The official HWBOT Team CUP 2023 - AMD thread.

[superpatodonaldo]

Why 4P cpus? Just 4core enabled?

[yosarianilives]

7 hours ago, superpatodonaldo said:

Why 4P cpus? Just 4core enabled?

One core per module enabled

[damric]

@Leeghoofd can you clarify? Can we just disable cores to meet the 4 core requirement?

[Mr.Scott]

2 hours ago, damric said:

@Leeghoofd can you clarify? Can we just disable cores to meet the 4 core requirement?

Never

 

[mickulty]

9 hours ago, damric said:

@Leeghoofd can you clarify? Can we just disable cores to meet the 4 core requirement?

The "4P" option represents one core per compute unit mode - certainly available on gigabyte boards, supposedly a certain bios on CHV, not sure about asrock and msi.  It was added because it's vaguely analagous to p-core modes on ADL (rankings like 12900K (8P)).

The difference compared to just disabling cores is that each core gets a full 3-wide decoder 100% of the time, a full 256-bit FPU 100% of the time, and an exlusive 2MB of L2 cache.  You can look at ths as the "P-core" and the extra integer units that normally share these resources as the "E-core".  Another way to think of it is disabling CMT.

I found a screenshot of the settings on a 990FX-UD7 but even cheapo gigabyte AM3+ boards like the 78LMT-USB3 have the setting.  Also attached are block diagrams (By Shigeru23 - Made by uploader, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=17130259) annotated to show the difference.

Realistically a 78LMT-USB3 even being a fairly bunnyextraction board but with true 1 core per cu mode will still beat a crosshair with disabled cores.  Imagine 12900K with 4P and 4E-cores vs 8P...

[damric]

I'm talking about the AM4 section but I guess that also applies.

[Leeghoofd]

Correct, no core disabling to simulate another CPU allowed