The standard price is $15 for this 3-pack of fan splitter cables from the usual Australian retailers but you can get it for the bargain price of $5 including delivery as an eBay Plus member using today's PLUSFDET code.
Product Summary:
The NA-SYC1 is a fan accessory set consisting of three fully sleeved NA-YC1 Y-Cables for 4-pin PWM fans. The NA-YC1 Y-Cables make it possible to run two 4-pin PWM fans on a single fan header and to let the mainboard control the speed of both fans simultaneously. Multiple NA-YC1 can be daisy-chained to control more than two PWM fans via one header.
These cables are handy when needing to power several fans in a larger computer system where fan headers are limited or for more A E S T H E T I C cable management. It is recommended that you do not chain-link multiple Y-Cables to each other if you can avoid it and instead use them to control two fans only. It can be done as mentioned in the blurb but there have been reports of hit and miss RPM accuracy depending on the motherboard.
Do I need them?
Probably not, unless your running lots of fans in your huge e-peen computer gaming rig.
Are they a bargain price for 4 Pin PWM Fan Power Splitters?
Yes, yes they are.
So do I need them?
Yes, definately.
Thanks, bought one.