Skip to product information
MINISFORUM US
MINISFORUM ESP4B PCIe to 4 × NVMe M.2 Expansion Card
Sale price
$135.90
Regular price
$169.00
- Intel & AMD Compatible
- PCIe 4.0 ×4 Host Interface
- 4× M.2 NVMe SSD Slots
- 1× OCuLink & USB 3.2 Gen 2×2
- ASPM Support
Payment Methods:
Trusted Delivery:
Built for More Storage Scenarios
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.
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
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
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.
① 1 × OCuLink
Supports up to four SATA 3.0 HDDs through the custom OCuLink-to-4×SATA cable.
PCIe 3.0
Mode supportedSATA HDD
power cables are supplied separately by the user② 1 × 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.
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.
Packing List
PCIe Card
SATA Data cable
Long Retaining Strip
Installation Screw Set
User Manual
ESP4B Specification
Product Name
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
M.2 Interface
4 x M.2 NVMe SSD slots
Operating Modes
High-performance mode: SSD1 / SSD2 support PCIe 4.0 x 4 when SSD3/ SSD4 are unpopulated;
full-population mode: all four M.2 SSDs operate at PCle 4.0 x 2
Max Link Width per Slot
SSD1: up to PCIe 4.0 x 4
SSD2: up to PCIe 4.0 x 4
SSD3: up to PCIe 4.0 x 2
SSD4: up to PCle 4.0 x 2
OCuLink / SATA Expansion
1 × OCuLink port, supports 4 × SATA 3.0 HDDs via included custom OCuLink-to-4 × SATA data cable;
SATA HDD power cable is customer-supplied. Switchable to PCIe 3.0 mode.
USB Type-C Port
1 x USB Type-C, USB 3.2, up to 20 Gbps. 5V / 3A
Power Management
Supports ASPM
Application
NVMe SSD storage expansion / external SATA HDD expansion