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WD Black SN850X vs Samsung 990 Pro: Which one to choose?

In 2022, there were numerous new releases in the Gen 4 NVMe market. But, two of the most discussed ones are WD Black SN850X and Samsung 990 Pro. So, which one should you go for in 2023?

WD Black SN850X is called the updated version of the older SN850. However, the 990 Pro is the successor to the 980 Pro.

Both of these are equipped with the TLC NAND Flash.

There are various other similarities but some differences between the both. So, if you are confused and want to choose one of these, I am here to help you. Let’s start our comparison right away.

SpecificationWD Black SN850XSamsung 990 Pro
Storage Variants1TB, 2TB, 4TB1TB, 2TB, 4TB
Theoretical Read Speed (Seq)Up to 7,300 MB/sUp to 7,450 MB/s
Theoretical Write Speed (Seq)Up to 6,300 MB/sUp to 6,900 MB/s
Random Read SpeedUp to 1,200K IOPSUp to 1,400K IOPS
Random Write SpeedUp to 1,100K IOPSUp to 1,550K IOPS
Warranty5 Years5 Years
Heatsink OptionAvailableAvailable
EncryptionNot AvailableAvailable
PriceCheck AmazonCheck Amazon

The theoretical sequential read speed of the Samsung 990 Pro is up to 7,450 MB/s, which is 150 MB/s faster than the WD Black SN850X’s sequential read speed of up to 7,300 MB/s. Similarly, the Samsung 990 Pro’s theoretical sequential write speed is up to 6,900 MB/s, which is 600 MB/s faster than the WD Black SN850X’s sequential write speed of up to 6,300 MB/s.

The Samsung 990 Pro has 200K IOPS higher random speed i.e. 1,400K IOPS, while the WD Black SN850X has a random read speed of up to 1,200K IOPS. In terms of random write speed, the Samsung 990 Pro has a speed of up to 1,550K IOPS, which is 450K IOPS faster than the WD Black SN850X’s speed of up to 1,100K IOPS.

The main drawback of the SN850X is that it comes with no SSD Data encryption.

The Test-Bench Specifications are:

CPU: Intel Core i5 12600K

RAM: DDR5 4800 MHz (8x2GB)

Motherboard: MSI Pro Z690-A

OS: Windows 11 Pro

All the tests are done on the 2TB variants of both drives. They are 0% filled during the benchmark tests.

Sequential read/write speed bar graph (990 Pro vs SN850X)

There is a very minimal difference in the sequential read/write performance of both these drives. However, the Samsung 990 Pro is winning the game by small numbers.

Random read/write speed bar graph (990 Pro vs SN850X)

Again, the Samsung 990 Pro is winning the game in random read performance. But, the random write performance is better with the KC3000.

This test specifically tests the drives for their performance in-game loading, game saving, and overall gaming performance.

3DMark Gamers test scores bar graph comparison

Both the SSDs come with dedicated game modes which don’t seem to have any major impact on the gaming performance at all. However, the overall performance is almost similar with both SSDs.

In the PCMark 10 Full System Drive benchmark, the software writes 204 GB data over a period of time. This test covers different types of tasks including Adobe applications, MS Office, File Transfer, etc. Also, the startup time of some games including Battlefield V, Overwatch, and Battlefield are calculated.

PCMark 10 Full Drive Benchmark
Anvil Score Comparison Bar Graph (990 Pro vs SN850X)
AS SSD Benchmark Scores Comparison

The results are clear. Samsung 990 Pro is the winner in terms of gaming, productivity, sequential read/write, and random read/write performance. In other words, it will be capable of offering you a better performance in the real-world than the SN850X.

But, keep in mind that the SN850X is also a pretty powerful SSD than other competitors. So, you should not take it off your list. Its cheaper price can make a big difference for some buyers.

ParameterWD Black SN850XSamsung 990 Pro
2TB: 1,200 TBW
4TB: 2,400 TBW
1TB: 600 TBW
2TB: 1,200 TBW
Warranty5-Years Limited Warranty5-Years Limited Warranty
MTBF (Mean Time Between Failure)1.80 Million Hours1.50 Million Hours

There are no differences in both when it comes to endurance (TBW). But, the MTBF is higher in the SN850X. So, theoretically, it can last longer than the 990 Pro.

Technical SpecificationWD Black SN850XSamsung 990 Pro
NAND Flash TypeSandisk’s TLCSamsung’s TLC
NAND Flash Layers112176
ControllerWD ProprietarySamsung Pablo Controller
Controller ConfigurationsTri-Core, 4-ChannelsNot Specified
Heatsink OptionAvailableAvailable
EncryptionNot AvailableAvailable

By the time I am writing this article, the Samsung 990 Pro is around 30$ more expensive than the SN850X. So, if you want to save some money on this purchase without compromising a lot on the performance, I would recommend going for the SN850X.

On the other hand, if you are looking for the best performance possible, Samsung 990 Pro is made for you. It also has the feature of encryption with a better controller. The write cache is better with the 990 Pro. So, clearly, Samsung 990 Pro is the winner of this game.

Let me know your thoughts in the comments!

Kingston KC30007000/7000 MB/s
256-bit Encryption
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Seagate Firecuda 5307300/6900 MB/s
256-bit Encryption
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