Reddit mentions of Cable Matters 2-Pack 2 Way 4 Pin PWM Fan Splitter Cable - 4 Inches

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So a member of the Stress Level Zero team shared a now-pretty-popular image of his frunk fan mod using 40 mm computer fans to ventilate the Headset. I was inspired, so I went on a hunt for the quietest efficient fans I could fine, and that search led me to Noctua's 5V 40mm computer fans. They're listed at only 19.6 dBA (I'd say they're quieter than that - more like having a ceiling fan on in the room), and yet the can still move plenty of air at 5,000 rpm.
The original mod had the fans blowing cool, external air into the headset. I originally tried this and it left me very disappointed as I couldn't sense any air moving. The only time I did feel air moving was when I angled the fans to blow upward into the vents in the upper portion of the frunk, and it was hot air (which would be a disservice to the wearer, obviously). The only pro was that it cooled off the components.
So I simply flipped the fans over and it made a world of difference. There's a slight gap between the HMD and the face gasket at the nose (which does cause light bleed but with the lights off, who cares?), and with the fans sucking hot air out of the headset, a draft is created between the wearer and the inside of the headset, bringing in cool air around the nose and ventilating the inside of the headset. It also does a stellar job of keeping the components cool I've found. I spent about 4 hours in it at one time and not once did I get warm inside of it.

What I used:
Black Duct Tape
2x 40mm 5V Noctua Fans at 19.6 dBA (they're 4-pin but they include 4-pin F to USB M adapters with each fan)
4-pin Splitter Cable to join the two fans

What I would probably use instead:
A better mounting system than duct tape, for one
The same fans
This all in one 2 3/4-pin to USB splitter/adapter
This USB toggle switch to turn off the fans

you can use the rest.. and you can use a splitter to say join pairs / tripples of fans onto one header..

Like this https://www.amazon.com/gp/product/B008YD7B0M

Which I got an like.. they make less fancy ones and also splitter cables https://www.amazon.com/Cable-Matters-2-Pack-2-Fan-Splitter/dp/B01DV1Z0Z4

That you can use to just have 2 fans into one header..

CPU-Opt AIO and ext fan headers are just extra fan headers.. the AIO ones usually can handle more AMP's (like from a water pump) and hence you could hook more fans up to that header.. yo just need to make sure you do not go above the rated amps for a give fan header.. like tying to put (6) .5 amp fans on a 1amp fan header.. most fans are more in the range of .15 amps or less so you can put at least 2 and as many as 4 per header..

Get one of these and keep your push pull setup ... Cable Matters 2-Pack 2 Way 4 Pin PWM Fan Splitter Cable - 4 Inches https://www.amazon.com/dp/B01DV1Z0Z4/ref=cm_sw_r_cp_apa_i_nxf0DbPN37MQP

The easiest way is using PWM fan splitters like these

You have to look for something like this but you should check if you need 4pin or 3pin adapter cable.

I used these https://smile.amazon.com/gp/product/B01DV1Z0Z4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I recently bought this computer (an HP-ENVY 750-411 for $550 incl. tax/shipping and featuring an rx 480, not too bad), which comes with this motherboard (a uATX Odense2-S). The only case fan it has is a 90mm rear exhaust, which I upgraded to a better 90mm, but wanted a bit more active airflow, so I installed one of these on the side. Unfortunately, the mobo didn't come with any extra fan headers, so I used one of these splitters to split the existent 3-pin case fan header on the mobo into two 4-pins to accommodate both the 3-pin 90mm fan and the 4-pin 120mm fan linked above.

Turning the computer on, everything seems to be running (for 48h + now), but the white led of the additional 120mm fan seems to cycle from dim <-> bright with a cycle time of around ~1.5s (never turning off or sharply flickering, though). I have this fan on another computer with a dedicated, unsplit 4-pin connection, and there it's a consistent bright white light. Is this any cause for concern here? Is there not enough power going to both fans? Am I at risk of blowing the mobo out or something? I have some extra, unused cables running from the psu so I might try to find an adapter to power the extra 120mm fan.

Thanks!

Just bought this case for my wife's new PC and am having the same issue. I purchased this 4 pin to 3 pin converter and it didn't fit right, so I'm thinking I must have gotten the wrong item. If anyone has figured this out please help :)

You could just get a fan cable splitter. That way they run at the speed the motherboard sets.

https://www.amazon.com/gp/aw/d/B01DV1Z0Z4/

Yes

According to the specs your MSI motherboard has 1x 4-pin CPU fan connector and 2x 4-pin system fan connectors.

source: https://www.msi.com/Motherboard/B450M-GAMING-PLUS/Specification

If it's not enough, you can buy splitters: https://www.amazon.com/dp/B01DV1Z0Z4/
or a fan hub: https://www.amazon.com/dp/B01G9BEC5W/

Okay, my silly self thought a 3 pin female to 4 pin male splitter was the only thing that existed. I think I can cancel my original order as I ordered that other fan splitter just yesterday.

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I found this other fan splitter on Amazon and I'm sure this is the right one this time. I'll get this one instead:

https://www.amazon.com/Cable-Matters-2-Pack-2-Fan-Splitter/dp/B01DV1Z0Z4/ref=sr_1_1?keywords=Compatible+with+4+pin+Case+Fan+and+4+pinsplitter&qid=1558866698&s=gateway&sr=8-1#customerReviews

Core V1 is pretty easy since you can remove all of the sides to get at everything.

About the only tricky part is mounting the CPU cooler. Make sure the backplate is on correctly, and when attaching the pump, screw in each corner a little bit at a time (rotating around which screw you're putting in). Watch install vids on YouTube.

Since you're a beginner, I would not get the Corsair H90. The NZXT X41 or the H80i V2 have much easier mounting systems. And yes, the big useless fan in the front is the 200mm.

Arctic F8 or BeQuiet 80mm are both good. Arctic will move more air. BeQuiets will...well...be more quiet. The biggest thing you need to note is the max RPM. That, more than anything else, will tell you how noisy and how much air the fan will move. Everything else is a matter of degrees. The quietest 1600RPM fan on the market is still as loud as the typical 1400RPM fan. Not a big difference. Just make sure all of your fans are PWM. You don't want to deal with DC fan control right now.

In fact, you probably want to grab a couple of fan splitters so you can control the speed of the fans automatically via your motherboard, since ITX boards don't have enough plugs for all four fans.

https://www.amazon.com/Cable-Matters-2-Pack-2-Fan-Splitter/dp/B01DV1Z0Z4/

Other than that, don't worry. As your first build, it'll probably take you 3-4 hours. If you're a perfectionist like me, you'll probably hate your cabling job the first time and will want to redo it. That's all okay. Take your time, read the instructions (and watch tutorials if necessary), and it'll be fine. Better than paying someone $200 to do it for you.

Using math, the solutions with the least amounts of splitters would be two 2 to 1 splitters, or one 3 to 1 splitter.

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Just get a splitter that looks high quality enough and is actually PWM (4 Pin).

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Here are some links:

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Cable Matters 2 to 1 splitter, 2 pack

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SDTC Tech 3 to 1 splitter, 1 pack