Ugreen UG-70503 M.2 NVMe to PCI-E 3.0 × 4 Expansion Card
The UGREEN UG-70503 is a PCI Express expansion card that allows you to install an M.2 NVMe solid-state drive directly into your desktop computer’s PCIe slot. Also known as the CM302, this adapter bridges the gap between modern M.2 NVMe storage and traditional desktop motherboards. It delivers data transfer speeds of up to 32 Gbps through a PCIe 3.0 × 4 interface, making it a practical upgrade path for systems that lack a native M.2 slot.
PCIe 3.0 × 4 Interface With 32 Gbps Throughput
At its core, the UGREEN UG-70503 uses a PCIe Gen 3.0 × 4 lane configuration. This provides a theoretical maximum bandwidth of 32 Gbps. As a result, your NVMe SSD can operate at its full rated speed without bottlenecks from the adapter itself. In addition, the card is backward compatible with PCIe 2.0 and PCIe 1.0 motherboards, though transfer speeds will scale down accordingly.
The UG-70503 fits into PCIe × 4, × 8, and × 16 physical slots. This flexibility means you can install it in virtually any available full-length PCIe slot on your motherboard. Consequently, even older systems with limited expansion options can benefit from NVMe storage speeds.
Broad M.2 SSD Compatibility
The UGREEN UG-70503 supports M-Key M.2 NVMe and AHCI SSDs in four standard form factors: 2230, 2242, 2260, and 2280. It accommodates drives up to 4 TB in capacity. Furthermore, the adapter is compatible with widely used NVMe drives including:
- Samsung 950 Pro, 960 EVO, 970 EVO, 970 Pro, PM951, PM961, SM951, SM961
- Intel Optane SSD 800P, Intel SSD 760p, 660p, and 600p Series
- Toshiba OCZ RD400, Plextor M8PeG, M6e Series
- Kingston KC1000, HyperX Predator M.2
It is important to note that the UG-70503 only supports M-Key PCIe NVMe SSDs. It is not compatible with B-Key M.2 SATA or B-Key M.2 PCIe × 2 drives.
Multi-Layer PCBA Protection
Data integrity matters, especially on storage devices. The UGREEN UG-70503 features a multi-layer PCB design with four built-in protection circuits:
- Overcurrent protection – Prevents damage from excessive current draw
- Overvoltage protection – Guards against voltage spikes reaching the SSD
- Short circuit protection – Safeguards components in case of electrical faults
- EMI protection – Reduces electromagnetic interference for stable data transmission.
Technical Specifications
General Information
| Specification | Detail |
|---|---|
| Brand | UGREEN |
| Model Number | UG-70503 |
| Series Name | CM302 |
| Product Type | M.2 NVMe to PCIe Expansion Card |
| Warranty | 12 Months |
Interface & Performance
| Specification | Detail |
|---|---|
| Input Interface | M.2 M-Key |
| Output Interface | PCI-E 3.0 × 4 |
| Maximum Data Transfer Rate | Up to 32 Gbps (NVMe) / 6 Gbps (NGFF) |
| PCIe Generation | PCIe 3.0 (backward compatible with PCIe 2.0 and PCIe 1.0) |
| Protocol Support | NVMe, AHCI |
Compatibility
| Specification | Detail |
|---|---|
| Compatible PCIe Slots | PCIe × 4 / × 8 / × 16 |
| Supported SSD Form Factors | 2230, 2242, 2260, 2280 |
| Supported SSD Key Type | M-Key only |
| Maximum SSD Capacity | Up to 4 TB |
| Operating Systems | Windows (7, 8.x, 10, 11), Linux |
| S.M.A.R.T. Support | Yes |
| TRIM Support | Yes |
Protection Features
| Specification | Detail |
|---|---|
| Overcurrent Protection | Yes |
| Overvoltage Protection | Yes |
| Short Circuit Protection | Yes |
| EMI Protection | Yes |
| PCB Design | Multi-layer PCBA with porous heat dissipation |
Physical Dimensions
| Specification | Detail |
|---|---|
| PCB Dimensions | 116.8 × 47 mm |
| PCI-E Bracket Length | 119 mm |
| Overall Dimensions | 120 × 116.7 × 35.7 mm |
| Included Brackets | Full-height and low-profile |
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