At the time of writing this article, to my knowledge there are no other thin 15mm aRGB fans on the market. At least on Revain, maybe a lesser known Chinese company has it on aliexpress but I'm not sure. So if you want a thin fan and also want RGB, that's pretty much the only option. They're a great option too! They work perfectly and are within the expected noise level. They CLAIM to have the same static pressure as Noctua's thin fans, but take those numbers with a grain of salt as companies often use different testing methods. They were just great for me and what I needed them for. They are in a special water circuit of Lian Li PC-o11D where I have limited space between the heatsink and the vertical GPU mount. In the picture above, these are the fans on the underside of the case.
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