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As always for CPU testing, we used an Nvidia GeForce RTX 3090 to minimize the graphics bottleneck.
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We tested with Windows 0.258 and the Windows 11-compatible Nvidia 472.12 graphics driver (the latest driver arrived after testing was complete).
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Windows 10 vs Windows 11 Gaming Performance Benchmarks
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We recently put those issues to the test.)ĪMD and Microsoft jointly investigated the issue, and a software update to fix the CPPC2 issue and a Windows Update to remediate 元 latency problems were delivered last week ( full details here). (Notably, these issues are separate from the performance issues surrounding Microsoft's recommended VBS and HVCI security settings that have caused an outcry. AMD says this bug is more detectable in chips with more than eight cores and >65W TDP. It's surprising that two severe bugs squeezed past both AMD and Microsoft's QA teams - the first reports of the 元 bug popped up in forums several months ago as enthusiasts tested the pre-release Windows 11 builds. AMD also reported that its UEFI CPPC2 (Collaborative Power and Performance Control 2) feature, a technology that helps to steer lightly-threaded work to the fastest cores on the chip, also has issues that can impact lightly-threaded applications (like games). Intel divulged that it tested the 5950X before the patches were available, leading to accusations that the benchmarks weren't representative of the true differences between the two chips. However, Intel did tout gaming performance benchmarks with Alder Lake against AMD's Ryzen 9 5950X last week. That raised concerns that the bug could possibly result in unfair comparisons, but the quick resolution has at least removed that concern. Making things worse for AMD, Windows 11 has new scheduler optimizations specifically for Alder Lake, so reviewers will use the new operating system for testing. Meanwhile, the synthetic 元 cache and bandwidth measurements improved dramatically.įrankly, the bugs couldn't have come at a worse time: Intel is on the cusp of launching its seemingly-potent Alder Lake chips that could swing the advantage back in its favor.
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.
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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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