--- product_id: 642386460 title: "JMT Support External Graphics Card M.2 M-Key to PCIE 4.0X4, Compatible with Oculink/M.2 NVMe Laptop eGPU?GDP Handheld (Dock-OC4)" brand: "jmt" price: "£57.18" currency: GBP in_stock: true reviews_count: 5 category: "Jmt" url: https://www.desertcart.co.uk/products/642386460-jmt-support-external-graphics-card-m-2-m-key-to store_origin: GB region: United Kingdom --- # PCIe 4.0 x4 Gen4 bandwidth 90-95% compatibility with M.2/Oculink devices Supports ATX/SFX 500W+ power supply JMT Support External Graphics Card M.2 M-Key to PCIE 4.0X4, Compatible with Oculink/M.2 NVMe Laptop eGPU?GDP Handheld (Dock-OC4) **Brand:** jmt **Price:** £57.18 **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your laptop’s power game with JMT’s sleek PCIe expansion adapter! ## Quick Answers - **What is this?** JMT Support External Graphics Card M.2 M-Key to PCIE 4.0X4, Compatible with Oculink/M.2 NVMe Laptop eGPU?GDP Handheld (Dock-OC4) by jmt - **How much does it cost?** £57.18 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/642386460-jmt-support-external-graphics-card-m-2-m-key-to) ## 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 - • **Powerful Yet Compact:** Supports small 1U power supplies (500W+), keeping your setup sleek without sacrificing power. - • **Proven Compatibility:** Trusted by 90-95% of M.2 and Oculink laptops and handhelds—join the elite users expanding their device’s potential. - • **Smart Start/Stop Sync:** Effortlessly syncs power with your host device for smooth operation—no hot-swap, but zero hassle. - • **Universal Expansion Hub:** Seamlessly connect GPUs, network, sound, and capture cards via Oculink or M.2 ports for ultimate versatility. - • **Blazing Fast PCIe 4.0 x4 Speed:** Unlock next-gen GPU and expansion card performance with ultra-low latency and max bandwidth. ## Overview The JMT Support External Graphics Card M.2 M-Key to PCIe 4.0x4 adapter enables high-speed expansion of GPUs and other PCIe cards via Oculink or M.2 NVMe ports. Designed for professional-grade setups, it supports PCIe Gen4 x4 bandwidth, requires a 500W+ ATX/SFX power supply, and offers 90-95% compatibility with laptops and handhelds featuring Oculink or M.2 ports. Its unique start/stop functionality syncs with the host device, making it a versatile and powerful solution for mobile eGPU and PCIe expansion needs. ## 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: 1 of 4 worked. DO NOT BUY - first worked. Need smaller, two fan gpus for these docks and no oculink cable is included. Tight fit but that may protect gpu if you move it. NEXT THREE I BOUGHT DID NOT WORK!!!! Review: Fantastico - Works great. Magnetic bottom is a nice touch for setting on metal rack shelving. No issues at all been running a couple weeks now. ## 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 | | Additional Features | Unique Start/Stop Functionality | | Best Sellers Rank | #106,552 in Computers ( See Top 100 in Computers ) #846 in Graphics Cards | | Brand | JMT | | Color | Black | | Colour | Black | | Compatible Devices | Desktop, Laptops | | Compatible Phone Models | Universal | | Compatible devices | Desktop, Laptops | | Compatible phone models | Universal | | Customer Reviews | 4.3 out of 5 stars 60 Reviews | | Enclosure Material | Plastic Metal | | Global Trade Identification Number | 00783798005388 | | Item Weight | 0.32 Kilograms | | Manufacturer | JMT | | Mfr Part Number | F51620 | | Model Name | AMD Radeon RX 6800 XT | | Model Number | F51620 | | Mounting Type | Tabletop Mount | | Mounting type | Tabletop Mount | | Special features | Unique Start/Stop Functionality | | UPC | 783798005388 078379800538 | ## Product Details - **Brand:** JMT - **Colour:** Black - **Compatible devices:** Desktop, Laptops - **Compatible phone models:** Universal - **Mounting type:** Tabletop Mount ## Images ![JMT Support External Graphics Card M.2 M-Key to PCIE 4.0X4, Compatible with Oculink/M.2 NVMe Laptop eGPU?GDP Handheld (Dock-OC4) - Image 1](https://m.media-amazon.com/images/I/51iEVpWlzmL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐ 1 of 4 worked. DO NOT BUY *by M***A on 10 February 2026* first worked. Need smaller, two fan gpus for these docks and no oculink cable is included. Tight fit but that may protect gpu if you move it. NEXT THREE I BOUGHT DID NOT WORK!!!! ### ⭐⭐⭐⭐⭐ Fantastico *by R***. on 16 May 2026* Works great. Magnetic bottom is a nice touch for setting on metal rack shelving. No issues at all been running a couple weeks now. ### ⭐⭐⭐⭐⭐ 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. ## 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) - chenyang SFF-8611 Cable OCuLink PCIe PCI-Express 4.0 SFF-8611 4i Male to SFF-8611 Male Data Extension Cable 50cm for eGPU GPD Win Max2 External Graphics Card & SSD - CY Cable OcuLink PCIe PCI-Express SFF-8611 4i to OcuLink SFF-8611 SSD Data Active Cable 50cm --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/642386460-jmt-support-external-graphics-card-m-2-m-key-to](https://www.desertcart.co.uk/products/642386460-jmt-support-external-graphics-card-m-2-m-key-to) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-29*