Reddit mentions of ModTek 4-Pin Molex to 4 x 3-Pin Fan Connector Cable (Power 4 Fans from 1 Molex Connection!) (ModTek 4-Pin Molex to 4 x 3-Pin Fan Connector Cabl)

Yeah, it looks like you're good. If the other fan is a regular 3pin you can get an adapter like this to connect it to the power supply.

After getting the correct parts with a lot of research on which parts to get, Linux(Ubuntu) is running Eight GPU XMR Rig. I added the list so that you do not have to wonder which parts to get.

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Eight GPU Rig Essential Shopping List:

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NOTE: I do not get paid for referring to newegg.com, ebay.com and amazon.com.

You can search them using google and duckduckgo.

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1. COLORFUL C.B250A-BTC PLUS Motherboard LGA1151 Mining 8 Graphics Card Stolts US
   
   https://www.ebay.com/itm/COLORFUL-C-B250A-BTC-PLUS-Motherboard-LGA1151-Mining-8-Graphics-Card-Stolts-US/123046058473?_trksid=p2485497.m4902.l9144
   
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2. Six PowerColor Red Dragon Vega 56 GPUs and two MSI Radeon RX Vega 56 Air Boost 8G OC.
   
   Linux and xmrig-amd miner do not work well with PowerColor Red Devil Vega 56 GPUs.
   
   https://www.newegg.com/Product/ProductList.aspx?Submit=ENE&IsNodeId=1&N=100007709%20601302833
   
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3. CPU - Intel Celeron G3920 Skylake Dual-Core 2.9 GHz LGA 1151 65W
   
   https://www.newegg.com/Product/Product.aspx?Item=N82E16819117619
   
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4. G.SKILL Ripjaws Series 16GB 260-Pin DDR4 SO-DIMM DDR4 2400 (PC4 19200) Laptop Memory
   
   It may work with 8 and 4 GB modules. I had 16 GB on hand and I did not want to buy extra.
   
   https://www.newegg.com/Product/Product.aspx?Item=N82E16820232155
   
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   5. Seasonic PRIME 1300W 80+ Platinum Power Supply
   
   https://www.newegg.com/Product/Product.aspx?Item=N82E16817151214
   
   More power needed for overclocking.
   
   
5. EVGA SuperNOVA 1600
   
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6. Electop 2 Pack 2 Pin SW PC Power Cable on/Off Push Button ATX Computer Switch
   
   https://www.amazon.com/Electop-Power-Button-Computer-Switch/dp/B01LMZZFWO/ref=sr_1_1?s=electronics&ie=UTF8&qid=1537039724&sr=1-1&keywords=SW+PC+Power+Cable+on%2FOff+Push+Button+ATX+Computer+Switch+Wire
   
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7. 4 X 120mm DC 12V 2.4A 200CFM 3Wire 3Pin TAC Connector FFC1212DE CPU Cooling Fan
   
   https://www.amazon.com/gp/product/B07538SG1H/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
   
   NOTE: The fan is very noisy since it is comparable to server grade fan.
   
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8. ModTek 4-Pin Molex to 4 x 3-Pin Fan Connector Cable (Power 4 Fans from 1 Molex Connection!)
   
   https://www.amazon.com/gp/product/B00MYA3A4C/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
   
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9. Eight COMeap 6 Pin Male to Dual 2X 8 Pin (6+2) Male PCI Express Power Adapter Cable for
   
   Graphics Video Card 24-inch (62cm)
   
   https://www.amazon.com/gp/product/B076YXS6KL/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
   
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   ​
   
   How to get it working quick guide.
   
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   Connect PCIE cable provided by Seasonic(You will use 4 cables providing 8x6 connections) to
   
   PCIE input ports.
   
   Since the mother board does not have 24 pin connector, you have to short 24 pin connector
   
   as shown in the following Seasonic self test video using the paper clip.
   
   If the 24 pin connector notch is on top, connect 4th pin on the first row with 3rd pin on the
   
   second row.
   
   https://www.youtube.com/watch?v=4CNsQPFxJdM
   
   Cover the paper clip with electrical tape.
   
   ​
   
   Once you get the pc booting, install according to my Vega mining guide with onboard GPU and single Vega and stop it at "ADD ALL THE VIDEO CARDS HERE". Turn off the computer.
   
