Nintendo Maniac 64 Registered User



Join Date: Nov 2009 Location: Northeast Ohio Posts: 444

Quote: benwaggoner Originally Posted by I note that the top Intel processor used has only half the cores as the top AMD, so this difference could easily be due to multithreading more than per-core performance improvements. need to use Linux to get any semblance of good performance at all (Wendell from level1techs did a good analysis on the subject in



You can also see from the results that even normal Threadripper like the 12core 2920X (which still uses a somewhat nonstandard die configuration) is getting beaten by the 9900K and 3700X which both use a very traditional CPU core configuration by comparison (one could even argue that the separate I/O die on the 3700X is actually more traditional and is akin to the days of northbridges and external memory controllers ala Athlon XP and Core 2 Duo).





Nevertheless, there could very well be a point of diminishing returns in terms of multicore scalabilty for SVT-AV1 that 32c/64t just isn't seeing the utilization that it could otherwise, and even more-so with such the nontraditional core arrangement of the 2990WX.





Quote: benwaggoner Originally Posted by Also, I note that the Intel processor used in comparison is from 2017.



Quote: benwaggoner Originally Posted by The current equivalent would probably be the i9-9980XE, which as two more cores and 7% faster clock.



This tells me that Phoronix wasn't actually trying to use the highest-end Intel CPU parts that are available, even within a given CPU generation. Keep in mind that the 2990WX uses a very nontraditional CPU die topology that makes it more akin to something like a dual-socket system with two full CPUs. It's so nontraditional that you basicallyto use Linux to get any semblance of good performance at all (Wendell from level1techs did a good analysis on the subject in this video here ).You can also see from the results that even normal Threadripper like the 12core 2920X (which still uses a somewhat nonstandard die configuration) is getting beaten by the 9900K and 3700X which both use a very traditional CPU core configuration by comparison (one could even argue that the separate I/O die on the 3700X is actuallytraditional and is akin to the days of northbridges and external memory controllers ala Athlon XP and Core 2 Duo).Nevertheless, there could very well be a point of diminishing returns in terms of multicore scalabilty for SVT-AV1 that 32c/64t just isn't seeing the utilization that it could otherwise, and even more-so with such the nontraditional core arrangement of the 2990WX.While true, keep in mind that the per-GHz performance on Intel has not changed at all and won't change until their 10nm parts.The i9-7960X was not the flagship part of its generation - there was in fact an 18core 7980XE during that gen as well (albeit with a bit lower base clock).This tells me that Phoronix wasn't actually trying to use the highest-end Intel CPU parts that are available, even within a given CPU generation.

____ HTPC ____ | __ Desktop PC __

2.93GHz Xeon x3470 (4c/8t Nehalem) | 4.6GHz Pentium G3258 (2c/2t Haswell)

Radeon HD5870 | Intel iGPU

2x2GB+2x1GB DDR3-1333 | 4x4GB DDR3-1600

Win7 x64 __________________