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The original was posted on /r/hardware by /u/Noble00_ on 2024-09-17 02:05:38+00:00.

A couple of weeks ago Geekerwan stated that cross latencies can be fixed. A recent beta AGESA 1.2.0.2 bios 2401 on Asus boards seemed to have resolved the issue. Going from around ~180 ns to ~75 ns.

If you remember, Chips&Cheese article and other outlets such as Ananadtech, everyone was scratching their heads on the regression on this topic, as previous Zen didn’t have such high latencies.

On the same forum the author of Y-Cruncher, Mystical/Alexander Yee stated:

That was faster than I thought. I guess I can say this now that it has happened. One of the lead architects told me that the latency regression was because they changed a bunch of tuning parameters for Zen5. It helped whatever workloads they were testing against, which is why they did it. But now that the reviews are out, they realized that the change looked really bad for synthetics. So they were going to roll it back. But they said “it would take a while” due to validation.

So latency sensitive nT workloads may see a benefit from this. Looking into more posts seems that it has improved performance a bit, but still rather early to tell.

All this said, hopefully this trickles down to Strix Point. Chips&Cheese measured strangely high latencies as well (while a hybrid core, 2 CCX layout, is monolithic). Also, from Geekerwan we know that it can affect gaming performance since scheduling isn’t the most reliable (still have yet to find more data on Strix core parking with gaming). So, if scheduling has ways to go to be fixed, at least lowering cross CCX latencies should help if games bleed over to Zen5c CCX.