WD Black SN850X Price History and Today's Lowest Price

What changed and why

The SN850X is Western Digital's Gen4 flagship and the 990 Pro's closest direct competitor, which makes the pair worth watching together: they tend to move in step, and when they do not, one of them is briefly the better buy. As published on 30 September 2026 the 4 TB model was reported at US$689 against a previously recorded low of US$200.

Our series begins at our first recorded reading. We do not import a price history from a tracker and present it as our own observation, and we do not estimate backwards. Where a published figure exists for an earlier date it is drawn as its own attributed layer, so you can always tell which numbers we observed and which we are quoting.

A price history page that appears fully formed on the day it launches has been reconstructed from somewhere. Reconstructions are where convenient numbers hide, because nobody can check them. The cost of our approach is that this chart is short at first; the benefit is that every point on it is a price that actually existed when we looked.

How to judge whether today is a good price

A single price tells you very little without a reference. Three are worth having. The first is the per-terabyte figure in the live table above, which lets you compare this drive against every other capacity and model we track rather than against its own past. The second is the published low, shown in the table below, which tells you how far the market has moved rather than how good a deal you are being offered today. The third is the shape of the segment: if every comparable drive sits in a narrow band, there is no deal to wait for.

What rarely helps is comparing against a price you remember. Memory anchors to the best figure you ever saw, which in this market was usually a promotional price from a different supply environment. Judging a 2026 purchase against a 2023 low guarantees disappointment and frequently produces a worse decision than simply buying what the machine needs.

Who it hits, and how hard

1 and 2 TB buyers are in the most competitive part of the market, where the SN850X trades places with the 990 Pro regularly. Check both on the day rather than assuming a winner.

4 TB buyers saw the largest increase on this model, as on most others. Compare against the 990 Pro and the broader 4 TB field.

8 TB buyers are in the thinnest part of the supply, where very few models exist and prices per terabyte are worst. Consider whether two 4 TB drives suit the machine better.

PS5 buyers should look for the heatsink variant, which WD sells specifically for that use and which saves fitting an aftermarket one.

What to do now

1. Compare the per-terabyte column in the live table rather than the sticker price when choosing a capacity.
2. Check the whole segment on our SSD price per TB page before settling on one model.
3. Convert endurance to a size-independent figure with the DWPD calculator.
4. Estimate real lifespan at your write rate with the lifespan calculator.
5. Read why SSD prices rose before concluding today's price is an anomaly.
6. Check the published forecasts before deciding to wait for a better price.

Outlook

We do not forecast. This page records a reading every six hours and publishes the series as it accumulates. The published forecasts for the wider NAND market are below, each with its date.

We publish no forecast of our own. Everything above is someone else's published position, with the date it was published and a link to it, because a price forecast from a site that sells against those prices is worth nothing to you.