Microsoft is about to flip a switch on hundreds of millions of Windows 11 PCs, and PC gamers are the ones who will feel it first. Starting with the October 13, 2026 Patch Tuesday update, Windows 11 will automatically turn on Memory Integrity — also known as Hypervisor-Enforced Code Integrity, or HVCI — on every eligible machine that currently has it switched off, according to PCWorld. The change closes a long-standing security gap that has let malicious kernel-mode drivers slip past Windows defenses. It also revives a debate that has simmered since 2022: how much frame rate is an acceptable price for stronger malware protection.
Outlets including The Verge, Windows Latest, and Germany’s BornCity blog have all confirmed the rollout timeline this week, and independent testing going back to 2021 gives a clear if uneven picture of the performance cost. Depending on the hardware, gamers could see anywhere from a barely noticeable 1-2% dip to a 15% frame-time hit, based on benchmark data collected by Tom’s Hardware and cited across multiple reports. Here’s what’s actually changing, why Microsoft is finally forcing the issue in 2026, and what it means for anyone building or buying a gaming PC this fall.
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What Changes on October 13, 2026
PCWorld reports that starting with the October Patch Tuesday quality update, all supported Windows 11 PCs will enable Memory Integrity by default if it isn’t already on. This isn’t a fresh-install-only policy this time. Windows Latest describes the mechanism as an automatic enablement on eligible devices, following a compatibility readiness check, and Microsoft says it will “respect any existing opt-outs” a user has already set. WindowsForum’s coverage of the change frames it plainly: Windows quality updates will start turning memory integrity on for machines whose setting is currently off, provided the device passes the readiness check first.
That distinction matters. Microsoft already made Memory Integrity the default for brand-new Windows 11 22H2 installations and fresh PCs back in 2022, but explicitly left existing upgraded machines untouched. The October 2026 change is the first time Microsoft has pushed the feature onto systems that were previously running with it off, which is why the rollout is generating so much attention among PC gamers and system builders right now.
What Memory Integrity (HVCI) Actually Does
Memory Integrity is Microsoft’s consumer-facing name for Hypervisor-Enforced Code Integrity, a feature that only allows trusted, digitally signed kernel-mode code and drivers to load. The Verge describes its purpose directly: stopping untrusted kernel-mode code and malicious drivers from ever reaching the Windows kernel. Windows Latest adds that the feature specifically blocks malicious drivers from reaching that kernel layer, which is the part of the operating system attackers most want to compromise because it runs with the highest level of trust on the machine.
Technically, Memory Integrity is one piece of Virtualization-Based Security, a broader Microsoft security architecture that uses the Windows hypervisor to isolate sensitive processes from the rest of the operating system. Instead of trusting the kernel to police itself, VBS runs code-integrity checks inside a walled-off virtual environment that even a compromised kernel can’t tamper with. Japanese outlet Gigazine describes this as inspecting suspicious processing inside a virtual environment, which lines up with how Microsoft and independent researchers describe the VBS/HVCI architecture elsewhere.
The Benchmark Numbers Gamers Are Actually Seeing
The performance conversation isn’t new, but the numbers being recirculated this week come from several rounds of independent testing. According to a summary published by WindowsForum, Tom’s Hardware testing found that enabling VBS and HVCI together tends to reduce average gaming performance by a mid-single-digit percentage on modern hardware, typically in the 3% to 6% range on a geometric-mean basis across a game test suite, with some individual titles showing larger drops.
Older test data cited by WindowsForum, from a 2021 study spanning four desktop CPU platforms, put the geometric-mean gaming performance reduction at roughly 3.3% to 5.7%. A more detailed 2023 Tom’s Hardware test using an Nvidia RTX 4090 paired with an Intel Core i9-13900K — summarized by TechLab.hk — found average frame-rate differences of around 5% with VBS switched on, climbing to nearly 10% in some games, and 1% low frame times (a key stutter indicator) worsening by as much as 15% in the toughest cases. BornCity and a widely shared summary from International Cyber Digest both point to that same “up to 15% slower” figure as the headline result from Tom’s Hardware’s testing.
