AMD Threadripper 3970X under heavy AVX2 load: Defective by design?

Re:AMD Threadripper 3970X under heavy AVX2 load: Defective b... by paol on Friday February 21, 2020 @03:50PM (#22386579)

I get your desire to be conservative here, but this is not good practice with modern CPUs. For example AMD desktop CPUs are designed with DDR4 speeds well north of 3000MHz in mind[1]. Problem is that JDEC profiles simply don't go that hight for some reason, so you you have to run with XMP profiles if you want the chip to perform as the manufacturer intended.

[1] https://www.anandtech.com/show/14525/amd-zen-2-microarchitec...

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Re:AMD Threadripper 3970X under heavy AVX2 load: Defective b... by jrockway on Friday February 21, 2020 @07:40PM (#22388531)

I look at Intel ARK and use what they say the CPU is rated for. I am a couple generations behind, so not at the bleeding edge. (Haven't used an AMD CPU, but I would find their equivalent if I did.)

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Re:AMD Threadripper 3970X under heavy AVX2 load: Defective b... by Filligree on Saturday February 22, 2020 @08:56AM (#22391023)

Keep this in mind for when you do: The first boot will be in a "failsafe" 2133MT configuration, but the fabric clock is intended to ramp all the way up to 1800MHz.

You need 3600MT to match that while keeping 1:1 sync, which means XMP unfortunately.

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