to compete in open air). I would probably only run this as low as 30%, just because it really is pretty much silent at that speed (570rpm for me) and going lower will strongly impact the amount of air moved.As far as the physical construction of the fan, it feels tightly assembled as you'd expect for anything that has to spin at 1500rpm without falling apart. Corners are pre-equipped with rubber vibration-dampening pads - an extra which I haven't commonly seen from anyone else but Noctua - and rubber mounting pegs are provided as an alternative to the classic fan screws. The cable is fairly short but given the included extension, that's a bonus to cable management options. I can't really think of anything to ding this fan on - the only thing that would stop me from putting them everywhere is the premium price point. Fortunately, I still have cheap fans for all the things that don't really need to be very cool.

The Scythe Kaze Flex II 120mm PWM fan box includes the fan, screws and pins for attachment, and an extension 4-pin cable. It's listed as a "Premium Quiet PC Computer Case Fan". And for the most part, it is. At lower RPMs it's barely audible. When ramped up to higher RPMs it's certainly audible but not overly loud. There are quieter fans on the market but this one is pretty good. I like the new frame design and I always love rubber/silicon vibration dampeners in the corners, which this one has. The fan pushes a good volume of air and does its job well. I've had experience with Kaze Flex slim fans previously and they were very good. It's no surprise that this fan performs well also. 5/5 stars.

I don't understand other reviewers complaining about the price of this fan. It's much cheaper than offerings from Corsair or other major brands (of which Scythe is definitely one). It doesn't have flashy RGB, but it supports PWM, has rubber vibration isolators, and the specs are fine (I and other reviewers here lack the instruments to confirm those specs so be wary of claims regarding that).

I've been a big fan of Scythe's products over the years, and figured the Kaze Flex II would be a pretty simple upgrade over the original Kaze Flex with a slightly higher RPM range. It, unfortunately, is not. Compared at the same RPMs, the Kaze Flex II is MUCH louder than the original, and it produces an incredibly annoying high pitched noise, almost like some type of whine. Even if the airflow is a bit better, the noise difference is a deal breaker.The Kaze Flex 120/140/RGB and the Wonder Snail fans are great, I have no idea what went wrong here.

Summary: Overall a decent fan. The build quality feels good, not a lot of flex. Good at moving air without making too much noise.The cable is what you'd expect. It has plenty of length to route out of sight while still being able to reach the header on your motherboard. Despite the cable being black it's also sheathed in that mesh flex stuff. I liked the included extension cable, though the JST connector is a little bulky and could make cable routing complicated if you needed to use.The included quick-mount rubber stems were handy for quickly setting this fan up and trying it out. No need to screw the fan in, and hopefully the noise is reduced.This fan is pretty quiet. It makes a tad bit less noise than my other 120mm case fans. Personally I don't know if minimizing case fan noise is worth the extra money. Once the case is all closed up I don't hear that much of a difference.This is definitely an airflow-focused fan. I can tell a difference when replacing Lian Li ST120s with this fan for a 240mm radiator; the static pressure focus of the ST120s is better suited for that application. This fan's place is as an intake on a more open part of the case, or as an exhaust. It moves a good amount of air, and I don't think you'd be maxing the fan out to keep your machine running fine even when gaming.At the time of writing this review, the price of this fan was $15.95. That's pretty pricey for what you're getting. The competition here is stiff. The ST120 I compared this fan against came from a 3-pack that had the fans (with ARGB) and a fan hub for $40. I know the two fans have different goals, but I think the price of this fan will need to come down to be a consideration for PC builders.