It is because of this that SMT is not used with Ryzen processors, while the corresponding Hyperthreading technology is used together with Intel processors.Īccording to tests at PC Games Hardware the problem has no major impact on AMD’s processors with eight or more cores, as these simply have enough cores and available threads for the game to perform well. When newer processors based on Zen and later derivatives are identified with the designation “AuthenticAMD”, without the suffix “family = 0x15”, the number of logical processors / threads is limited to the number of cores of the processor.
#OLD BULLDOZER GAME COMPUTER CODE#
When the code finds the processor’s ID loop “AuthenticAMD” and “family = 0x15” (Bulldozer and later derivatives), it is activated that all “Logical processors” (threads) are to be used. For Cyberpunk 2077, AMD GPUOpen code is used, which was originally intended to allow applications to use all cores / threads with Bulldozer. Regardless of technology, both SMT and CMT require special hand-laying in schedulers to use the correct number of wires and cores.Īfter a post by the Reddit user CookiePLMonster and dig in the code of Techpowerup it appears that old code is behind the problems with Ryzen. All had two cores in a cluster, where it is often debated whether it was one or two cores that shared resources – something AMD called Clustered Multithreading (CMT). The technology allows a kernel to execute code in two threads instead of one, which means that unused capacity is used, often with great performance benefits.īefore Zen, all AMD processors were based on Bulldozer and subsequent iterations. The SMT technology was introduced by AMD with the architecture Zen in 2017, but has previously been used by Intel for a long time under the marketing name Hyperthreading. As part of this, it now appears that the game does not benefit from Simultaneous Multithreading (SMT) in AMD Ryzen processors, which results in poorer performance with models with fewer cores. In addition to praise from reviewers and criticism for bugs, the game has attracted attention as it, by today’s standards, requires a lot of hardware. This week, one of the last decades’ most anticipated games was released – Cyberpunk 2077.
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