AMDZEN processors have always had some sort of latency-related issues due to issues with the original design, often resulting in higher communication latency between these modules due to the AMD InfinityFabric interconnect, CCX (CPU Complex) or CCD (Core Compute Chip).
This is why AMD recommends that users use ZEN processors with faster and lower-latency memory to obtain the best system performance. However, this is not enough, and the essential problem has not been solved.
When testing the 9950X, members of the hardware testing website AnandTech Forum found that the new ZEN5 latency was very high, with an average latency of 180 nanoseconds, which is more than twice the latency of ZEN4, especially the latency between CCDs.
For comparison, the latency of AMDRYZEN99950X from one core on a CCD to another is 180 nanoseconds, while the latency of AMDRYZEN97750X is only 76 nanoseconds.
However, this problem has been solved in the latest BIOS firmware. The latest AGESA1.2.0.2 version launched by AMD has been significantly optimized. The delay on AMDRYZEN9950X is about 75 nanoseconds, which is significantly shorter than the previous delay time.
Y-cruncher developers said in the discussion that AMD has obviously realized the performance degradation caused by delays, so the new firmware is the result of AMD's conscious efforts.
1.2.0.1
1.2.0.2
But the question is why is the latency so low in ZEN4 and so high in ZEN5? This is actually a mistake, that is, in ZEN5 AMD made a series of parameter adjustments that would help improve performance for most workloads, but they also realized that this change was bad for a CPU complex like AMD, so they withdrew these adjustments.
Finally, let’s talk about the performance issues of AMDCPU. If you are using Windows 11 system, then Microsoft must also bear part of the responsibility.
Note: OEMs are expected to launch AGESA version 1.2.0.2 firmware adapted for their own brand motherboards later this month. Users using AMD9000 series processors can download the update at that time.