Some users have observed significant latency between cores in the Ryzen 9000 series processors with dual-CCD. Before the release of AGESA 1.2.0.1, cross-CCD core-to-core latency was measured at approximately 200ns, marking a substantial increase compared to the previous generation of Ryzen CPUs. However, the new AGESA firmware update reduces latency to double-digit figures.

Core-to-core latency results are interesting in some reviews of the Ryzen 9000 series processors using a BIOS with AGESA 1.2.0.1. When going from one core to another within the same CCD, latency rarely exceeds 25ns. However, when moving from one core to another in a different CCD, latency shoots up 200ns.

Previously, Geekerwan stated that AMD would fix this in an upcoming firmware, but it wasn't clear when that would happen. As it seems, it's already here. Some motherboard manufacturers have already launched a beta BIOS with AGESA 1.2.0.2 firmware for their 600-series motherboards. Despite its unofficial status, enthusiasts who flashed this firmware have reported a notable improvement in core-to-core latency on the Overclock.net forum (via HXL).

Data from “domdtxdissar” using the CapFrameX core-to-core latency tool indicates a reduction to 75 ns at peak. This data was gathered using the Ryzen 9 9950X and the Asus ROG Crosshair X670E Gene motherboard. However, it's important to note that results may vary across different Ryzen SKUs and motherboards. For example, HardwareLuxx also tested the beta BIOS with the AGESA 1.2.0.2 firmware, reporting a decrease in core latencies from 200 to 95ns.

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KitGuru says: Do you expect any noticeable performance gains from this fix? 

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