---
product_id: 91217967
title: "Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129)"
brand: "syba"
price: "40530CFA"
currency: XOF
in_stock: true
reviews_count: 8
url: https://www.desertcart.sn/products/91217967-dual-m-2-m-key-nvme-ports-to-pcie-3
store_origin: SN
region: Senegal
---

# PCIe 3.0 x8 upstream bandwidth Dual M.2 NVMe x4 lanes each Up to 6,500 MB/s transfer speed Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129)

**Brand:** syba
**Price:** 40530CFA
**Availability:** ✅ In Stock

## Summary

> 🚀 Unlock PCIe Power: Double NVMe Speed, Zero Compromise!

## Quick Answers

- **What is this?** Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) by syba
- **How much does it cost?** 40530CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/91217967-dual-m-2-m-key-nvme-ports-to-pcie-3)

## Best For

- syba enthusiasts

## Why This Product

- Trusted syba brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Accelerate Storage by 20x:** Experience transfer speeds up to 6,500 MB/s, leaving SATA SSDs in the dust.
- • **Maximize NVMe Performance:** Dedicated PCIe 3.0 x4 lanes for each M.2 SSD unlock full speed potential without motherboard bifurcation.
- • **Dual M.2 Ports in One Slot:** Double your NVMe storage density with two M.2 drives on a single PCIe x16 slot.
- • **Future-Proof Your Workstation:** Compatible with Windows and Linux, backed by a 3-year warranty for peace of mind.
- • **Plug & Play on Non-Bifurcation Boards:** Works seamlessly on systems lacking PCIe bifurcation support—no BIOS hacks needed.

## Overview

The SI-PEX40129 is a high-performance PCIe 3.0 x16 riser card featuring ASMedia ASM2824 switches that enable two M.2 NVMe SSDs to run at full PCIe 3.0 x4 bandwidth each. Designed for non-bifurcation motherboards, it bypasses traditional lane limitations to deliver blazing transfer speeds up to 6,500 MB/s, making it ideal for professionals seeking to supercharge storage on legacy or modern systems without sacrificing compatibility.

## Description

The I/O CREST SI-PEX40129 is a great accelerated secondary storage solution for any workstation with true PCIe 3.0 x8 bandwidth (x16 Interface). It has two M.2 NVMe ports to accept two NVMe M.2 SSDs, so each NVMe M.2 SSD has dedicated PCIe 3.0 x4 bus bandwidth. It delivers transfer speeds 20 times faster than SATA SSDs. By by-passing the traditional PCIe 3.0 x4 NVMe solutions, using the SI-PEX40129 will allow user add 2 M.2 NVMe into any non-Bifurcation PCIe x16 slot to achieve their full potential with a bandwidth of up to 6,500 MB/s.Unlike onboard DMI 3.0 based NVMe solutions or Single NVMe PCI-e x4, which are forced to share a single PCIe 3.0 x4 lane with the motherboard's data ports, the SI-PEX40129 combines 2- M.2 drives to be able to run on PCIe 3.0 x16 lane. This unique architecture allows the drive to interface directly with the platform's CPU, which provides PCIe x4 bandwidth for each NVMe SSD!

