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 Gameguru Mania News - Dec,14 2020 -  
Cyberpunk 2077 Does Not Leverage SMT on AMD Ryzen - tech
(d@rkfu) 11:05 AM CET - Dec,14 2020 - Post a comment / read (7)
Cyberpunk 2077 does not leverage simultaneous multi-threading (SMT) on AMD Ryzen processors, according to multiple technical reviews of the game that tested it with various processors. The game does leverage the analogous HyperThreading feature on rival Intel Core processors. While this doesn't adversely affect performance of higher core-count Ryzen chips, such as the 16-core Ryzen 9 5950X or to a lesser extent the 12-core 5900X, lower core-count variants such as the 6-core 5600X take a definite performance hit, with PCGH reporting that a Ryzen 5 5600X is now matched by a Core i5-10400F, as the game is able to take advantage of HyperThreading and deal with 12 logical processors on the Intel chip, while ignoring SMT on the AMD one. CD Projekt RED may have bigger problems on its hands than performance optimization for a PC processor, such as the game being riddled with glaring performance issues on consoles; but in the meantime, the PC enthusiast community swung to action with a fix. Authored by chaosxk on Reddit, it involves manually editing the executable binaries of the game using a Hex Editor, which tricks the game into using logical processors as cores. This fix has been found to improve frame-rates on AMD Ryzen machines. Before attempting the hex edit, make sure you back up your original executables. The screenshot below provides a before & after-patch view of Cyberpunk 2077 loading a Ryzen 9 5950X. You can learn more about this fix, and a step-by-step guide here.

Another Reddit post by CookiePLMonster sheds light on what is possibly happening with the game. According to them, Cyberpunk 2077 reuses AMD GPUOpen pseudo-code to optimize its scheduler for the processor. It was originally designed to let an application use more threads when an AMD "Bulldozer" processor is used; but has the opposite effect when a non-Bulldozer AMD processor is detected. The game looks for "AuthenticAMD" processor brand, and "family = 0x15" (AMD K15 or Bulldozer/derivative), and only then engages "logical processors" (as identified by Windows OS scheduler as part of its Bulldozer-optimization). When any other, including a newer AMD processor is detected, the code makes the game scheduler only send traffic to the physical cores, and not to their logical processors. The game indeed uses this archaic GPUOpen code from 2017 to identify AMD processors, and this is responsible for its sub-optimal performance with AMD Ryzen processors. This clearly looks like a bug or oversight, not like it's intentional.
last 10 comments:
SABOT's(02:03 PM CET - Dec,14 2020 )
quote:
This clearly looks like a bug or oversight, not like it's intentional.


Probably nothing to with the fact the game is eons in the making! :lol:

lorcro2000(04:46 PM CET - Dec,14 2020 )
Intel has been so dominant for so long that you can still see stuff like this, where AMD chips just don't work as well because game devs fuck up. It's a fixable problem but still.

devilhood(06:35 PM CET - Dec,14 2020 )
https://github.com/yamashi/PerformanceOverhaulCyberpunk

quote:
smt: This fixes a bug with AMD CPUs causing the game to use only half the CPU. (default: true)


/r/PCGaming has an active thread discussing these improvements and further discoveries.

You'll likely see some of the improvements in the mod DLL added to the official game with the new patch, so make sure you keep an eye on that page for updates.

Csimbi(07:53 PM CET - Dec,14 2020 )
Game is pretty much unplayable - AMD or not.
Biggest disappointment of the year edition.
They should stick to Witcher, maybe they can get that right.

SABOT's(12:09 PM CET - Dec,15 2020 )
Csimbi> Game is pretty much unplayable - AMD or not.
Biggest disappointment of the year edition.
They should stick to Witcher, maybe they can get that right.


Absolutely. To the point that refunds are being given as they apologise unreservedly for their POS. Saying, ‘they should have paid more attention’
https://www.theguardian.com/games/2020/dec/14/cyberpunk-2077-developers-offer-refunds-after-bug-ridden-launch

quote:
We would like to start by apologising to you for not showing the game on base last-gen consoles,” the company’s executive team wrote in the open letter. “We should have paid more attention to making it play better on PlayStation 4 and Xbox One.

El_Coyote(05:32 PM CET - Dec,15 2020 )
I'm not really having any issues with the game other than slowdowns in 3 car chases so far.
I've seen some cosmetic glitches and physics bugs, but for a big launch i've definately seen much worse. (Diablo 3 anyone?)

devilhood(12:29 AM CET - Dec,16 2020 )
Game plays totally fine on both my wife's machine and mine too, especially with the optimisations. Neither of us are AMD users though.

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