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Question zen3 core ordering

Soulkeeper

Soulkeeper

Diamond Member
I was wondering what the correct ordering is for zen3 on the die.

I created this image to be what I think it might be:
zen3-core-layout-01.png

Can anyone verify which is the correct ordering ?
IE: inside the bios curve offsets for core 0-15 will correspond to which cores.
Thanks
 
If you have access to the CPU you can check apic IDs of each core. Iirc the lowest bit is the thread number, the next 3 bits on zen 3 should be the core number within ccx and then would be the ccx number (then package number if you have multiple sockets).

Note that on Linux apic ID != core number. /proc/cpuinfo shows the ID of each core.

I don't know which core number within ccx is which though.
 
It's amazing that no pictures online show the actual ordering.
I know they can disable any core they want at the factory, influencing the ordering.
But I imagine it's not random.

Basically, what i'm wondering is if they order from top/bottom or right/left on the actual physical die. They could be alternate from right/left side. My picture is just one of several possible orderings.
 
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