The PCI cards are going to be your best bet to make sure you get full functionality of the USB C port on your case. A USB 2.0 adapter is going to limit what devices can be plugged in due to power delivery issues. That said, for what you are describing the use for, which is just for plugging in headphones, you will be fine. with any of those options. Answer from DASRH on reddit.com
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Reddit
reddit.com › r/pcmasterrace › usb2.0 9pin adapter to usb-c gen2 ?
r/pcmasterrace on Reddit: USB2.0 9pin adapter to USB-C Gen2 ?
September 6, 2022 -

Hello, I have the case Fractal Design Define 7XL and my mobo does not have the usb 3.1 gen2 port

so I want to buy a pci express card in order to use the usbc port in the front panel of the case.

I need to use the port with my oneplus usbc DAC cable (this one amazon.co.uk/dp/B07PFT2HNP) for my headphones.

I found 3 solutions (I would like to solve the problem with the minimum expense):

  • this simple adapter usb2.0 9pin to usb 3.2 Gen1 amazon.com/dp/B09MYVJX4C

  • this card usb3.0 Type-E amazon.com/dp/B09YL8XG5D

  • this card usb3.1 Gen2 amazon.com/dp/B0B156WMGC (this could be the perfect compatibility but the less cheap)

I have some doubts:

  1. What are the downside (in terms of lost features of the oneplus DAC cable) of having a usb2.0 9pin connected to a usb 3.0 gen2 using that adapter? Is the cable properly powered? Do I lose some feature of the cable in your opinion?

  2. If I use the card usb3.0 Type-E, there could be incompatibilities or losing features of the cable?

  3. is the latest usb3.1 Gen2 card the perfect one in terms of compatibility? (I have a pci-e 1x in my MOBO MSI M5 Z170A where to plug the card in)

What do you think about these 3 solutions? Do you have suggestions?

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Amazon
amazon.com › CERRXIAN-Pin-USB-Motherboard-Converter › dp › B0DCFT6Y4D
Amazon.com: CERRXIAN 9 Pin USB Motherboard Female Header to USB C Adapter Cable, 90 Degree Angle Type C Male to 9Pin Motherboard Serial Female 24AWG Extender Converter Braided Cable (2-Pack) 2FT/60CM : Electronics
Buy CERRXIAN 9 Pin USB Motherboard Female Header to USB C Adapter Cable, 90 Degree Angle Type C Male to 9Pin Motherboard Serial Female 24AWG Extender Converter Braided Cable (2-Pack) 2FT/60CM: USB Cables - Amazon.com ✓ FREE DELIVERY possible ...
Discussions

