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Congrats on your build! I'm waiting on my K39 V2 case being delivered so always keen to see similar builds. My 7660b arrived a couple days ago. I'm not taking the panel off it just now as need to steam a void warranty sticker off but I done a wee googly and peeked through the vent to confirm (as best as I can tell) that the fan you're looking for is an ADDA AD0412XB-C51 as seen here.