   Connect remaining seven COMeap 6 pin connectors to PCIE output ports on the mother board and to other 7 GPUs.
   
   ​
   
   Vega Mining Guide for Linux(Ubuntu)
   
   https://github.com/xmrminer01102018/VegaToolsNConfigs
   
   ​
   
   ​
   
   Quick sequence for running the miner.
   
   NOTE: Replace gpu sequence, *data* file and fan speed according to your equipment.
   
   Copy config.json_V56_8GPU to config.json and add your wallet id to it.
   
   If you are using V64 and FE, change intensity to 960 and use the different *data* and PPT files.
   
   ​
   
   ./setSMClockVoltages.sh 1,2,3,4,5,6,7,8 MSIV56H.data_OC8_7 skip
   
   ./setGPUOC.sh 1,2,3,4,5,6,7,8 7 6
   
   ./setPPT.sh 1 V56PPT
   
   ./setPPT.sh 2 V56PPT
   
   ./setPPT.sh 3 V56PPT
   
   ./setPPT.sh 4 V56PPT
   
   ./setPPT.sh 5 V56PPT
   
   ./setPPT.sh 6 V56PPT
   
   ./setPPT.sh 7 V56PPT
   
   ./setPPT.sh 8 V56PPT
   
   ./setAMDGPUFanSpeed.sh -g 1,2,3,4,5,6,7,8 -s 82
   
   cd ~/git/xmrig-amd/build
   
   ./xmrig-amd
   
   ​
   
   ​

1. Yes, it's perfectly normal. What you would want is an adapter like this. You can connect all three fans to a single molex from the PSU.
   
2. The downside to this method is that the fans run at full speed all the time, which may or may not be too loud for your taste.
   
3. Yes, use a 3 pin splitter which will allow you to connect 2 fans to one mobo header, that way you can connect all 3 fans to the mobo and control their speed.
   
4. No reason to do this

Something like this will power all of your fans if you don't mind them all running at full speed all the time.

If you want to control the fan speeds individually you'll want a fan controller.

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

Some PSUs come with 3 pin headers so you might want to check if yours has those. You can also get a molex to 3 pin header like this one:https://www.amazon.com/ModTek-4-Pin-Molex-Connector-Connection/dp/B00MYA3A4C/ref=sr_1_2?ie=UTF8&qid=1498618080&sr=8-2&keywords=molex+to+3+pin or fan header splitters like this: https://www.amazon.com/JBtek-Black-Sleeved-Splitter-Converter/dp/B01EF9OI0O/ref=sr_1_1?ie=UTF8&qid=1498618057&sr=8-1&keywords=fan+header+splitter

Here you are:

https://www.amazon.com/Coolerguys-100-240v-Molex-Power-Adapter/dp/B000MGG6SC/

You might need another adaptor to connect that to your fan. Something like this:

https://www.amazon.com/ModTek-4-Pin-Molex-Connector-Connection/dp/B00MYA3A4C/

It sounds like your cooling device and/or fan is straight-up malfunctioning. If the fan itself is shown to be working ok, it could mean something else is messed up like the port or the signal to the fan. If it's the port, you may have a different 3 or 4 pin fan port to connect to on your motherboard -- take a look and see if you can find another port to use and see if it helps.

Otherwise, it may be possible to find a molex-to-fan adapter or sata-to-fan adapter and ensure that the fan is getting full voltage, all the time. You can always tweak it later via software and/or BIOS. Further, this may be a direct issue of the BIOS, e.g., having a setting that either ramps speed of the fan with heat of the CPU or is just plain borked. Check for a BIOS update if possible and apply it if you can get it running.

I would concur that buying a high quality CPU cooler is critical for any build, and a standard CPU cooler is grossly inadequate. Maybe consider shelling out a pretty penny and get a mighty cooler that is guaranteed to deliver massive heat removal.

Good luck!

You can always just convert molex to standard 4pin PWM

Link: ModTek 4-Pin Molex to 4 x 3-Pin Fan Connector Cable https://www.amazon.com/dp/B00MYA3A4C/ref=cm_sw_r_cp_api_2Cylzb1P7QNKG