ISO!! usb 9 pin internal motherboard male header to type c cable
Is this the cable you're asking for? More on reddit.com
🌐 r/pcmasterrace
8
2
February 10, 2024
USB-C 3.1 MINI 20pin connector to USB-A 2.0 9pin header
You'll be better off getting a pcie card that has a gen 2 internal header on it, that way you can get gen 2 speeds from your type-c port. It'll take a pcie slot off your motherboard, but I think it's worth it if you have one to spare. Amazon has two that I know of, one from Ableconn and another from Silverstone technology (the Silverstone needs a x2 slot, while Ableconn needs an x4) More on reddit.com
🌐 r/UsbCHardware
8
5
May 6, 2020
USB2.0 9pin adapter to USB-C Gen2 ?
The PCI cards are going to be your best bet to make sure you get full functionality of the USB C port on your case. A USB 2.0 adapter is going to limit what devices can be plugged in due to power delivery issues. That said, for what you are describing the use for, which is just for plugging in headphones, you will be fine. with any of those options. More on reddit.com
🌐 r/pcmasterrace
5
2
September 6, 2022
Where do i find a 9 pin usb plug in my pc
Remember to check our discord where you can get faster responses! https://discord.gg/EBchq82 I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com
🌐 r/pchelp
93
105
August 20, 2024
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Performance-PCs
performance-pcs.com › usb 9 pin internal motherboard female header to usb 3.1 type c adaptor -20"
USB 9 Pin Internal Motherboard Female Header to USB 3.1 Type C Adaptor MB9F-USBC
USB 9 Pin Internal Motherboard Female Header to USB 3.1 Type C Adaptor -20"
A custom made product that can connect the USB 9-pin male headers from any motherboard, and convert it to USB Type-C connector.
Price   $10.99
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AliExpress
aliexpress.com › item › 1005004291872220.html
Motherboard USB2.0 9Pin to TYPE-C A-KEY Front Connector Converter USB3.2 TYPE-E Interface Header Adapter USB 2.0 Extender Card - AliExpress 7
1 month ago - Usb Type C Female To Lightning Male Adapter Amazon|Usb C Port Notes Working Mac|USB2.0 9PIN to TYPE-C Interface:Seamlessly convert your motherboard's USB2.0 9PIN to a TYPE-C front A-KEY interface for versatile connectivity.
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Amazon
amazon.com › Converter-Adapter-Connector-Compatible-Windows › dp › B083QWL13V
Amazon.com: USB Type C to RS232 DB9 Serial(9-Pin) Converter Adapter Cable 5ft with a Male to Female Connector, Compatible with MAC OS, Windows, Android, Linux Type C Device (USB C) : Electronics
Amazon.com: USB Type C to RS232 DB9 Serial(9-Pin) Converter Adapter Cable 5ft with a Male to Female Connector, Compatible with MAC OS, Windows, Android, Linux Type C Device (USB C) : Electronics
🌐
Amazon
amazon.com › 9-pin-usb-adapter › s
Amazon.com: 9 Pin To Usb Adapter
Explore a wide range of 9 pin to USB adapters. Find the right converter for your device compatibility requirements.
Top answer
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Possibly yes. That IDC connector is basically just the same electrical connections but just in a compact connector for motherboard connection use. Just look at this image taken from this Amazon listing for a, StarTech USB A to USB Motherboard 4-Pin Header F/F 2.0 Cable, 6" (USBMBADAPT):

Note the exposed wires as well as the text on the motherboard header connector. That’s your big clue! So basically if you wanted to clip off the connectors on your device and wire them to a male USB that could be done as long as you match data and power wires correctly.

And if you are afraid of doing that yourself, you could purchase this: “Adapter Cable, USB 2.0, IDC 5 Male (single row) to USB A Male”:

And as the description for the product states:

Used to connect devices designed to plug into USB motherboard header pins to an external USB 2.0 connector

That’s actually a neat tool because you can now use the device as you wish without having to mangle the cable; just plug the female IDC connector into the male IDC connector and bingo! You have a USB device.

But since your device has 10 connectors you would need two of those cables to make that reader fully work. It could be that one connector has certain media reader slots and the other handles others; so maybe scoring one cable and experimenting might be the way to go.

EDIT: An addition, but here is a cool image of how someone was able to use one of those male male IDC motherboard header connector cables to connect to a USB flash drive with a broken connector. This shows clearly what all 5 connectors are: 2 are data, 2 are power and 1 is for the grounding/shielding.

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Just for anyone looking for a way to do it:

Thanks to

I managed to get the cables right. As soon as I plugged windows started installing various generic drivers... YAY!!! Here's what I got:

But now Usb doesn't work and I cannot find the right slot for Mini Usb....

Find elsewhere
🌐
Reddit
reddit.com › r/pcmasterrace › iso!! usb 9 pin internal motherboard male header to type c cable
r/pcmasterrace on Reddit: ISO!! usb 9 pin internal motherboard male header to type c cable
February 10, 2024 -

LIAN li lcd ga ii sl-inf shipped with out the cable to connect screen pump to motherboard. Plan is to try to file a claim but they’re out of the office until the 15th. Shopped around and couldn’t find it. Figured if anyone knew y’all did.

