I have fans that run at 1600 rpm, how much reduction in rpm will these reducers give me?

Its approximately a 30% reduction in my experience. Keep in mind they don't work for 5v fans or fans that use more than 2.5 watts.

Questions & Answers: Noctua NA-SRC10, 3 Pin Low-Noise Adaptor Cables for PC fans (Black)

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Noctua NA-SRC10, 3 Pin Low-Noise Adaptor Cables for PC fans (Black)

Low-Noise Adaptors for reducing the running speed and noise emission of PC fans
3-pin connectors for 3-pin fans
Black connectors and black cable sleeving for clean optics
Compatible with all 3-pin Noctua 12V fans except industrialPPC series, ideal for redux line fans
Set includes 3 cables; Trusted Noctua quality backed up with 6-year manufacturers warranty

$15^.24 –