---
product_id: 602847556
title: "JMT M.2 M-Key to PCIE 4.0X4 External Graphics Card Stand Bracket Compatible with Oculink/M.2 NVMe Laptop eGPU GDP Handhelds (Dock-OC4)"
brand: "jmt"
price: "€ 89.57"
currency: EUR
in_stock: true
reviews_count: 6
category: "Jmt"
url: https://www.desertcart.ie/products/602847556-jmt-m-2-m-key-to-pcie-4-0x4-external
store_origin: IE
region: Ireland
---

# PCIe 4.0 x4 Gen4 bandwidth Supports ATX/SFX 500W+ power supply Oculink & M.2 NVMe compatibility JMT M.2 M-Key to PCIE 4.0X4 External Graphics Card Stand Bracket Compatible with Oculink/M.2 NVMe Laptop eGPU GDP Handhelds (Dock-OC4)

**Brand:** jmt
**Price:** € 89.57
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your laptop’s power game—because your GPU deserves the upgrade it’s been waiting for!

## Quick Answers

- **What is this?** JMT M.2 M-Key to PCIE 4.0X4 External Graphics Card Stand Bracket Compatible with Oculink/M.2 NVMe Laptop eGPU GDP Handhelds (Dock-OC4) by jmt
- **How much does it cost?** € 89.57 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/602847556-jmt-m-2-m-key-to-pcie-4-0x4-external)

## Best For

- jmt enthusiasts

## Why This Product

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

## Key Features

- • **Proven Compatibility:** 90%+ success rate with M.2 laptops and handhelds ensures your gear plays nice out of the box.
- • **Plug & Play Expansion:** Easily connect GPUs, network, sound, and capture cards via Oculink or M.2 ports—perfect for laptop eGPU upgrades.
- • **Blazing PCIe 4.0 x4 Speeds:** Unlock ultra-fast Gen4 bandwidth for seamless GPU and PCIe card expansion.
- • **Compact & Efficient Design:** Slim external bracket fits small form factors without built-in power, keeping your setup sleek and powerful.
- • **Universal Power Flexibility:** Works with ATX, SFX, and 1U power supplies over 500W for stable, high-performance setups.

## Overview

The JMT M.2 M-Key to PCIe 4.0 x4 External Graphics Card Stand Bracket is a cutting-edge adapter designed to expand your laptop or handheld’s capabilities by enabling external GPU and PCIe card connectivity via Oculink or M.2 NVMe ports. Supporting PCIe Gen4 x4 speeds and flexible power supply options (ATX/SFX 500W+), it offers a reliable, compact solution for professionals and gamers seeking high-performance graphics and peripheral expansion without replacing their entire system.

## Description

JMT M.2 M-Key to PCIE 4.0X4 External Graphics Card Stand Bracket Compatible with Oculink / M.2 NVMe Laptop eGPU GDP Handhelds Product Description: 1, O culink adapter board, support devices with O culink port to expand PCIE card. 2, Support M.2 port, through the standard O culink extension cable to PCIE card. 3, Support expanding GPU graphics card, PCIE network card, PCIE sound card, PCIE capture card, etc. PCIE array card only supports X4 devices. 4, The maximum bandwidth speed is PCIE 4.0 X4 GEN4, backward compatible with GEN3. 5, Support ATX\SFX\small 1U power supply, the adapter board only needs to be inserted into the 24P power supply, the graphics card power supply is provided by other power supplies. Power supply should be 500W and above. 6, Support synchronous start and stop following the host, does not support hot-swap. 7, Only GDP handhelds with o culink ports have been successfully tested for compatibility, other hosts with O culink ports are still being collected. 8, The successful compatibility rate is 90% for laptops with M.2 ports, 95% for small hosts with M.2 ports, and 95% for other hosts. 9, This series of kit products do not include O culink extension cable, need to purchase separately. 10, This series of boxes do not support built-in power supply, and limit the size of the graphics card.

Review: Was apprehensive but it works well - Was initially a little apprehensive about this - I needed more vram for diffusion models, and didn't have a fortune to spend on a new gaming pc (I have a not so old MSI Raider GE76 12UH, but with only 8gb of vram). I'd only read about epgu's, and managed to snag a second hand RTX 3090 at a reasonable price. I decided to take the plunge. I plugged it all together, and turned on with always on switch on (I should note I was using a different m2 oculink card in my laptop) and booted up. Immediately device manager sees a generic windows display adapter. Reinstalled drivers, now device manager sees a RTX 3090, but stopped with error 43. Did some googling, and found and ran the error 43 fixer - did it's thing, but still reported the same error. Uninstalled and reinstalled the driver cleanly - still no luck. Went back to basics - tried swapping out my old m2 card with the one supplied in the kit. Booted up, and voilà! RTX 3090 installed and working! Don't know if it was the card, the error fixer or a combination of both, but it now works flawlessly. I shut everything down, tried flipping the switch to auto power on when it detects power from laptop and guess what? that worked too! It might be cheap and cheerful, but I can testify it works, and am immensely relieved that it does as it saved me a fortune needing a new pc, or being stuck with a graphics card I can't use. Hooking it up together was simple - just connect the atx24 pin power connected to the board, your oculink cable in the relevant port, and your GPU into the PCI slot. Hook power up to your GPU directly. Not had a chance to test performance with games, but I'm sure people have already done that - I'm not using it for gaming, so the performance loss should be minimal and so far using flux it's a huge improvement on my own board 3080. It's a shame the kit doesn't provide a cable too, but the one shown in "people also bought this" section for another 20 quid worked just fine.
Review: Fa il suo mestiere. Su schede modeste come 4060Ti non crea neppure particolari colli di bottiglia. 3dMark ottiene punteggi pari al bus gen4 8X nativo