Review: if you are looking for the maximum performance out of your PCIe 3.0 M.2's this is THE card for you. - I purchased two of these boards. Each board has the option for two M.2 drives. They provide amazing performance on my older i7 board which only has PCIe 2.0a support. My previous M.2 board did not have the onboard chip which is apparently a PCIe lane "switch" which basically allows more use of the slot bus. The M.2 cards I installed are PCIe 3.0 x4 cards so on my old card this would translate to PCIe 2.0 x4 since the motherboard did not support PCIe 3.0. Due to the fact that each PCIe 3.0 "lane" is twice the speed of a PCIe 2.0 lane I would not get half the performance. The onboard "switch" processor allows use of more lanes and allows near PCIe 3.0 performance. Keep in mind that having two M.2's on one card mean they still share the slot bandwidth. Windows does not support booting from software created striped volumes and the cards don't have a RAID chip on them to create hardware RAID. Actually, I wish this card did support hardware RAID such as striped volumes, it would be a great feature. What I did is purchase two cards and placed four M.2's on them. I placed my C drive on one (Windows). Then I placed a smaller cheaper M.2 on the second card as extra storage because due to the PCIe "lane switching" placing only one M.2 on the card will cause lockups and system freezes. In slot two on both cards I place high speed 1TB M.2's and created a striped volume. Placing them on separate cards allow them to utilize separate "switch" processors to ensure maximum performance. Then I reinstalled Windows and interrupted the installation to set the Users and Program folders to my striped volume. Then on my first login, I moved the page file to my striped volume. Now I have maximum performance out of my two M.2's with a total 2 TB on the striped volume. Thus far the setup works great HDD access is amazingly fast and probably faster than anything the creators of this motherboard expected. Also, I created a large 50-100 GB swap file because the drive is really fast so paging does not provide a noticeable slow down and effectively gives me all the memory space I need. I typically just leave everything open and running allowing me to quickly return to things. Overall, if you are looking for the maximum performance out of your PCIe 3.0 M.2's this is THE card for you. Pros: - On a PCIe 2.0 system this is likely the fastest way to add an M.2 HDD - Allows extreme performance even on a PCIe 3.0 slot. - PCIe lane Switch processor allows nearly full use of the slot - M.2 Cooling features like thermal pads heat spreader and fan. - Allows two (or more) M.2's in one slot (a lot of other cheaper cards have one M.2 one slot) Cons: - Does not have hardware RAID, I realize this may require a different processor, but it is a big feature. - Requires both M.2 slots to be populated due the PCIe lane switching. - While the SATA hard drive interface comes on the motherboard this requires the purchase of a 200 dollar card.
Review: Good value - Incidible value if you can find m.2 SSDs for cheap. Useful to add fast storage in the bottom pcie slot of your motherboard if you need it and have the extra pcie lanes. Careful with adding a 5th drive however, especially if you do a redundant raid configuration. All five drives under load will slow the whole array down due lane constraints. It works best in a storage pool without redundancy.

## Features

- AS Media's ASM2824 has a PCIe 3.0 x8 upstream port as well as 2 PCIe 3.0 x4 downstream ports. The switch is designed primarily for storage devices.
- SI-PEX40129 card uses ASM2824 switches and therefore does not rely on PCIe bifurcation supported by CPU or PCH (they will work on closed end systems that have limited PCIe bifurcation capabilities).
- Dedicated PCIe 3.0 x8 bus bandwidth fully maximizes NVMe SSDs performance
- Delivers unprecedented fast transfer speed via intelligently aggregated Dual x4 PCIe 3.0 bus bandwidth
- NVMe RAID is supported base on the motherboard chipsets

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07HYZY7P2 |
| Best Sellers Rank | #1,438 in Computer Motherboards |
| Brand | Syba |
| Built-In Media | (1) Dual M.2 to BiFurcation PCIe x16 Adapter, (1) M.2 Mounting Screws, (1) Screw Driver |
| Compatible Devices | Personal Computer |
| Customer Reviews | 3.9 out of 5 stars 188 Reviews |
| Global Trade Identification Number | 00857426008017 |
| Hardware Interface | PCI, PCIE x 4 |
| Item Height | 1 inches |
| Item Type Name | Dual M.2 M-key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) |
| Item Weight | 0.9 Pounds |
| Manufacturer | Syba |
| Model Number | SI-PEX40129 |
| Operating System | Windows, Linux |
| Style | 2-Port M2 M-Key |
| Style Name | 2-Port M2 M-Key |
| UPC | 857426008017 |
| Warranty Description | 3 Year Warranty |

## Product Details

- **Brand:** Syba
- **Hardware Interface:** PCI, PCIE x 4
- **Style:** 2-Port M2 M-Key
- **Item Weight:** 14.4 ounces
- **Compatible Devices:** Personal Computer

## Images

![Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) - Image 1](https://m.media-amazon.com/images/I/41W6L11h-ML.jpg)
![Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) - Image 2](https://m.media-amazon.com/images/I/41ZT7ahwI5L.jpg)
![Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) - Image 3](https://m.media-amazon.com/images/I/5193AsbrCpL.jpg)
![Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) - Image 4](https://m.media-amazon.com/images/I/51P8E72zrCL.jpg)
![Dual M.2 M-Key NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard (SI-PEX40129) - Image 5](https://m.media-amazon.com/images/I/51o+hCYOGAL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ if you are looking for the maximum performance out of your PCIe 3.0 M.2's this is THE card for you.
*by A***A on June 5, 2021*

