This article covers Lexar 4TB NM790 SSD ヒートシンク付き PCIe Gen4 NVMe M.2 2280 内蔵ソリッドステートドライブ 最大7400.

Overview

The Lexar NM790 4TB SSD (model LNM790X004T-RN9NU) is a PCIe Gen4 x4 NVMe M.2 2280 internal solid state drive. It delivers sequential read speeds up to 7,400 MB/s and write speeds up to 6,500 MB/s, making it a strong contender in the high-capacity Gen4 SSD market. The drive comes with a pre-installed heatsink to manage thermal performance, and it’s officially compatible with the PlayStation 5 for expanded storage. By leveraging HMB 3.0 technology instead of onboard DRAM, the NM790 reduces power consumption by up to 40% compared to DRAM-based Gen4 SSDs while maintaining snappy performance. With a massive 4TB capacity, it’s designed for gamers and content creators who need ample space for large libraries and projects.

Compatibility Guide

The NM790 uses the M.2 2280 form factor and requires a PCIe Gen4 x4 interface on your motherboard or PS5 expansion slot. It is backward compatible with PCIe Gen3 slots, though speeds will be limited to roughly 3,500 MB/s. The included heatsink fits most desktop motherboards, but you should check clearance around the M.2 slot—some motherboard heatsinks may need to be removed. For PS5, the drive slides right into the expansion bay with the included heatsink; Sony has verified compatibility. In thin laptops, the heatsink’s thickness may be an issue, so verify physical clearance before purchase.

Product Info

Launched in September 2023, the Lexar NM790 4TB sits in the upper-mid range of the Gen4 SSD market. It achieves high throughput without a DRAM chip by relying on HMB 3.0 and Dynamic SLC caching. The drive boasts an endurance rating of 3,000 TBW, which translates to roughly 8.2 years of daily 1TB writes. Pricing hovers around ¥90,000 in Japan, offering excellent value per terabyte compared to DRAM-equipped rivals. Power consumption is low at around 6W maximum, making it suitable for laptops as well. Warranty is the shorter of 5 years or TBW limit (check official page for details).

Best Use Cases

Gamers needing bulk storage: Ideal for PS5 expansion or a high-capacity game drive on PC. 4TB means you can install dozens of AAA titles without worrying about space. Not for – those who only play a few games and can get by with a 1TB drive. Content creators: Perfect for storing large video projects, RAW photo libraries, and 3D assets. The fast sequential speeds help with editing timelines. Caution – heavy random-write workloads (database servers) may show lower performance than DRAM-based SSDs. Quiet, power-efficient builds: Low TDP and included heatsink allow passive cooling scenarios. Not ideal for – extreme budget builds where a Gen3 SSD would suffice, or ultra-thin laptops that can’t accommodate the heatsink. Value-conscious upgraders: If you want big capacity without paying a DRAM premium, this is a strong choice. Better options – if you need absolute peak random performance for professional workloads, consider Samsung 990 Pro or SN850X.

Things to Consider

The NM790’s DRAM-less design relies on HMB, which requires a modern OS (Windows 10+) and compatible NVMe driver to function optimally—older systems may not see full performance. While the heatsink helps thermal management, it increases physical thickness; double-check your motherboard’s M.2 clearance and ensure it won’t collide with the GPU or other components. After the SLC cache fills during sustained writes, raw write speeds drop noticeably—so if you frequently write multi-hundred-gigabyte files back-to-back, a DRAM-equipped alternative may be better. The 4TB capacity is overkill for most users; consider the 1TB or 2TB variants if you don’t need that much space. Finally, verify that your motherboard’s M.2 slot supports PCIe Gen4—otherwise you’re paying a premium for speed you won’t use. ## FAQ
Q: Does the NM790 work with PlayStation 5? A: Yes, it’s officially compatible. Install it in the PS5’s internal expansion slot with the included heatsink; the cover fits without issue. Ensure your PS5 is updated to the latest system software. Q: What is HMB 3.0 and why does it matter? A: Host Memory Buffer 3.0 allows the SSD to use a small portion of your system RAM as a cache, eliminating the need for dedicated DRAM on the drive. This reduces cost and power while keeping performance near DRAM levels. It’s automatically enabled on Windows 10/11 with the standard NVMe driver. * Q: Is 4TB too much for a typical user? A: For most desktop users, 1TB or 2TB is sufficient. But if you have a large game library, work with high-resolution media, or plan to keep the drive for years without upgrading, the 4TB model offers a compelling future-proof option. It also avoids the hassle of adding another drive later.

Product Disclosure (Amazon)

  • Manufacturer: Lexar
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B0CGKY9K2Y
  • Note: This article covers a manufacturer-made product based on Amazon listing details.