This article covers SAMSUNG 512GB M.2 2242 42mm PM991 NVMe PCIe Gen 4 x4 TLC SSD (MZALQ512HALU) Dell HP Lenovo ノートパソコン ウルトラブックタブレット用.
Overview
The Samsung PM991 series is an OEM internal SSD designed for laptops and tablets, offering a compact M.2 2242 (22mm x 42mm) form factor. The MZALQ512HALU model provides 512GB of storage capacity and utilizes the NVMe PCIe Gen 4 x4 interface, delivering sequential read speeds up to 3,100MB/s and write speeds up to 2,000MB/s. This SSD is widely adopted by major laptop brands such as Dell, HP, and Lenovo, making it an excellent choice for upgrading ultrabooks and tablets with an M.2 2242 slot. It also maintains backward compatibility with PCIe Gen 3 x4, ensuring stable performance across a wide range of systems. Positioned in the entry to mid-range market segment, this drive is well-suited for everyday office work, web browsing, and light creative tasks, offering a significant performance boost over traditional SATA SSDs or eMMC storage.
Compatibility Guide
This SSD uses the M.2 2242 (22mm x 42mm) form factor and features an M-key connector. It is compatible with any system that has an M.2 slot supporting NVMe PCIe Gen 4 x4 or Gen 3 x4. Supported sockets: M.2 slot (M-key) Supported form factors: M.2 2242 (22mm x 42mm) * Interface: NVMe PCIe Gen 4 x4 (backward compatible with Gen 3 x4) Important compatibility notes: Older Lenovo ThinkPad P-series models (P50, P51, P52) only support 2242 M.2 SATA SSDs and are not compatible with this NVMe drive. Additionally, ThinkPad P50s, P51s, P52s, P40s, P41s, and P42s series are also not supported. Always verify that your laptop's M.2 slot supports NVMe PCIe before purchasing.
Product Info
The Samsung PM991 (MZALQ512HALU) is an OEM SSD featuring 512GB of TLC (Triple-Level Cell) NAND flash memory. It uses Samsung's proprietary controller and employs an HMB (Host Memory Buffer) design instead of a dedicated DRAM cache, which keeps costs down while maintaining adequate performance for typical workloads. Capacity: 512GB Form factor: M.2 2242 (22mm x 42mm x 2.38mm) Interface: NVMe PCIe Gen 4 x4 Sequential read: up to 3,100MB/s Sequential write: up to 2,000MB/s Random read: up to 380,000 IOPS * Random write: up to 330,000 IOPS As an OEM product, it is typically sold in bulk packaging without retail accessories. The drive is positioned in the entry to mid-range tier, making it an ideal choice for upgrading compact laptops where space is at a premium.
Best Use Cases
Laptop storage upgrades: Ideal for users with ultrabooks or tablets that have an M.2 2242 slot. Replacing a slow SATA SSD or eMMC storage with this NVMe drive will dramatically improve boot times and application loading speeds. Secondary PC or budget build: Can be used in desktop PCs with an M.2 2242 slot as an OS drive, providing a noticeable system responsiveness boost without a large investment. * Cost-conscious users: As an OEM product, it is often available at a lower price point than retail equivalents, making it a great value option for those who want NVMe performance on a budget.
Things to Consider
This is a bulk/OEM product, meaning it comes without retail packaging, manuals, or mounting screws. You will need to source the necessary hardware separately. The M.2 2242 form factor is less common than the standard M.2 2280, so compatibility is limited to devices that specifically support this size. Always check your laptop or motherboard specifications before purchasing. Since this drive uses HMB technology instead of a dedicated DRAM cache, sustained write performance for very large file transfers may be lower compared to DRAM-equipped SSDs. For everyday tasks like web browsing, office work, and light media consumption, this is not a concern. However, if you frequently work with large video files or perform heavy data transfers, a DRAM-based SSD might be a better fit.
Product Disclosure (Amazon)
- Manufacturer: サムスン(SAMSUNG)
- Seller: ジェネロシティー
- Fulfilled by: ジェネロシティー
- ASIN: B0BPF4KM68
- Note: This article covers a manufacturer-made product based on Amazon listing details.