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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.

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.

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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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> 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)
Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - News Editor
I am a cell and molecular biologist and computers have been an integral part of my life ever since I laid my hands on my first PC which was based on an Intel Celeron 266 MHz processor, 16 MB RAM and a modest 2 GB hard disk. Since then, I’ve seen my passion for technology evolve with the times. From traditional floppy based storage and running DOS commands for every other task, to the connected cloud and shared social experiences we take for granted today, I consider myself fortunate to have witnessed a sea change in the technology landscape. I honestly feel that the best is yet to come, when things like AI and cloud computing mature further. When I am not out finding the next big cure for cancer, I read and write about a lot of technology related stuff or go about ripping and re-assembling PCs and laptops.