Ryzen 9000 launched with unexpectedly high cross-CCD latency on the dual-CCD models — Ryzen 9 9900X and Ryzen 9 9950X. However, AMD has now rectified the issue with a new AGESA microcode update that cuts the Ryzen 9 9900X and Ryzen 9 9950X's cross-CCD latency in half. User domdtxdissar on the Overclock forums discovered that AGESA microcode update 1.2.0.2 improves performance and cross-CCD latency from 180 ns to 75 ns.
The new microcode update lowers Ryzen 9000's cross-CCD latency to almost identical latencies as the previous generation Ryzen 9 7950X and Ryzen 9 7900X. It is unknown how precisely this change will improve performance, but the Overclock forum user reported that it does improve performance in some form. Inevitably, this change will enhance the performance of latency-sensitive applications that take advantage of multiple CPU cores on Ryzen 9000 chips with a dual-CCD configuration.
