Box, Contents & Bundle
Arctic sent me the 3-fan package. Since this is a server-oriented product, don’t expect a fancy box. It’s just plain cardboard with a sticker showing the fan model and the basic specs.
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The fan has five large blades to produce more airflow and static pressure. The larger the fan’s blades, the more air they push. Their angle of attack also plays a role in this.
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There are no rubber pads on the fan’s corners since vibrations will be increased at full speed whether these pads are present or not. The fan’s width is also increased to accommodate the large motor, and the fan’s blades can also be larger.
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The fan uses a dual-ball bearing, which is the standard in server and industrial applications since this type of bearing can withstand high operating temperatures.
Is that secondary impeller noticeably adding harmonics, particularly that major 3rd? I’m actually curious if this thing has sound design characteristics I might want to experiment with.
please check the frequency analysis I conducted for that.
Hi @crmaris can you please tell me what size screws I would need to mount this fan on an AIO radiator?
It is 38mm thick so 45mm long I would say.
Besides the thickness, is there any reason the home enthusiast should not consider these the best watercooling radiator fans for low noise? Less optimal noise frequencies than its competitors?
The thickness is the major issue for most cases, with limited internal space.
That mechanical clicking in the low speed recording sounds like it could get *pretty* irritating.
As someone who tried using these (8K variant) fans for home PC cooling, I can confirm that clicking noise is VERY irritating already at ~1K RPM. I bought pack of 3, and each of them sounded like this – mounted, not mounted, held by hand, etc. Clicking becomes tolerable around 400-500 RPM, but listening closely they’re still pretty noisy compared to others, and at this point there’s no advantage in using these fans over anything that came pre-installed with case. Too bad, because overall they’re really cool and with such static pressure would be perfect for a crowded PC.