Overall, the performance gains and losses across the full gamut of our tests amounted to a wash. We did find that one title, Project Cars 3, is 7.5% faster after the patch, while Shadow of the Tomb Raider is 6.7% slower. The bug impacts chips with more than eight cores the most, so we used the 12-core Ryzen 9 5900X that dominates our CPU Benchmark hierarchy to test the patches. We've since followed up with patch testing and found that most of the games on the fully-patched system are within 2% of pre-patch performance. Notably, we tested with the first Windows 11 update that actually made the bug worse. However, we didn't see such severe impacts in our gaming tests, with our biggest Windows 10 vs 11 differences weighing in at 7% in one game title, while others are far more muted. As you'll see in our extensive CPU Benchmarks below, we found that AMD's 元 latency could be as much as six times higher in Windows 11 compared to Windows 10, and that 元 bandwidth was up to 12X higher in Windows 10.
The original issue appeared to be quite severe, at least in synthetic benchmarks. AMD's original announcement that it and Microsoft were jointly investigating two performance-sapping bugs in Windows 11 was an eye-opener, especially since they impacted all Windows 11-compatible AMD processors, which AMD said reduced gaming performance by up to 15% in some eSports titles and 3-5% in desktop PC applications.
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