WD_BLACK SN850X Review: Choose Capacity Before Game Mode

The WD_BLACK SN850X is a drive I would shortlist when I need more fast local storage, with capacity and physical fit ahead of Game Mode in the decision. It can be a sensible gaming-library purchase without treating every software setting as a reason to spend more. Compare it with a same-capacity alternative, including any cooling you need, before choosing a retailer.

My SN850X ownership lasted between one and two years. It did not disappoint me. The documented 2TB configuration is the reference for this review, while the independent measurements cited below establish the test conditions and results; my ownership account does not identify the capacity or provide a new benchmark session with my former drive.

The exact version matters

The reference drive is the bare 2TB WDS200T2X0E. Sandisk identifies the SN850X family as PCIe Gen4 with up to four lanes, M.2 2280 and TLC flash. Current capacity-specific ratings are below. Manufacturer datasheet.

Source: Sandisk specification table, checked October 4, 2026. These are rated ceilings, not sustained transfer guarantees.

I would not let the small difference between the headline read ratings decide a capacity purchase. If the larger drive solves a space problem and the smaller one does not, that is the more useful distinction. Start by listing what must remain installed. Then leave room in the budget for the rest of the upgrade, including backup storage if you need it.

Sandisk now lists an optional heatsink version at every capacity. Older review statements limiting the heatsink choice to smaller drives describe the lineup at that time. Current product page.

What the 2TB test tells us

Tom’s Hardware’s original 2TB testing found strong storage performance, with the SN850X improving on the preceding SN850 in its gaming-storage workload. Its sustained-write test also found a large fast cache and relatively consistent behavior afterward. Those results support treating it as a capable working drive, while remaining results from that particular sample and test setup. Original 2TB review.

That is enough for me to consider the SN850X alongside the Samsung 990 PRO. It is not enough to promise that changing drives will fix a particular game’s stutter or transform an editing workflow. First identify what is slow. When the existing drive has adequate room and the complaint is elsewhere in the system, I would keep the storage budget available for the part that needs attention. For a new game-library drive, the case is simpler. You are purchasing capacity anyway. Compare the exact SN850X offer against the alternatives in our SSD tier list, with the required space and installation constraints written down before opening the store pages.

Game Mode should earn its place

Sandisk describes Game Mode 2.0 as a feature of its Windows Dashboard software. The same product page describes drive-health monitoring through Dashboard. Manufacturer feature description.

In Tom’s Hardware’s 2TB test, the difference between Game Mode on and off was within the margin of error in 3DMark storage. Its application test did not show an advantage from forcing the setting on. The reviewer also noted that this was not a test of every intended future workload. Game Mode results and test limits.

I would start with the default configuration. A setting is worth keeping when it helps the task you care about.

To evaluate a mode change, keep the game, save point and background work consistent, then repeat the comparison. Its presence on the box should not carry the buying decision, and one older test should not be stretched into a claim that the setting can never help.

The capacity upgrade must physically fit

The bare 1TB and 2TB drives are listed at 2.38mm high; the bare 4TB and 8TB versions are 3.88mm. Sandisk also lists different heatsink dimensions for those capacity groups. Check the complete assembly against your host’s clearance. Dimension table.

This matters most when a buyer moves from a small drive to a much larger one in a confined machine. I would read the laptop or mini PC service documentation before ordering. A familiar M.2 length alone would not satisfy me. For a desktop with a motherboard M.2 cooler, I would check its instructions before buying a separate heatsink version or attempting to combine the two.

Cooling is also part of the sustained-workload decision. Tom’s Hardware reported that the drive’s temperature entered the throttling range during cache writes without a heatsink or additional airflow. That does not predict the temperature in your case. It does give me a reason to plan cooling for extended transfers. Test conditions and thermal observation.

For PS5, Sony requires effective heat dissipation and sets limits for the full assembly. Follow the console’s installation instructions and the SSD cooler’s directions. I would resolve those fit questions before considering appearance or RGB lighting.

Where I would spend the money

My preference is an SN850X sized for the library or projects I expect to keep, bought from a seller with clear terms. Check Amazon and Newegg for the same capacity and cooling configuration. A bare-drive price and a heatsink-drive price are not the same purchase. Neither is a new unit interchangeable with an open-box listing.

For an existing owner, I would first record health information using the manufacturer’s tools and our SSD health-check guide. Sandisk lists a five-year limited warranty, subject to its endurance limit and terms; that does not eliminate the need for a backup. Manufacturer specifications and warranty footnote.

The SN850X earns consideration through the storage it supplies and the evidence behind its performance. I would buy it when those match the machine and workload. I would keep a healthy 980 PRO or another suitable drive when the proposed change offers little beyond a different name in the system information screen.