Microsoft halts AMD Meltdown and Spectre patches after reports of unbootable PCs

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The issue was particularly tricky for those running Windows 10 Home, due to the OS not providing a simple way for users to defer updates. The patch for Windows Server "shows a more significant performance impact", Myerson explained.

The PC industry is still trying to come to grips with the fallout from the revelation of the Meltdown and Spectre chip vulnerabilities. But the TL;DR is simple; the fixes impact system performance. You do not need to apply these mitigations to isolate your Windows Server VMs from other VMs on a virtualized server, as they are instead only needed to isolate untrusted code running within a specific Windows Server instance. But even if you're tempted not to patch, please do!

Intel stock traded down 1.3% early Tuesday afternoon, at $44.15 in a 52-week range of $33.23 to $47.64.

Affected machines have been forced into "an unbootable state" because some AMD chips do not match up with documentation previously given to Microsoft by the semiconductor manufacturer, according to the Redmond, Wash. -based computing giant.

Surface devices will also be patched, Microsoft said, beginning today.

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Like every major tech company, Microsoft has been pushing out updates to help mitigate the unprecedented vulnerabilities known as Meltdown and Spectre. "Windows operating system updates to devices with impacted AMD processors at this time". Microsoft's latest tests reflect both.

On the other hand, Windows 7 and 8 PCs with the processors like Haswell will notice a significant decrease in system performance. Myerson noted that Microsoft is now performing its own benchmark studies and plans to publish the results when done. Additional benchmarks will be published in the weeks ahead, Microsoft said.

Security researchers disclosed the flaws on January 3 that affected almost every modern computing device containing chips from Intel, AMD and ARM Holdings, owned by Japan's SoftBank Group Corp. The company doesn't expect most users to notice this slowdown on modern hardware because we're talking about milliseconds, but the performance degradation should be more apparent on older hardware. The company has provided a reasonably detailed description of the impact. It said the number of chips affected by Meltdown was significantly less.

"Microsoft is working together with AMD to fix the problem and renewal of security updates for AMD devices through the Windows Update Center and Windows Server Update Services (WSUS)", she said.

Microsoft, Intel and PC manufacturers are still dealing with the Meltdown and Spectre CPU vulnerabilities these days, and contrary to Intel's reassuring statements from last week, the fixes will have a performance impact, especially on older PCs.

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