Thin mini-ITX powered PCIe riser 4x to 16x

Hi everyone,

@BillBaroud and I partnered with C_Payne from [H] to design and develop a reversed thin mini-ITX PCIe riser, allowing you to add a discrete GPU to your thin mini-ITX system.

We have currently 5 risers for sale.
We also have a 16x to 16x riser available.

We are asking 35€ per unit, excl. shipping (from France).

Original prototypes of both risers

Finished products with screw terminals for solderless operations

Please find hereafter some more explanations regarding this riser, which you can discuss on the original thread.

1. Three main features

- The riser allows your card to fold just over the IO to allow for very compact builds.

- Riser is powered since the on-board PCIe 4X slot cannot provide more than 25W. This is why the +12V line from the slot has been cut so that ALL the power your GPU needs (both slot and PCIe connectors) will be provided by the 12V source of your choosing.

- The riser integrates a MOSFET switch, based on a powerful BTS555 chip rated for 165A.
This circuit is triggered by the motherboard (not extra wire) and switches ON the +12V to the GPU when the computer starts, and switches OFF the +12V when the computer shuts down.

To sum up, no +12V will be applied to the GPU when the computer is turned OFF.

Riser Principle

The riser can be powered by any 12V source, such as AC-DC Adapters, Open-Frame PSUs, DC-DC boards such as HDPLEX, etc.

2. How to hook it up

- Input : two screw-on terminals, to let you easily connect the riser to your 12V source.
Alternatively, input wires can also be soldered (as seen on the prototypes).
- Output : one 8-Pin Mini-Fit Jr connector, to power your GPU or anything that needs 12V (fans, etc.).

Hereafter you will find some possible use case scenarios.

3. Some use case scenarios

Gigabyte GA-H110TN motherboard with a single 12V 10A AC adapter, powering a G4600T and a 750 Ti.
Great set up for ~ 120W builds. Only two wires !

- For more demanding hardware, you can use a Meanwell EPP-300-12...

... Or a HDPLEX board if you happen to use an Asrock thin mini-ITX motherboard (19V input only) with a GTX 1060.

Thanks for your attention !
Last edited:


Case Bender
New User
Jul 19, 2018
Hi there,
I would like to purchase one of these amazing riser. Do you still have them in stock? I would like a x4 to x16 riser.
Thanks in advance!


King of Cable Management
Original poster
Piccolo PC
Feb 16, 2016
Hi there,

Sure, I have some stock left !
What kind of project do you have in mind ?


King of Cable Management
Jun 22, 2018

Would you be able to provide measurements for a completed board?

I am trying to figure out if / how I could fit this into my build.


King of Cable Management
Jun 22, 2018
Thanks, reviewed it and looks like the card is too big. I have a max of 30mm clearance so it’s out I’m afraid.

I now need to find a 20cm powered x4 to x4 riser cable. They don’t seem to exist,


King of Cable Management
Jun 22, 2018
The one on the left if it had a length over 20cm would be perfect.

Could you point me in the direction of where I can get them from? It’s got to be that angle (rather than 90 degree) to the cable to fit.


King of Cable Management
Jun 22, 2018
I think the model im after is a R22SF-WK, I think thats the model with the power.

That is a sata powered x4 to x4 riser card, the ones linked are un-powered

Thanks so much for the help, I have contacted a few sellers on there to request that specific model.


Chief Procrastination Officer
SFFn Staff
Jun 29, 2015
I have a noob question about input power. Do I need an ATX compliant 12V source for the riser to work properly ? Or any 19V to 12V step-down would do ?

I'm especially worried about ripple. Didn't have the time to use the riser I bought from you, but I'm starting to think about it.

I have an Asus Q87T and I'd like to use the 2pins header as voltage out to feed a step-down or a Dynamo (might be Overkill, but supplied voltage would be cleaner) to supply the riser with 12V DC.

What would you suggest ?