## Features

- Oculink compatible adapter card, supports devices with O culink port to expand PCIE card.
- Support M.2 port, through standard O culink extension cable to PCIE card.
- Support expansion GPU graphics card, PCIE network card, PCIE sound card, PCIE capture card, etc. PCIE array card only supports X4 devices.
- Support ATXSFXsmall 1U power supply, the adapter card only needs to be inserted into the?24P power supply, graphics card power is provided by other power supply.? Power supply must be 500W and above.
- This series of boxes does not support built-in power supply and limits the size of the graphics card. (Not include the O culink extension cord)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CRR7HMX5 |
| Are Batteries Included | No |
| Best Sellers Rank | 69,786 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 461 in Graphics Cards |
| Brand | JMT |
| Colour | Black |
| Customer Reviews | 4.3 4.3 out of 5 stars (44) |
| Date First Available | 8 Jan. 2024 |
| Graphics Card Description | AMD Radeon RX 6800 XT |
| Graphics Card Interface | PCI Express |
| Graphics Chipset Brand | AMD |
| Graphics Coprocessor | AMD Radeon RX 6800 XT |
| Graphics RAM Type | GDDR6 |
| Guaranteed software updates until | unknown |
| Item Weight | 320 g |
| Item model number | F51620 |
| Manufacturer | JMT |
| Operating System | Windows, Linux |
| Package Dimensions | 20.5 x 10.21 x 4.19 cm; 320 g |
| Resolution | 4K Ultra HD |
| Series | AMD Radeon RX 6800 XT |

## Product Details

- **Brand:** JMT
- **Colour:** Black
- **Compatible devices:** Desktop, Laptops
- **Compatible phone models:** Universal
- **Mounting type:** Tabletop Mount

## Images

![JMT M.2 M-Key to PCIE 4.0X4 External Graphics Card Stand Bracket Compatible with Oculink/M.2 NVMe Laptop eGPU GDP Handhelds (Dock-OC4) - Image 1](https://m.media-amazon.com/images/I/51iEVpWlzmL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Was apprehensive but it works well
*by T***6 on 20 August 2025*

Was initially a little apprehensive about this - I needed more vram for diffusion models, and didn't have a fortune to spend on a new gaming pc (I have a not so old MSI Raider GE76 12UH, but with only 8gb of vram). I'd only read about epgu's, and managed to snag a second hand RTX 3090 at a reasonable price. I decided to take the plunge. I plugged it all together, and turned on with always on switch on (I should note I was using a different m2 oculink card in my laptop) and booted up. Immediately device manager sees a generic windows display adapter. Reinstalled drivers, now device manager sees a RTX 3090, but stopped with error 43. Did some googling, and found and ran the error 43 fixer - did it's thing, but still reported the same error. Uninstalled and reinstalled the driver cleanly - still no luck. Went back to basics - tried swapping out my old m2 card with the one supplied in the kit. Booted up, and voilà! RTX 3090 installed and working! Don't know if it was the card, the error fixer or a combination of both, but it now works flawlessly. I shut everything down, tried flipping the switch to auto power on when it detects power from laptop and guess what? that worked too! It might be cheap and cheerful, but I can testify it works, and am immensely relieved that it does as it saved me a fortune needing a new pc, or being stuck with a graphics card I can't use. Hooking it up together was simple - just connect the atx24 pin power connected to the board, your oculink cable in the relevant port, and your GPU into the PCI slot. Hook power up to your GPU directly. Not had a chance to test performance with games, but I'm sure people have already done that - I'm not using it for gaming, so the performance loss should be minimal and so far using flux it's a huge improvement on my own board 3080. It's a shame the kit doesn't provide a cable too, but the one shown in "people also bought this" section for another 20 quid worked just fine.

### ⭐⭐⭐⭐⭐ Review
*by A***I on 11 March 2025*

Fa il suo mestiere. Su schede modeste come 4060Ti non crea neppure particolari colli di bottiglia. 3dMark ottiene punteggi pari al bus gen4 8X nativo

### ⭐⭐⭐⭐⭐ Review
*by G***K on 16 November 2025*

Replaced a PCI-e 3.0 dock with this one to be able to run an RTX 3060 Ti. The other dock had a very cheap plastic main plate and only some extended screws for support. This one has far better build quality and is much more stable. The magnetic legs add the cherry on top. Put some metal plate underneath and it will stick there like being glued to the ground. The 3060 runs without issues reaching benchmark scores comparable or superior to desktop builds. The cabling of the 3.0 dock caused some WiFi intereference which yielded poor results (20-50Mbs on a 250Mbs WiFi card), the oculink cable doesn't cause anything like that. The only thing that I could mention as negative that the oculink cable's plastic cover is quite big and to be able to put it the backplate of the laptop back properly I had to remove it.

## Frequently Bought Together

- JMT M.2 M-Key to PCIE 4.0X4 External Graphics Card Stand Bracket Compatible with Oculink/M.2 NVMe Laptop eGPU?GDP Handhelds (Dock-OC4)
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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-01-23*