There’s also an older, specific data point worth remembering: PCWorld’s 2022 coverage of Core Isolation cited a Tom’s Hardware benchmark showing an Intel Core i7-11700 losing about 7% of its performance in Red Dead Redemption 2 with these protections active — a hit PCWorld compared to losing an entire processor generation’s worth of gains.
| Test Configuration | Reported Performance Impact | Source |
|---|---|---|
| Intel Core i7-11700, Red Dead Redemption 2 | ~7% average FPS drop | Tom’s Hardware via PCWorld |
| Four desktop CPU platforms, 2021 test suite | 3.3%–5.7% geometric-mean FPS reduction | WindowsForum |
| RTX 4090 + Core i9-13900K, 2023 test suite | ~5% average FPS drop, up to ~10% in some titles, 1% lows down up to 15% | Tom’s Hardware via TechLab.hk |
| Modern CPUs with MBEC / AMD equivalent | ~1%–5% overhead in everyday workloads | PCMasterInsider |
| RTX 3080-class GPU on modern platform | Often under 2% FPS impact | Chainmind |
| Older or integrated GPU with older AMD drivers | 5%–10%+ FPS impact, with reported stutter | Chainmind |
Which PCs and Games Take the Biggest Hit
PCWorld’s reporting on the October 2026 rollout is blunt about who feels this most: performance losses from Memory Integrity are most likely to be noticeable on computers with older hardware. PCMasterInsider explains why. Modern CPUs include hardware-accelerated Mode-Based Execution Control, or MBEC (AMD has an equivalent), which was built specifically to reduce the overhead that virtualization-based security features impose. Chips without that hardware acceleration have to fall back on slower, software-based checks, and that’s where the bigger frame-rate losses show up.
Chainmind’s rundown of the 2026 rollout puts a finer point on it: high-end rigs built around roughly RTX 3080-class GPUs and current CPUs often see FPS losses under 2%, while mid-range or older systems — especially laptops or machines running older AMD graphics drivers — can lose 5% to 10% or more, with noticeable stutter in fast-paced shooters. CPU-bound games are consistently flagged as the worst case across every source in this roundup, since Memory Integrity’s overhead lands on the processor, not the graphics card. That’s also why even a high-end RTX 4090 system showed measurable 1% low degradation in Tom’s Hardware’s testing — the bottleneck isn’t GPU horsepower, it’s CPU-side code-integrity checking.
How to Check or Turn Off Memory Integrity
For gamers who want to prioritize frame rate over the added kernel protection, the setting lives in Windows Security. WindowsForum and PCWorld both point to the same path: Windows Security > Device security > Core isolation > Memory integrity. PCWorld notes that Microsoft’s own past guidance told performance-focused gamers they could temporarily disable Memory Integrity and Virtual Machine Platform while playing, with an explicit warning that doing so reduces the machine’s security posture.
The setting can also be checked from a terminal, which is useful for anyone managing multiple machines or scripting a check before a LAN party or benchmark run.
REG QUERY "HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity" /v Enabled
msinfo32
:: Look for "Virtualization-based security" and
:: "Kernel-mode Hardware-enforced Stack Protection"
:: under System SummaryWindows Latest notes that the automatic October rollout will run a readiness check and respect any opt-out a user has already configured, and WindowsForum adds that only “eligible devices” — those without known incompatible drivers — will actually have the setting flipped on by the update. In other words, some older or driver-quirky systems may simply be skipped rather than forced through the change.
Why Microsoft Is Pushing This Now
None of the reports reviewed for this story tie the October 2026 change to a single named vulnerability or breach. Instead, PCWorld, The Verge, BornCity, and Windows Latest all frame it as part of a broader hardening push against kernel-level malware and malicious or vulnerable drivers — a category of attack security researchers have flagged for years as a favorite entry point for rootkits and ransomware that need to bypass antivirus protection at the deepest level of the OS.
Microsoft has been consistent about where it lands on the trade-off. In an email to PCWorld back in 2022, when Core Isolation first became default for new PCs, Microsoft stated: “Core Isolation will be enabled by default for new installations and fresh PCs, ensuring devices are as secure as possible.” Four years later, the October 2026 rollout is Microsoft extending that same logic to the installed base of existing PCs rather than just new ones — accepting the gaming-performance criticism as the cost of closing a gap that new PCs closed years ago.
