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EFZ-92HA3 review
The 92mm fan on the SilenX EFZ-92HA3 heatsink rotates at up to 2200RPM which creates just 41.6 dBA noise. At its reduced fan speed of 800RPM, the EFZ-92HA3 heatsink hums along at 33.0dBA noise, which is a pretty quiet. At full fan speed the EFZ-92HA3 heatsink maintained a CPU die temperature of 17.1°C at stock fan speed and 29.0°C at reduced fan speed. Where the EFZ-92HA3 heatsink falls into its own is on sub-85W TDP processors where CPU heat output is much better matched to its diminutive size and 92mm cooling fan.
EFZ-92HA3 detailsfrostytech review 
EFX-12-12 review
Many system builders--whether professional, enthusiast, or regular consumers--are on the look out for products that can do the job well without breaking the bank. The SilenX EFX-12-12 is just such a product. It is well constructed, very quiet, and inexpensive. As can be seen from the test results it performs better than one would expect given it's RPM and CFM ratings. If looking for a silent replacement for a CPU cooler fan, or an aftermarket fan to improve airflow in a case this fan is definitely worth consideration. The included mounting hardware gives consumers a choice between screws and anti-vibration mounts, while the power connectors allow installation into any existing setup.
EFX-12-12 detailsbjorn3d review