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 rig like a pro—compact, reliable, and ready to roll!

SPACE SMART DESIGN - Compact adapter keeps your rig clean and clutter-free, maximizing airflow and aesthetics.
BUDGET FRIENDLY UPGRADE - Affordable solution to power your fans without breaking the bank.
PLUG PLAY POWER BOOST - Effortlessly connect your 3-pin power source to 4-pin Molex devices without hassle.
RELIABLE 12 V POWER DELIVERY - Ensures stable and efficient power transfer for optimal fan performance.
UNIVERSAL FAN COMPATIBILITY - Works flawlessly with a wide range of computer fans to fit your custom setup.

The OKGEAR 3-pin power to 4-pin Molex adapter enables seamless connection of 4-pin Molex-powered fans to 3-pin power sources. Its compact design saves space inside your PC case while supporting a wide range of fans. This affordable adapter delivers stable 12V power, making it an essential upgrade for efficient and tidy system builds.

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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

OKGEAR 3pin power to 4pin molex adapter

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