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AMD Ryzen 9 3900X gaming benchmarks reveal turning off SMT narrows the performance gap with the Core i9-9900K only in select titles

AMD Ryzen 9 3900X (Source: Forbes)
AMD Ryzen 9 3900X (Source: Forbes)
Disabling SMT in the AMD Ryzen 9 3900X does have some benefits in improving average frame rates in a few titles bringing the processor much closer to the results posted by the Intel Core i9-9900K at stock settings, according to game benchmarks run by TechSpot. However, tests show that turning off SMT only offers gains within the 5% expected deviation and the 1% low scores, in fact, seem to favor enabling SMT.
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We know that AMD Ryzen offers excellent multi-core performance and even Windows 10 is now able to take good advantage of all the additional cores. While we are seeing many AAA titles today scale up to multiple cores, most games have been traditionally coded for single-threaded performance, which is where Intel continues to dominate. Apparently, disabling SMT on higher-core count Ryzens such as the 12C/24T Ryzen 9 3900X is not a good option although it can have some benefit for certain titles, according to game benchmarks run by TechSpot.

TechSpot decided to test 36 games to see if disabling SMT on the Ryzen 9 3900X helps in gaining additional fps. Disabling SMT did have a positive effect in improving the average fps some titles such as Prey, Just Cause 4, Hitman 2, and Shadow of the Tomb Raider while the performance gains were minimal in titles such as Project Cars 2, Apex Legends, For Honor, and PUBG

It is good to see that modern games are taking good advantage of SMT when we look at the performance gains in Assassin's Creed: Odyssey, Battlefield V, Forza Horizon 4, etc. When comparing 1% low scores, we get to see that enabling SMT actually benefits most titles with a 1% gain on average in most titles. 

It helps to note that the Ryzen 9 3900X does not beat the Core i9-9900K when SMT is disabled. In fact, SMT should not be disabled unless you are pretty sure that it will offer a significant fps boost in the particular game. If you know what you're doing, you can also use a tool like ProcessLasso to manually set core affinities for a particular game and see if it offers any fps benefit. 

The take home message from this test is that if you are planning to extract every possible frame at 1080p, Intel is still the best option available and disabling SMT on Intel could theoretically offer even better scores. That being said, AMD has closed the performance gap significantly in this generation and is an overall better option taking into account the process improvements and reduced power consumption.

Check out TechSpot's detailed analysis at the Source link below.

AMD Ryzen 3900X - Average FPS SMT on vs SMT off. (Source: TechSpot)
AMD Ryzen 3900X - Average FPS SMT on vs SMT off. (Source: TechSpot)
AMD Ryzen 3900X - 1% low FPS SMT on vs SMT off. (Source: TechSpot)
AMD Ryzen 3900X - 1% low FPS SMT on vs SMT off. (Source: TechSpot)

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Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - Managing Editor - 1358 articles published on Notebookcheck since 2012
Though a cell and molecular biologist by training, I have been drawn towards computers from a very young age ever since I got my first PC in 1998. My passion for technology grew quite exponentially with the times, and it has been an incredible experience from being a much solicited source for tech advice and troubleshooting among family and friends to joining Notebookcheck in 2017 as a professional tech journalist. Now, I am a Lead Editor at Notebookcheck covering news and reviews encompassing a wide gamut of the technology landscape for Indian and global audiences. When I am not hunting for the next big story or taking complex measurements for reviews, you can find me unwinding to a nice read, listening to some soulful music, or trying out a new game.
contact me via: @Geeky_Vaidy
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2019 08 > AMD Ryzen 9 3900X gaming benchmarks reveal turning off SMT narrows the performance gap with the Core i9-9900K only in select titles
Vaidyanathan Subramaniam, 2019-08- 9 (Update: 2019-08- 9)