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> Users can mitigate their risk by upgrading their memory to DDR4 with targeted row refresh (TRR) enabled.

How does one enable this feature? Is it in the BIOS?

I'm not sure if it is an option you can enable/disable in BIOS, but if your CPU and memory have support for pTRR/TRR it should be enabled.

Ivy Bridge and newer processors should support pTRR and possibly even TRR.

Do AMD processors support it?