I purchased two of these boards. Each board has the option for two M.2 drives. They provide amazing performance on my older i7 board which only has PCIe 2.0a support. My previous M.2 board did not have the onboard chip which is apparently a PCIe lane "switch" which basically allows more use of the slot bus. The M.2 cards I installed are PCIe 3.0 x4 cards so on my old card this would translate to PCIe 2.0 x4 since the motherboard did not support PCIe 3.0. Due to the fact that each PCIe 3.0 "lane" is twice the speed of a PCIe 2.0 lane I would not get half the performance. The onboard "switch" processor allows use of more lanes and allows near PCIe 3.0 performance. Keep in mind that having two M.2's on one card mean they still share the slot bandwidth. Windows does not support booting from software created striped volumes and the cards don't have a RAID chip on them to create hardware RAID. Actually, I wish this card did support hardware RAID such as striped volumes, it would be a great feature. What I did is purchase two cards and placed four M.2's on them. I placed my C drive on one (Windows). Then I placed a smaller cheaper M.2 on the second card as extra storage because due to the PCIe "lane switching" placing only one M.2 on the card will cause lockups and system freezes. In slot two on both cards I place high speed 1TB M.2's and created a striped volume. Placing them on separate cards allow them to utilize separate "switch" processors to ensure maximum performance. Then I reinstalled Windows and interrupted the installation to set the Users and Program folders to my striped volume. Then on my first login, I moved the page file to my striped volume. Now I have maximum performance out of my two M.2's with a total 2 TB on the striped volume. Thus far the setup works great HDD access is amazingly fast and probably faster than anything the creators of this motherboard expected. Also, I created a large 50-100 GB swap file because the drive is really fast so paging does not provide a noticeable slow down and effectively gives me all the memory space I need. I typically just leave everything open and running allowing me to quickly return to things. Overall, if you are looking for the maximum performance out of your PCIe 3.0 M.2's this is THE card for you. Pros: - On a PCIe 2.0 system this is likely the fastest way to add an M.2 HDD - Allows extreme performance even on a PCIe 3.0 slot. - PCIe lane Switch processor allows nearly full use of the slot - M.2 Cooling features like thermal pads heat spreader and fan. - Allows two (or more) M.2's in one slot (a lot of other cheaper cards have one M.2 one slot) Cons: - Does not have hardware RAID, I realize this may require a different processor, but it is a big feature. - Requires both M.2 slots to be populated due the PCIe lane switching. - While the SATA hard drive interface comes on the motherboard this requires the purchase of a 200 dollar card.

### ⭐⭐⭐⭐⭐ Good value
*by T***S on December 18, 2025*

Incidible value if you can find m.2 SSDs for cheap. Useful to add fast storage in the bottom pcie slot of your motherboard if you need it and have the extra pcie lanes. Careful with adding a 5th drive however, especially if you do a redundant raid configuration. All five drives under load will slow the whole array down due lane constraints. It works best in a storage pool without redundancy.

### ⭐ Caused unstable Mac Pro computer
*by J***. on October 10, 2019*

Installed in 2009 Mac Pro tower with 2 AData 512GB NVMe SSDs, planning to use one for Mac OS and the other for Windows 10 Pro. Initially worked great as speedy non-boot drives. Attempts to use as a Bootcamp drive for Windows 10 completed install but would not boot. As a Mac OS 10.13.16 High Sierra boot disk it would boot with significant delay, resulting in a slower boot time than my Sata SSD. Occasionally the system would refuse to boot. I'd have to use the startup option key and force boot from the Sata SSD. After 2 months, the drives disappeared from the desktop and then the machine would not boot if the card was installed. I separately tested the SSDs and they were fine. I am assuming it is broken - a waste of money.

## Frequently Bought Together

- I/O CREST SI-PEX40129 Dual M.2 NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-Bifurcation Motherboard
- GLOTRENDS PA09-HS M.2 NVMe to PCIe 4.0 X4 Adapter with M.2 Heatsink for 2280/2260/2242/2230 M.2 NVMe SSD
- GLOTRENDS PA21 Dual M.2 NVMe to PCIe 4.0 X8 Adapter Without PCIe Bifurcation Function, Support 22110/2280/2260/2242/2230 Size (PCIe Bifurcation Motherboard is Required)

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-03-05*