Reddit mentions of Evercool Model EC-DF001 17.72" PWM Braided Fan Splitter Run Multiple 4 pin fans!

This is the cable I picked up. Some claim it will control all based off the 1 4-pin connector. Others say it doesn't. I'm like you and I just want all my fan speeds controlled by my single header. This cable should allow the PSU to power the fans, and the header to control speed.

Fan splitters. There are many different ones available.

Motherboard with only 1 case fan connection if there are multiple fans in the case how can I get variable speeds on all of them using the one connection? I found this but that only passes the speed control to 1 fan as opposed to all of them.

For more fan headers, I tend to get these.

https://www.amazon.com/gp/product/B009D3KQ54/

Reasonably priced, but very useful.

Interesting items here -

https://www.amazon.com/ModTek-4-Pin-Molex-Connector-Connection/dp/B00MYA3A4C#Ask
https://www.newegg.com/Product/Product.aspx?Item=N82E16812198025
http://www.outletpc.com/jz1592-lightblue-molex-to-3x3-pin-cable-bb.html?gclid=CKL8hpH5rdICFQmBswodlhYCdQ
http://www.koolertek.com/computer-parts/pc/Adapters-Extensions-c169.htm
http://www.kingwin.com/cooling/fan-controllers/
https://www.amazon.com/Cable-Matters-Molex-Power-Adapter/dp/B00STNUB04/ref=sr_1_3?s=pc&ie=UTF8&qid=1488121475&sr=1-3&keywords=SATA+Power+Adapter+Cable
https://www.amazon.com/BitFenix-Alchemy-Multisleeve-Triple-Adapter/dp/B00HVBOSCW/ref=sr_1_2?s=pc&ie=UTF8&qid=1488122582&sr=1-2&keywords=BitFenix+Alchemy+Multisleeved+20cm+4Pin+Molex+Male+to+3x+3Pin+Fan+Male+12V+Adapter+Cable
https://www.amazon.com/Computer-Splitter-Connector-Sleeved-Adapter/dp/B00DYQRFY6
http://www.evercool.com.tw/categories/global/cables/fancablesadapters/ec-df001/ec_df001.php
https://www.amazon.com/Evercool-EC-DF001-Braided-Splitter-Multiple/dp/B009D3KQ54/ref=sr_1_4?m=A18K25N425Y52T&s=merchant-items&ie=UTF8&qid=1488123956&sr=1-4
http://www.microcenter.com/product/221360/TX3_Fan_Power_Splitter_Cable
https://www.coolerguys.com/products/evercool-fan-cable-5-pwm-fans-cb-ec-df001
http://www.evercool.com.tw/categories/global/cables/fan_cables_adapters.php
https://www.amazon.com/JBtek-Black-Sleeved-Splitter-Computer/dp/B01GZPEQW6/ref=pd_sim_147_6?_encoding=UTF8&psc=1&refRID=W321Y22MPQZY3QRKQX5C#Ask
https://www.newegg.com/Product/Product.aspx?Item=N82E16812162026
http://www.frozencpu.com/products/8770/ele-419/FrozenCPU_Deluxe_Multi_Power_Port_-_12V_7V_5V_OF12.html?tl=g12c34s275#blank
http://www.frozencpu.com/cat/l3/g/c121/s424/list/p1/b33/Swiftech-Fan_Accessories-Multi_Fan_Ports-Page1.html
https://www.newegg.com/Product/Product.aspx?Item=9SIACJF5497353&cm_re=4_pin_to_3_pin_fan_adapter-_-9SIACJF5497353-_-Product
http://www.deepcool.com/product/dcoolingaccessory/accessory/index.shtml
https://www.newegg.com/Internal-Power-Cables/SubCategory/ID-2820

Is this what you were describing?