The truth about CPU power consumption

[alaricljs]

Here's a good look at AMD chipsets, power requirements, and capabilities: Site Launch Exclusive: All the Juicy Details on AMD's Quirky Chipset Solutions for AM5!

Includes the Knoll X300 on that Asrock board, which is like an hdmi dummy plug for your CPU. Just enough to make things run. But ~7w for the single chipset on "normal" mobos doesn't explain the whole story. Some of the additional wattage is the IO die on non-G CPUs. Some is higher PCIe power requirements since the Gs have a block of them purely on-die, there's less wattage to drive them.

 

[FrankTL]

Here's a good look at AMD chipsets, power requirements, and capabilities: Site Launch Exclusive: All the Juicy Details on AMD's Quirky Chipset Solutions for AM5!

Includes the Knoll X300 on that Asrock board, which is like an hdmi dummy plug for your CPU. Just enough to make things run. But ~7w for the single chipset on "normal" mobos doesn't explain the whole story. Some of the additional wattage is the IO die on non-G CPUs. Some is higher PCIe power requirements since the Gs have a block of them purely on-die, there's less wattage to drive them.

With 'IO die on non-G CPUs' I am guessing you mean to say that the 8600G only has 16 PCIe lanes exposed vs 24 for non-G regular desktop CPUs. If not, please be more specific.

While these additional 8 PCIe lanes are not exposed, they are used to drive the onboard graphics which is a much larger block of 8 RDNA3 CUs + a NPU vs 2 RDNA2 CUs on Ryzen 7000 series.

I'd love to see idle power comparison of a single-chiplet non-G Ryzen vs a dual-chiplet model one step above in the same series, in an effort to try and estimate the power budget consumed by the infinity fabric to interconnect the CCXs.

 

[RolloZ170]

in an effort to try and estimate the power budget consumed by the infinity fabric to interconnect the CCXs.

that is not the point. the IO Die is a bar bus, runs at mem clock and is not same silicon than core die.

 

[FrankTL]

that is not the point. the IO Die is a bar bus, runs at mem clock and is not same silicon than core die.

Ahh interesting.. so the 8000 series has integrated IO vs IOD for 7000/9000 series. Ok that could explain quite a bit...