Which is better for gaming?

Both load games far faster than SATA or hard drives. The Bestoss has higher sequential numbers, but in-game load times differ little between the two. The UD90's cooler running and longer warranty make it the safer pick for a laptop or tight case.

The Bestoss publishes a 2,048 TBW endurance rating at 4 TB and carries a 3-year warranty. Silicon Power does not publish a TBW figure for the UD90 but backs it for 5 years. On warranty, the UD90 wins; on stated endurance, the Bestoss does.

Is the Bestoss worth stepping up to?

Only if you want the highest sequential speeds, the published endurance rating, or PS5 compatibility. For everyday gaming and file work the UD90 is close enough, and it has the longer warranty.

Does either work in a PS5?

Bestoss states PS5 compatibility for the GM988. Silicon Power does not state it for the UD90, so check the heatsink and fit requirements before installing one.

Do these drives have DRAM?

No. Both are DRAM-less and rely on Host Memory Buffer plus SLC caching. That is fine for games and general use, but sustained heavy writes will slow more than on a DRAM-equipped drive.

Will either fit a laptop?

Both are M.2 2280, the common laptop size. The UD90 runs cooler, which matters more in a thin laptop than in a desktop.

Silicon Power UD90 4TB NVMe SSD vs Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

The Bestoss GM988 is the faster drive on paper, with sequential reads up to 7350 MB/s and writes around 6300-6600 MB/s, versus roughly 5000/4800 MB/s for the Silicon Power UD90. The UD90 backs its drive with a 5-year warranty; Bestoss offers 3 years. Both are DRAM-less designs using HMB and SLC caching, so neither is a workstation-grade drive. Buy the UD90 for a cooler-running, longer-warranty drive in a laptop or small form factor build; buy the Bestoss if you want the highest sequential numbers and PS5 compatibility.

Choose the Silicon Power UD90 if you want a cooler-running Gen4 drive with a 5-year warranty for a laptop, SFF PC, or a general gaming and editing upgrade.
Choose the Bestoss GM988 if peak sequential speed and PS5 compatibility matter more to you than warranty length.

Prices

Silicon Power UD90 4TB NVMe SSD: $169.79 at Newegg.com (checked today)
Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4: $114.99 at Bestoss (checked today)
Difference: the Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4 is $54.80 cheaper than the Silicon Power UD90 4TB NVMe SSD today

	Silicon Power UD90 4TB NVMe SSD	Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4
Sequential read	Up to 5,000 MB/s	Up to 7,350 MB/s
Sequential write	Up to 4,800 MB/s	6,300-6,600 MB/s
Warranty	5 years	3 years
Endurance rating (TBW at 4TB)	Not published by the maker	2,048 TBW
Caching design	DRAM-less with HMB and SLC cache	DRAM-less with HMB and dynamic SLC cache
Cooling	Low-power design that runs cooler than flagship Gen4/Gen5 drives	Graphene copper heat spreader
PS5 compatibility	Not stated	Stated compatible
Capacity range	250 GB to 4 TB	512 GB to 4 TB

Spec	Silicon Power UD90 4TB NVMe SSD	Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4
Connection	M.2	M.2
Color	Black, Blue, White, Red	Yellow
NVMe	Yes	Yes
Capacity	250 GB, 500 GB, 1 TB, 2 TB, 4 TB	4TB-GM988
Type	Internal	—
Form Factor	M.2 2280	—
Size (GB)	4000	—
Interface	PCIe Gen4 x4 NVMe	—

Silicon Power UD90 4TB NVMe SSD vs Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

Prices

Silicon Power UD90 4TB NVMe SSD vs Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

Prices

Silicon Power UD90 4TB NVMe SSD

Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

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Silicon Power UD90 4TB NVMe SSD

Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

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Silicon Power UD90 4TB NVMe SSD

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Silicon Power UD90 4TB NVMe SSD

Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

What separates them

Price history

Prices at every store

Silicon Power UD90 4TB NVMe SSD

Bestoss M.2 2280 NVMe SSD 4TB Internal PCIe Gen4

Specs compared

What reviewers say

Silicon Power UD90 4TB NVMe SSD

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