CPU Scythe Kaze Flex 120 Black vs Noctua A12x25 on Noctua L12 Air Cooler

Mark13

SFF Lingo Aficionado
Original poster
Sep 5, 2020
140
164
Just got the new Kaze Flex 120 Black 1500 RPM - mine spins up to 1646. Got it as a case fan for a new build but decided to compare it to a Noctua A12x25 as the upper fan on a L12 Ghost Edition dual downdraft with an A9x25 fan under the cooler on an Aorus B550 ITX MB with a 4750G APU build with 32GB Ram in a 5.9 liter Yiluka YLK-01 case with no space for other fans. I ran the Blender classroom render and Unigine Valley to stress the entire CPU/GPU of the processor. The temperatures in CPUID HWMonitor after completing the 10 minute render with Unigine Valley also running were identical on all 5 MB sensors, the pkg temp was 1 degree lower on the Kaze Flex, and both NVMe drives had identical temps. The render with the Kaze Flex took an additional 7 seconds to complete. This dual fan setup has counterrotating fans as in the Scythe Fuma II cooler. I then also tested the cooler with the Noctua A12x15 fan that performed slightly worse overall. Both fans had individual MB fan headers & were set to read the CPU temp & could rotate up to their max speed. Below are actual temps in a 21C room.

Noctua
A12x25​
Kaze Flex 120 Black​
Noctua
A12x15​
Temp Sensor 0​

42​

42​

45​
Temp Sensor 1​

43​

43​

45​
Temp Sensor 2 CPU​

68​

68​

72​
Temp Sensor 3 PCI​

21​

21​

21​
Temp Sensor 4​

42​

42​

45​
Temp Sensor 5​

43​

43​

46​
Pkg Temp​

69​

68​

72​
Wattage​

88.99​

88.96​

89.01​
NVMe Top​

45​

45​

48​
NVMe Bottom​

38​

38​

41​
Render Time​

/ 10:15.21​

/ 10:22.51​

/ 10:20.16​
 
Last edited:

msystems

Master of Cramming
Apr 28, 2017
550
952
So this is the 25mm Kaze right? Because they also make a 120×15 which looks pretty nice and I wonder how it compares to the A12×15