From Opt-In Feature to Mandatory Default: A Short History
Memory Integrity and the broader Virtualization-Based Security stack have existed as an available, mostly opt-in Windows feature for years before this rollout, primarily aimed at enterprise and security-conscious users willing to trade some performance for kernel protection. The first real shift toward “on by default” came with Windows 11 version 22H2, when Microsoft quietly started shipping Core Isolation’s Memory Integrity switched on for new installations and factory-fresh PCs — but, crucially, not for machines that had already been upgraded to that build. PCWorld’s coverage from that period noted this was a first step, not a full rollout.
That half-measure is exactly what October 13, 2026 fixes. Instead of only protecting PCs at the point of manufacture or clean install, Microsoft is now pushing the setting onto the much larger population of machines that have been running Windows 11 for months or years with the protection switched off — which is also precisely the population most likely to include older CPUs without MBEC-style hardware acceleration, and therefore the population most likely to notice a frame-rate difference.
| Date | Milestone | Source |
|---|---|---|
| Windows 11 22H2 (2022) | Memory Integrity enabled by default for new installs and fresh PCs only, not upgrades | PCWorld |
| 2022 | Microsoft advises performance-focused gamers they can temporarily disable the feature, with a security-reduction warning | PCWorld |
| 2023 | Tom’s Hardware benchmarks show up to 15% slower games with VBS and Memory Integrity enabled together | Tom’s Hardware via BornCity, TechLab.hk |
| October 13, 2026 | Memory Integrity auto-enabled by default on all eligible existing Windows 11 PCs via Patch Tuesday | PCWorld, The Verge, Windows Latest, BornCity |
Market Impact: What This Means for PC Gaming Hardware
The timing lands awkwardly for a PC hardware market already under pressure from other directions this year, including the DDR5 memory price spikes and the ongoing CPU generational race between AMD and Intel. A default-on security feature that disproportionately costs older CPUs a larger share of their frame rate gives PC builders one more reason to prioritize newer processors with hardware-accelerated code-integrity support when planning an upgrade, rather than stretching an aging CPU another generation.
It also puts pressure on competitive and esports-adjacent players who chase every available frame and consistent frame time. A 1% low regression, the kind Tom’s Hardware measured worsening by up to 15% in its testing, matters more to players sensitive to stutter in fast-paced shooters than an average FPS number ever will. Gamers looking to claw back headroom elsewhere on the system, such as through a careful GPU overclock or by revisiting recent DLSS 5 performance benchmarks, may find those gains partly offset by this change. Expect enthusiast forums and hardware reviewers to keep re-litigating the on/off decision every time Microsoft touches this setting, much as they have since Core Isolation first shipped.
How Windows Compares to Other Platforms on This Trade-Off
WindowsForum’s broader analysis of Windows 11 gaming optimization settings places VBS/HVCI in the same category as other security or stability features that trade a few percentage points of performance for protection — describing rigorous testing that shows average gaming slowdowns in the low single digits, climbing toward 5% in less favorable configurations, with outliers going higher on specific titles or older hardware. That framing is a reasonable way to think about the trade-off generally: stronger kernel or hypervisor-level isolation, wherever it’s implemented, tends to carry a measurable but usually modest overhead, and the size of that overhead depends heavily on whether the underlying hardware has dedicated acceleration for the isolation work or has to do it entirely in software.
What Game Studios and Chipmakers Have (and Haven’t) Said
None of the sources reviewed for this story include a direct, on-record statement from Nvidia, AMD, Intel, or a specific game studio responding to the October 2026 rollout. The public record so far is dominated by Microsoft’s own messaging and independent benchmark testing from outlets like Tom’s Hardware, rather than pushback or endorsement from hardware or game makers. PCMasterInsider’s reporting on MBEC and its AMD equivalent implies at least indirect chipmaker cooperation on reducing the overhead over the past several hardware generations, since that acceleration had to be designed into silicon well before this default-on policy existed — but that’s inference from the hardware roadmap, not a direct statement about this specific rollout. It’s the same kind of silicon-level trade-off tracked across the broader AI chips and CPU hardware roadmap this year, where security and efficiency features increasingly get built into the chip itself rather than left to software alone.
