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The Silicon Power UD90 is a PCIe Gen4 x4 M.2 2280 NVMe SSD rated up to 5,000 MB/s read and 4,800 MB/s write. It is a DRAM-less drive that uses Host Memory Buffer and an SLC cache to keep costs down while still delivering a real step up over SATA and Gen3 drives. It suits gamers, budget content creators and laptop or small-form-factor builders who want Gen4 speed without flagship pricing. It trails premium Gen4 drives on sustained writes and peak throughput, so heavy workstation use is better served elsewhere.
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Lowest price we've seen: $289.79 on Nov 14 at Newegg.com. Tracked across 6 stores since Nov 14.
Owners treat the UD90 as a solid value Gen4 drive that delivers a clear jump over SATA and older NVMe. The common caveats are the DRAM-less design and write speeds that drop during long transfers.
The Silicon Power UD90 is a 2TB internal M.2 2280 solid state drive. It connects over PCIe Gen4 x4 and supports NVMe 1.4. It is rated for sequential reads of up to 5,000 MB/s and sequential writes of up to 4,800 MB/s.
The drive has no dedicated DRAM cache chip. It uses Host Memory Buffer (HMB) technology instead, and SLC caching supports everyday read and write responsiveness. It is a mid-range Gen4 drive rather than a flagship-tier one, and its peak speeds are lower than those of the fastest Gen4 and Gen5 drives.
It is aimed at gaming, content creation, and system or boot drive upgrades from a SATA SSD or hard drive. It suits laptops and small form-factor PCs, where cooling is limited. It is a consumer-grade drive, not built for sustained heavy writes or 24/7 data center duty.
