Lowering idle power on Zen 4?

[chrcoluk]

Fair enough, I assume my 5600G is only one CCD, idle power ironically is opposite for me, my AMD system is 95-99% idle or very low load.
Desktop varies, but I can for many days in a row just use it for work, browsing and media consumption all of which are low power, but then on days I game can be several hours of gaming.

 

[Zach_01]

Yeah I get that, but my Zen 3 system is considerably lower, and I remember that having similar reported idle power, or maybe Zen 3 is officially lower and I am thinking nonsense.

My quoted number is total system power draw, 30W would be impossible if the CPU+SOC is consuming that by itself.

30W total system power? A Ryzen system?
Hardly

My PSU has its own sensors for power (output/input)
Never saw it below 90W (100~105W on socket)
At dips the CPU is 35W + GPU 20W + 35W the rest of the system that includes a 420mm AIO, 4x120mm fans, 2x16GB DRAM, 2xNVMe, 2xSATA SSD

What does HWiNFO tells you for the CPU?

 

[chrcoluk]

30W total system power? A Ryzen system?
Hardly

My PSU has its own sensors for power (output/input)
Never saw it below 90W (100~105W on socket)
At dips the CPU is 35W + GPU 20W + 35W the rest of the system that includes a 420mm AIO, 4x120mm fans, 2x16GB DRAM, 2xNVMe, 2xSATA SSD

What does HWiNFO tells you for the CPU?

See couple of posts up, I screenshotted the smart plug power measurement.

This is the system power, 3 case fans, 1 AMD stock CPU fan, 3 SATA SSDs and 1 NVME SSD. There is 4 spindles in the machine but they are currently not spinning. Using iGPU no dGPU.

If you think mine is low, I found a blogger doing similar with a intel system and has idle power circa 10w which is crazy for desktop hardware. According to him low wattage PSU and low end boards are key, so maybe that I only have a b450 pro 4 as board and a fairly low end PSU by todays standards is helping as well.

System is running proxmox (debian), currently powered up VMs are TrueNAS and a FreeBSD VM, so I cant run hwinfo. I do plan to install the software level 1 tech used in one of his videos at some point though.

 

[Zach_01]

See couple of posts up, I screenshotted the smart plug power measurement.

This is the system power, 3 case fans, 1 AMD stock CPU fan, 3 SATA SSDs and 1 NVME SSD. There is 4 spindles in the machine but they are currently not spinning. Using iGPU no dGPU.

I was thinking about the iGPU
And its a 5600G, ok
On typical nonAPU Zen3 and single CCD the SoC power can be cut in half from dual CCD CPUs. About 7-10W.
Not sure about the "invisible" chiplet interconnection power but that could be also ~half.

Still curious about HWiNFO64 report on the 5600G about the sensors I posted.

 

[chrcoluk]

I was thinking about the iGPU
And its a 5600G, ok
On typical nonAPU Zen3 and single CCD the SoC power can be cut in half from dual CCD CPUs. About 7-10W.
Not sure about the "invisible" chiplet interconnection power but that could be also ~half.

Still curious about HWiNFO64 report on the 5600G about the sensors I posted.

View attachment 375618

I dont mind checking when I next boot windows, as the 850 pro has a windows install on it, but that could be ages away, if I remember when I next reboot this thing, I will check hwinfo.

 

[rubiconlexicon]

Nothing persists.
Its the nature of modular design. Chiplets.
As long as AMD uses chiplets that is the case. On latest Zen4/5 maybe things improved but still its a thing.

The interconnection between them is "eating" some power

View attachment 375611

Lets break it down
Total (CPU PPT) package power (avg) 45.5W
Cores: 14W
SoC: 17.8W
Cores+SoC: 31.8W

45.5 - 31.8 = 13.7 =~14

~14W is consumption of the chiplet(s) interconnection.
There is no individual sensor for it. You have to find it like above.

On my 7700X I have a reading "Core+SoC+MISC Power" which usually sits at around 7W lower than Package Power. Could interconnect power simply be Package - Core+SoC+MISC for me?

 

[Zach_01]

On my 7700X I have a reading "Core+SoC+MISC Power" which usually sits at around 7W lower than Package Power. Could interconnect power simply be Package - Core+SoC+MISC for me?

Could be... But I do not really know what MISC includes.

And the most accurate package power is "CPU PPT" (Package Power Tracking) that is pulled straight from CPU.
Classic "CPU Package Power" can be iffy as its a board reading.

 

[rubiconlexicon]

Could be... But I do not really know what MISC includes.

And the most accurate package power is "CPU PPT" (Package Power Tracking) that is pulled straight from CPU.
Classic "CPU Package Power" can be iffy as its a board reading.

The "CPU Package Power" I mentioned is under the "CPU [#0]: AMD Ryzen 7 7700X: Enhanced" section in HWINFO. Is that still a board reading? I thought everything under this section was from CPU.

 

[AusWolf]

Why are people so obsessed with lowering which is somewhat a normal idle power consumption for a desktop computer? if you want 5w idle then get a laptop that will throttle under any kind of load and be happy you are saving the planet with a 20-25w power saving which is less than an old style lightbulb, better yet just don't use your computer, 0w=infinity better than 25-30w CPU idle/desktop usage, all the while having a GPU that can munch 300w during gameplay is fine, but god forbid your CPU uses 30w at low load/idle, I am sure Bill Gates and the rest of the climate avengers would be happy to take a private jet trip to your house to tell you how you are causing climate change, cows farting also needs addressing btw

Did you read my post just two above yours? +10 Watts on your SoC means 10 Watts less headroom for the cores under full load, and thus, lower all-core performance on a severely power limited CPU such as the 7700 (non-X).

It also means more heat, which could be an issue when your cooling allows the CPU to reach its thermal limit.

For example, my 7800X3D runs at 85-86 °C when I'm crunching with BOINC with 4800 MHz RAM and 1 VSOC at a constant 4.8 GHz core speed. If I enable EXPO at 6000 MHz, VSOC jumps to 1.3 (I could manually lower it to 1.2 with not much difference in power used), which also means the CPU reaches its 89 °C limit under load and lowers core clocks. I'd much rather have higher and stable core clocks and lower temperatures than a higher memory clock that I don't feel literally anywhere.

Fair enough, I assume my 5600G is only one CCD, idle power ironically is opposite for me, my AMD system is 95-99% idle or very low load.
Desktop varies, but I can for many days in a row just use it for work, browsing and media consumption all of which are low power, but then on days I game can be several hours of gaming.

The 5600G isn't just one CCD... It's a single chip CPU with no infinity fabric (and no CCD basically), so your idle power should be a lot lower than any chiplet Ryzen.