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MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU
  • MINISFORUM ESP4B-850 PCIe Expansion Card Minisforum EU

Free Shipping

Free Shipping

Free RMA return

Free RMA return

0% APR plan

0% APR plan

2 Years Warranty

2 Years Warranty

30-Day Money-Back Guarantee

30-Day Money-Back Guarantee
Minisforum EU

ESP4B-850 PCIe Expansion Card

€149,00 €179,00
  • PCIe 4.0 ×4 Host Interface
  • 4× M.2 NVMe SSD Slots
  • 1× OCuLink & USB 3.2 Gen 2×2
  • Intel & AMD Compatible
  • ASPM Support

×
Brand Shop Exclusive Benefits ›
  • Online Instant Service
  • 3-Year Extended Warranty
  • Gift Redemption with Points
Deliverable Areas ›

Can be delivered for free to:

  • EU countries: Czech Republic, Denmark, Austria, Belgium, Bulgaria, Croatia, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Hungary.
  • Non-EU countries: Switzerland, Albania, Belarus, North Macedonia, Iceland, Bosnia and Herzegovina, Vatican City, Liechtenstein, Monaco, Norway, San Marino.
Delivery Timeliness ›
  • DE Warehouse: 5-7 business days
  • Hong Kong Warehouse: 7-10 business days
  • Refurbished Devices: 5-7 business days
  • Pre-sale Products: 5-7 business days after warehouse arrival
Repair Services ›

Provides free repair and after-sales services for products that are within the warranty period. For more details, please contact the customer service team.

Insurance Services ›

Minisforum provides two types of protection for sold products:

  • 1. Shipping Protection includes: Loss and damage in transit, Theft/Porch Piracy, Mis-delivery by courier, USD$5 compensation for delay Smooth Claims
  • 2. Product Protection Plan:Customers can choose a 1-year, 2-year, or 3-year insurance plan tailored to their needs. This plan covers accidental damage occurring during normal product use and extends the original manufacturer's warranty with identical coverage terms after its expiration. Different durations are subject to varying premium rates.

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Trusted Delivery

Free Shipping

Free Shipping

Free RMA Return

Free RMA Return

0% APR Plan

0% APR Plan

Up To 3 Years Extended Warranty

Up To 3 Years Extended Warranty

30-Day Money-Back Guarantee

30-Day Money-Back Guarantee
€149,00 €179,00 Save €30,00
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Purchase
Overview
Specs
FAQ
Reviews

More Built Into One Slot

Built for More Storage Scenarios

Workstation Storage Expansion

Workstation Storage Expansion

Add up to four NVMe SSDs through one PCIe slot for video projects, AI datasets, virtual machines, cache, and large working files. More high-speed storage. Less internal compromise.

Large Local Storage

Large Local Storage

Connect up to four SATA 3.0 HDDs through OCuLink for backups, archives, media libraries, and capacity-focused storage. NVMe for speed. SATA for scale.

High-Speed External Storage

High-Speed External Storage

USB-C delivers up to 20Gbps for external SSDs and other compatible high-speed devices. Fast data access, built right into the card.

Homelab & Server Builds

Homelab & Server Builds

Combine NVMe, SATA, and USB expansion in one PCIe slot for compact servers, storage nodes, and Homelab systems. Turn one PCIe slot into a flexible storage hub.

Two Ways to Build Your Storage
ESP4B dynamically distributes PCIe bandwidth according to the number of installed NVMe SSDs, giving you the choice between higher per-drive bandwidth and greater storage density.
High-Performance Mode
Full-Population Mode
High-Performance Mode
2 × NVMe SSDs
SSD1: Up to PCIe 4.0 ×4
SSD2: Up to PCIe 4.0 ×4
Best suited for high-speed working drives, project files, cache storage, and workloads that prioritize per-drive performance.
Full-Population Mode
4× NVMe SSDs
SSD1 / SSD2 / SSD3 / SSD4: PCIe 4.0 ×2 Designed for larger local storage pools, multi-drive organization, datasets, project archives, and workloads that benefit from additional SSD capacity.

Every Connection. One card.

11 × OCuLink
Supports up to four SATA 3.0 HDDs through the custom
OCuLink-to-4×SATA cable.
PCIe 3.0
Mode supported
SATA HDD
power cables are supplied separately by the user
21 × USB Type-C
USB 3.2
Up to 20Gbps
4 × onboard M.2 NVMe SSD
SSD1: Up to PCIe 4.0 ×4
SSD2: Up to PCIe 4.0 ×4
SSD3: Up to PCIe 4.0 ×2
SSD4: Up to PCIe 4.0 ×2
With four SSDs installed, all slots operate at PCIe 4.0 ×2.

PCIe 4.0 ×4
PCIe 4.0 ×4 host interface.
Supports PCIe 4.0 ×4 or higher host slots.

