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 Post subject: Ryzen 2700X idle power consumption
PostPosted: Tue Aug 28, 2018 4:59 am 
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Joined: Wed Feb 26, 2014 5:07 am
Posts: 9
Hi,

I currently own mini-itx 4770k build that consumes on idle about 26W with Seasonic Platinum Fanless PSU. Currently I'm thinking about R 2700X build. Reviews around show about 50W idle power draw but almost all use 700+ W PSU (mine is 400W). Anyone have experience regarding idle power draw on R 2700X on more efficient/lower power PSU/small itx board?

Best regs.


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 Post subject: Re: Ryzen 2700X idle power consumption
PostPosted: Tue Aug 28, 2018 7:47 am 
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Location: Guatemala
I can't help you much as i never built with a 2700X nor equivalents, but i recently did a build on TR1950x (link on my signature) and my idle was 50W, my PSU isn't small though, but if 2700X is anything similar, the CPU don't downclock as low as intels, i saw 2133 as the minimum clocks on TR, so this would probably limit also how low it will get. My guess is you wont reach as low as 4770K on idle, but how low you can get will depend on a lot of things, PSU is one of them, the motherboard power delivery and overall consumption is another, what you have connected is another factor (hdds, usbs, etc).

If idle is so important to you, and you do want a 8 core, wait a month for the i9 9900K, i bet it will downclock to 800mhz as your 4770K (as all coffeelake), probably wont have a low idle as its more cores, but my guess is going to be close, probably with your same setup i would guess 30-35W idle.

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 Post subject: Re: Ryzen 2700X idle power consumption
PostPosted: Tue Aug 28, 2018 8:05 am 
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No direct answer...but some comments:

When operating down in the sub-50W range, all the Gold and better PSUs tend to have power losses in roughly the same range..with maybe a 5W spread between the best and worst, no matter the PSU sizing.

Also, Ryzen setups require a discrete gfx card..which will add another 5-10W to the mobo reviews.

Finally, reviews tend to focus on the higher end mobos with more VRM stages for better overclocking and more on-board features/components..which adds to idle power use.

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 Post subject: Re: Ryzen 2700X idle power consumption
PostPosted: Tue Aug 28, 2018 10:39 am 
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Joined: Sat Aug 24, 2002 10:24 pm
Posts: 22
Location: San Francisco
I also have an Intel 4770K and I'm looking to upgrade soon. My UPS reports a system idle power consumption of 40W (the resolution of this figure is very coarse). However, I also have a GTX1080, 650W PSU, and multiple SSDs and fans.

Idle system power consumption numbers reported by guru3d.com:

8700K/Gaming 7: 50W
8700K/Maximus X: 50W

2700X/Gaming 7: 50W
2700X/Crosshair 7: 51W

1950X/Taichi: 85W
1950X/Designare: 89W
1950X/Zenith: 95W
1950X/Gaming 7: 96W

2950X/Zenith: ~75W (estimated from chart)

From these numbers, I doubt the 9900K will improve on the 2700X idle power consumption. There does seem to be a noticeable improvement for the 2950X vs 1950X though.

Some AMD motherboards allow for CPU voltage offset in the BIOS - this can reduce power consumption, sometimes significantly as some 2700X boards will aggressively ramp voltage with frequency.

Two other items I've noted: Windows (at least in some versions) will set the minimum processor state in the AMD Balanced Power plan to 90%. Here's how to reduce it: https://www.reddit.com/r/Amd/comments/6 ... _manually/

A caveat to the previous item: if an AMD core is well and truly idle then it will enter a sleep state that will not be obvious to Windows. See this comment: https://www.reddit.com/r/Amd/comments/6 ... y/dm6gfkv/

Also, the BIOS on some AMD motherboards allows you to adjust the P-states. Google for more details.


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 Post subject: Re: Ryzen 2700X idle power consumption
PostPosted: Tue Aug 28, 2018 10:46 pm 
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Joined: Wed Feb 26, 2014 5:07 am
Posts: 9
Abula wrote:
I can't help you much as i never built with a 2700X nor equivalents, but i recently did a build on TR1950x (link on my signature) and my idle was 50W, my PSU isn't small though, but if 2700X is anything similar, the CPU don't downclock as low as intels, i saw 2133 as the minimum clocks on TR, so this would probably limit also how low it will get. My guess is you wont reach as low as 4770K on idle, but how low you can get will depend on a lot of things, PSU is one of them, the motherboard power delivery and overall consumption is another, what you have connected is another factor (hdds, usbs, etc).

If idle is so important to you, and you do want a 8 core, wait a month for the i9 9900K, i bet it will downclock to 800mhz as your 4770K (as all coffeelake), probably wont have a low idle as its more cores, but my guess is going to be close, probably with your same setup i would guess 30-35W idle.


As far as this test shows:
https://www.anandtech.com/show/11697/th ... -review/19
TR1950 takes about 31W idle and here R2700x takes about 13W:
https://www.tomshardware.com/reviews/am ... 71-12.html
Here though TR1950X takes 45W idle and this doesn't match anand review...

Could you tell me idle power consumption of TR1950X from hwmonitor?
Anyone with 2700X able to check this?


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 Post subject: Re: Ryzen 2700X idle power consumption
PostPosted: Wed Aug 29, 2018 10:55 am 
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Joined: Sat Aug 24, 2002 10:24 pm
Posts: 22
Location: San Francisco
In the original TomsHardware review of the 1950X, the author noted the power consumption numbers reflected the memory speed set to 3200. This accounts for the 15w difference - the AnandTech review also shows this.


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 Post subject: Re: Ryzen 2700X idle power consumption
PostPosted: Wed Aug 29, 2018 8:52 pm 
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Joined: Wed Feb 26, 2014 5:07 am
Posts: 9
I see, thx!


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