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MODDIY
moddiy.com › products › 6632 › USB-3.1-Type-C-Female-to-USB-9-Pin-Female-Internal-Male-Header-Adaptor.html
USB 3.1 Type C Female to USB 9 Pin Female Internal Male Header Adaptor - MODDIY
USB 3.1 Type C Female to USB 9 Pin Female Internal Male Header Adaptor
Buy USB 3.1 Type C Female to USB 9 Pin Female Internal Male Header Adaptor for $12.99 with Free Shipping Worldwide (In Stock)
(4.7)
Price   $12.99
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eBay
ebay.com › electronics › computers/tablets & networking › computer cables & connectors › usb cables, hubs & adapters
USB 9PIN to Type-C Front Panel Cable USB 9PIN to TYPE-E KEY-A Adapter Cable9130 | eBay
USB 9PIN to Type-C Front Panel Cable USB 9PIN to TYPE-E KEY-A Adapter Cable9130
Anker 332 (A8355011) USB-C 5-In-1 4K HDMI 85W Hub Adapter - Black · 9 Pin to USB Adapter · USB-C Male · 30 Pin to USB C · Adapter USB to Type C · USB C to 8 Pin Adapter · USB Type-C Connector · USB A Type Cable · 9 Pin USB Splitter · ...
Price   $11.91
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eBay
ebay.com.au › electronics › computers/tablets & networking › computer cables & connectors › usb cables, hubs & adapters
USB 2.0 Front Panel Header 9pin to USB C TypeE Internal Adapter for Motherboard | eBay Australia
USB 2.0 Front Panel Header 9pin to USB C TypeE Internal Adapter for Motherboard
Features: USB2.0 Front 9PIN to USB C adapter, convenient to convert traditional USB port to USB C port for wider compatibility and connectivity. Specifications: Item:USB2.0 Front 9PIN to USB C/TypeE Adapter.
Price   A$17.78
🌐
Best Buy
bestbuy.com › site › searchpage.jsp
9 pin to usb - Best Buy
Shop for 9 pin to usb at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up
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Romtronic
romtronic.com › home › usb-c to rs-232 (db9) adapter cable: pinout, wiring, and grounding guide
USB-C to RS-232 (DB9) Adapter Cable: Pinout, Wiring, and Grounding Guide | Romtronic
August 29, 2025 - A USB-C to RS-232 (DB9) adapter brings back that classic COM port to modern computers. These adapters let your laptop’s USB‑C port talk to serial peripherals (modems, routers, industrial gear, etc.) via a standard 9‑pin D‑sub (DB9) connector.
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Newegg
newegg.com › p › pl
usb 9 pin adapter | Newegg.com
RIITOP USB 2.0 to USB 3.2 Gen 1 Header Adapter [2-Pack], Internal 9Pin Female to USB 3.1 Type-E (A-Key) Female Converter for Extending USB C Ports on Front Panel of PC ... 4 in 1 Internal USB Splitter Cable, Electop 9 pin USB Header Male 1 to ...
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eBay
ebay.com › shop › 9-pin-to-usb-adapter
9 Pin to USB Adapter | eBay
Explore a wide range of our 9 Pin to USB Adapter selection. Find top brands, exclusive offers, and unbeatable prices on eBay. Shop now for fast shipping and easy returns!
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Campbell Scientific
campbellsci.com › 17394-cable
17394 - Converter, USB to DB9 Pin (Male) RS-232
The 17394 is a six-foot interface cable fitted with a USB connector on one end and a 9-pin pin (male) RS-232 connector on the other end. The USB connector attaches to the USB port of a PC.
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Reddit
reddit.com › r/usbchardware › usb-c 3.1 mini 20pin connector to usb-a 2.0 9pin header
r/UsbCHardware on Reddit: USB-C 3.1 MINI 20pin connector to USB-A 2.0 9pin header
May 6, 2020 -

I have a NZXT H510 case and a MSI B450 Tomahawk Max motherboard.

The cases front I/O ports are:
1 x USB 3.1 Gen 2 Type-C
1 x USB 3.1 Gen 1 Type-A

The motherboards connectors are:
2 x USB 2.0
1 x USB 3.2 Gen 1

I have connected the cases Gen 1 port to the mobos Gen 1 connector, and I have nothing to connect the cases Gen 2 port to. Therefore I would like to add an adapter from the cases Gen 2 port to one of the mobos USB 2.0 connectors. But I can't find any such adapter anywhere.
I have considered combining a "9pin female to 20pin male" with a "20pin female to 20pin mini male".

Does anyone have any suggestions?

🌐
Eaton
tripplite.eaton.com › products catalog › usb adapters › u209005c
USB-C to Serial Adapter Cable - RS232, DB9, 5-ft. | Eaton
Connect a device with a 9-pin RS-232 serial port to the USB Type-C port on your computer, laptop, tablet or smartphone.