Package Contents

ESP4B-850

SATA Data cable

Long Retaining Strip

Installation Screw Set

User Manual

ESP4B specification

Model

ESP4B PCIe Expansion Card

Product Type

PCIe to 4 × NVMe M.2 Expansion Card

Onboard Chipset

AMD B650/B850

Platform Support

Intel / AMD platforms

Host Interface / Requirement

PCIe 4.0 x 4
(Requires a PCIe 4.0 x 4 or higher slot on the host system)

FAQ & Support

  • Q1: How long does it take to process and ship my order?

    A: Shipping times depend on whether your order is a pre-order or in-stock. Pre-orders will be processed and shipped based on the actual date the goods arrive at our warehouse.


    For in-stock orders, they are typically processed within 2–3 business days. We primarily ship via DHL, and a tracking number will be emailed to you once your package has left our warehouse.

  • Q2: Do I need to pay customs duties or taxes?

    A: If your shipping address is within the EU: No additional customs fees are required. Minisforum will handle all customs formalities in advance.


    If your shipping address is outside the EU: We recommend paying the €30 "Duty-Free Shipping" fee. By doing so, Minisforum will cover any customs duties or taxes incurred during transit.

  • Q1: Can I return the product if I simply change my mind?

    A: Yes, returns due to personal preference are accepted within 30 days, provided the device is unopened and in pristine condition. Please note that return shipping costs for non-defective items are the buyer's responsibility.

  • Q2: What is your return policy for this product?

    A: You may request a refund within 30 days of product delivery (the delivery date is determined by the tracking number record). Requests made after 30 days are eligible for repair or replacement services only.

  • Q1: What is the purpose of this expansion card?

    A: The ESP4B-850 PCIe Expansion Card is a PCIe expansion card that adds NVMe M.2 SSD expansion interfaces to compatible systems via the host motherboard's PCIe slot, providing additional data connectivity.

  • Q2: Which PCIe slot does the ESP4B-850 PCIe Expansion Card need to be installed in?

    A: The host system must provide a PCIe 4.0 x4 or higher slot to achieve full performance. The ESP4B-850 PCIe Expansion Card is backward compatible with PCIe 3.0 slots, but in this case, the operating bandwidth of all M.2 slots will be downgraded to PCIe 3.0.

  • Q3: What SSDs are supported by the M.2 interfaces on the ESP4B-850 PCIe Expansion Card?

    A: The ESP4B-850 PCIe Expansion Card is designed to connect compatible M.2 2280 NVMe SSDs. It is not a SATA M.2 adapter card; please confirm that your SSD uses the NVMe protocol and meets the size requirements before installation.

  • Q4: How is PCIe bandwidth allocated when multiple SSDs are installed on the ESP4B-850 PCIe Expansion Card?

    A: On the ESP4B-850 PCIe Expansion Card, SSD1/SSD2 operate at PCIe 4.0 x4 only when neither SSD3 nor SSD4 is installed. Once an SSD is installed in either the SSD3 or SSD4 slot (including scenarios where only 3 drives are installed), all slots are downgraded to PCIe 4.0 x2.

  • Q5: Which models can the ESP4B-850 PCIe Expansion Card be installed in?

    A: The models officially tested and completed by Minisforum include: MS-A2, MS-01, MS-01 SE, N5, N5 Pro, and MS-03. Theoretically, any MINISFORUM device equipped with a PCIe 4.0 x4 slot can support the ESP4B-850 PCIe Expansion Card. Since hardware configurations may vary across different models, it is recommended to verify the interface specifications of your specific model before purchasing or installing.

  • Q6: What functions are supported by the USB-C port on the ESP4B-850 PCIe Expansion Card?

    A: The USB-C port on the ESP4B-850 PCIe Expansion Card supports USB 3.2 Gen 2×2 data transfer at up to 20Gbps and can provide 5V/3A power output.

  • Q7: Does the ESP4B-850 PCIe Expansion Card support SATA hard drive expansion?

    A: The ESP4B-850 PCIe Expansion Card features one onboard OCuLink port and includes an OCuLink to 4×SATA 3.0 data cable in the package, allowing for the expansion of 4 SATA HDDs. SATA power cables must be supplied by the customer.

  • Q1: What kind of warranty is included with this product?

    A: All MINISFORUM new products come with a 24-month (2-year) standard warranty covering manufacturing defects. (Refurbished items carry a 1-year warranty).

  • Q2: How do I get technical support if I encounter an issue?

    A: We provide technical support. You can reach our dedicated support team via the "Contact Us" page or by emailing our official support address. We typically respond within 24-48 business hours.

  • Q3: Is the product covered by international warranty?

    A: Our warranty applies to products purchased through our official website or authorized resellers. For third-party purchases, please refer to the seller's policy.

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