Lexar NM620 512GB

The Lexar NM620 512GB utilizes the Innogrit IG5216 "RainierQX" controller, a 4-channel architecture designed to maximize throughput on the PCIe 3.0 interface without the cost or footprint of onboard DRAM. Instead of a dedicated cache chip, the drive relies on Host Memory Buffer (HMB) technology and is paired with 3D TLC NAND flash. The NM620 emphasizes burst performance by leveraging a robust pseudo-SLC cache; once that cache is exhausted during sustained large-file transfers, write speeds fall to the native TLC NAND speed. The single-sided M.2 2280 PCB ensures compatibility with thin laptops, and the Innogrit controller can run warmer than comparable Phison-based drives, though it rarely reaches thermal throttling points in ventilated chassis.

Key Specifications

• Interface: PCIe Gen 3.0 x4 / NVMe 1.4
• Controller: Innogrit IG5216 (DRAM-less)
• NAND Type: 3D TLC
• Sequential Read: Up to 3500 MB/s
• Sequential Write: Up to 2400 MB/s
• Endurance: 250 TBW
• Form Factor: M.2 2280 (Single-sided PCB)
• DRAM Cache: None (HMB Supported)

Hardware Alternatives

• Samsung 980 (Non-Pro): The primary architectural rival; both drives utilize HMB rather than DRAM and target the 3500 MB/s read cap of the PCIe 3.0 interface.
• WD Blue SN570: Operates in the same performance tier using proprietary SanDisk/WD silicon, offering similar sequential throughput and competing on sustained write consistency.
• ADATA XPG SX8200 Pro (Later Revisions): Later manufacturing revisions have been spotted with Innogrit controllers similar to the one in the NM620, exhibiting comparable behavior characteristics.