What Happens Next
A few things look likely to play out over the next few months, based on how this same debate unfolded after the 22H2 default-on change in 2022:
- Expect a fresh wave of independent benchmark testing from outlets like Tom’s Hardware within weeks of the October 13 rollout, comparing pre- and post-update frame rates on a range of CPU generations rather than relying on 2021-2023 data.
- Enthusiast guides and forum threads walking through how to disable Memory Integrity for gaming will spike in search traffic immediately after the rollout, mirroring what happened around the 22H2 change.
- Newer CPU generations with more mature MBEC-style acceleration should continue narrowing the performance gap over time, making this less of a story with each hardware refresh cycle — but only for buyers of current-generation chips.
- Older systems, particularly the population of Windows 11 PCs running Alder Lake-class Intel chips or earlier AMD Zen 3-class hardware without full acceleration support, will likely remain the segment most vocal about disabling the setting.
- Microsoft is unlikely to reverse course given its consistent multi-year messaging on kernel security, so the more realistic outcome is continued refinement of the readiness checks that decide which devices get the feature turned on automatically.
The Bottom Line for PC Gamers
The October 13, 2026 change doesn’t require gamers to do anything — that’s precisely the point, and also precisely what’s generating pushback. For anyone on a modern CPU with hardware-accelerated code integrity support, the practical difference will likely be in the low single digits, in line with the 1%-5% range PCMasterInsider describes for MBEC-equipped systems. For anyone running an older CPU, particularly in CPU-bound titles, the more pessimistic 7-15% figures documented by Tom’s Hardware are the more realistic expectation. Either way, the setting is one toggle away in Core Isolation for anyone who decides the frame-rate cost isn’t worth it — with the standard caveat, repeated by Microsoft itself since 2022, that doing so does reduce protection against kernel-level malware.
Frequently Asked Questions
What is Windows 11 Memory Integrity?
Memory Integrity, also called Hypervisor-Enforced Code Integrity (HVCI), is a Windows security feature that only allows trusted, digitally signed code to run in the Windows kernel, blocking malicious or unsigned drivers from loading, according to reporting from The Verge and Windows Latest.
When does Microsoft turn on Memory Integrity by default?
Starting with the October 13, 2026 Patch Tuesday update, Windows 11 will automatically enable Memory Integrity on eligible PCs that currently have it switched off, per PCWorld and BornCity.
How much FPS will I lose from Memory Integrity?
It varies significantly by hardware. Tom’s Hardware testing summarized by WindowsForum and TechLab.hk shows a mid-single-digit percentage drop (roughly 3%-6%) on modern hardware with MBEC-style acceleration, but older CPUs and specific titles have shown drops as steep as 7% to 15%, especially in 1% low frame-time metrics.
How do I disable Memory Integrity on Windows 11?
Go to Windows Security > Device security > Core isolation > Memory integrity and toggle it off. Microsoft’s own past guidance, cited by PCWorld, warns this reduces your PC’s protection against kernel-level malware.
Will my PC be forced to enable this setting even if I don’t want it?
Windows Latest reports that the automatic rollout runs a readiness check and respects existing opt-outs, meaning PCs where a user has already manually disabled the setting should not have it silently re-enabled. WindowsForum adds that devices with known incompatible drivers may also be skipped entirely.
Why is Microsoft doing this now instead of years ago?
Microsoft already made Memory Integrity default for new Windows 11 22H2 installations back in 2022 but left existing upgraded PCs untouched. Reports from PCWorld, The Verge, and BornCity describe October 2026 as Microsoft finally extending that same default protection to the much larger population of already-running Windows 11 PCs, as part of a broader effort to block kernel-level malware and malicious drivers.
Are all games affected equally?
No. Sources including Chainmind and Tom’s Hardware indicate CPU-bound games and fast-paced shooters sensitive to frame-time consistency show the most noticeable impact, while GPU-bound titles on high-end hardware tend to show smaller average FPS losses.
Does gaming on GeForce NOW or another cloud service avoid this issue?
Cloud gaming shifts the rendering workload to remote servers, so a local Windows Memory Integrity setting on your own PC has no bearing on server-side performance. The reports reviewed for this story only discuss local Windows 11 gaming performance, not cloud gaming services.
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