Will this allow a pwm fan controller to manage the speed of a molex fan?

No, unless the fan controller is a standalone unit that is not connected to the fan headers on the motherboard, such as the NZXT Sentry 3. If you look closely at the item photo, you'll see that it only has 2 wires running to the fan, 12v hot & ground. Plugging in this adaptor will cause the fan to run at full speed, which will be loud as heck.

how long is the wire?

The cable is about 6-7 inches long.

Does this deliver the full 12v to the molex?

Assuming the 3pin sources is 12v, yes.

daisy chaining 5 4 pin molex fans, needing them to go to 3 pin male on motherboard, will this work?

It should but there could always be compatibility problems, Id just get one first and if it works then get more.

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⚡ Power your cool with sleek simplicity!

PLUG PLAY POWER - Effortlessly connect your 3-pin power source to any 4-pin Molex fan—no tech hassle.
TRUSTED DURABILITY - From Coolerguys, a reliable adapter that’s been powering setups since 2004.
SPACE SAVING DESIGN - Ultra-slim 0.2-inch thickness keeps your rig clutter-free and airflow optimized.
BROAD FAN COMPATIBILITY - Works flawlessly with most computer fans, ensuring your build stays cool and efficient.
BUDGET FRIENDLY UPGRADE - Premium performance without the premium price—smart investing for your system.

The OKGEAR 3-pin Power to 4-pin Molex Adapter is a compact, lightweight solution designed to convert 3-pin power sources to 4-pin Molex connectors, compatible with most computer fans. Measuring just 5.9 x 3.6 x 0.2 inches and weighing under half an ounce, it offers a space-saving, affordable upgrade option trusted by PC builders since 2004.

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Brand	OKGEAR
Item model number	4330584101
Item Weight	0.48 ounces
Product Dimensions	5.9 x 3.6 x 0.2 inches
Item Dimensions LxWxH	5.9 x 3.6 x 0.2 inches
Color	black
Manufacturer	Coolerguys
ASIN	B000H25PBK
Is Discontinued By Manufacturer	No
Date First Available	April 27, 2004

3pin Power to 4pin molex Adapter

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