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[–] GumbyTM 0 points 16 points (+16|-0) ago 

Info is not fully released yet so no one knows anything for sure but from everything I've seen AMD should not be affected performance wise. As of this afternoon this problem now affects basically everyone. ARM, AMD and Intel.

The mitigation for this is a software workaround (kernel patch) AMD says theirs won't hit performance.

Sauce:

http://fortune.com/2018/01/03/intel-kernel-security-flaw-amd/

AMD said its chips were affected by some but not all of a series of related security exploits uncovered by researchers. AMD has already developed a simple software fix for its chips that will not impact PC performance, an AMD spokesman said. “Due to differences in AMD’s architecture, we believe there is a near zero risk to AMD processors at this time,” the company said in a statement. “We expect the security research to be published later today and will provide further updates at that time.”

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[–] MetalAegis 0 points 1 points (+1|-0) ago  (edited ago)

What would the potential harm be if hypothetically one had an AMD machine and decided not to update/patch at all?

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[–] B3bomber 0 points 1 points (+1|-0) ago  (edited ago)

Adding to what the other person said: Script blocker on browser (ALL of them). Only allow scripts from sites you need to have scripts run on. Noscript or scriptsafe for FF based, scriptsafe for chromium based.

ublock origin for blocking ads (and the malware usually embedded in them). FF/chrome based have this.

If they do not allow addons to manage these, DO NOT USE THAT BROWSER.