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Author Topic: Spectre/Meltdown patches for Mac Pro and others  (Read 363 times)
Spacedust
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« on: January 27, 2018, 11:32:27 PM »

Apple claims Macs are safe under macOS, but how about Windows?

inSpectre reports under Windows 7 on my Mac Pro 5,1:

Quote
Spectre & Meltdown Vulnerability
and Performance Status

Vulnerable to Meltdown: NO
Vulnerable to Spectre: YES!
Performance: SLOWER

If I disable this Meltdown patch I've got instantly about 13-15% more CPU power!

To patch Spectre under Windows we need another firmware (EFI) update which should be released at least for Mac Pro 5,1.
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Squishy Tia
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« Reply #1 on: January 28, 2018, 06:09:43 AM »

I don't see how that machine wouldn't be vulnerable to Meltdown as the CPU still does speculative processing even in Windows via Boot Camp. I would say that inSpectre doesn't know how to handle the Macs and their proprietary EFI configurations.
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Spacedust
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« Reply #2 on: January 29, 2018, 12:41:38 PM »

You're referring to Spectre. Meltdown can be patched via kernel update and that was done via simple Windows update.

Without Meltdown patch:



With Meltdown patch - performance drop is about 13%:

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