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by Endgame
Fri Jul 10, 2020 2:31 pm
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

I picked up a power meter (this one to be specific: https://poniie.com/products/17), and after playing with it a little bit, I have these observations. 1) Anker customer service stated its 6 port, 60 watt power supply is 85% efficient at any load. This appears to be incorrect. 1 pi 4 4GB attached to...
by Endgame
Thu Jul 02, 2020 1:19 am
Forum: General discussion
Topic: Overclocking past 2.147GHz on the Pi4
Replies: 16
Views: 1148

Re: Overclocking past 2.147GHz on the Pi4

Is there much use in going past 2.147ghz? Across 8 pi 4s, I have none that are stable 24x7 at 100% cpu running boinc load, even at over_volt 6, with heatsink + 120mm fan blowing on the pi. Are people having good luck at 2,147 on less stressful loads?
by Endgame
Thu Jul 02, 2020 12:22 am
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

What would be truly awesome would be the Official raspberry pi foundation listing of the idle and active power draw of every controllable component on the pi. You could do this yourself now if you wanted. Look up the data sheet for the various components, that data should be included. I’m still not...
by Endgame
Wed Jul 01, 2020 7:23 pm
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

Interesting that this thread popped up once more. Anybody been looking into proper (passive) cooling the CPU, PMIC, USB ? Temperature also has an impact on power consumption. I am not sure though what magnitude we're talking about. What level of passive cooling are you looking for? I’ve done some t...
by Endgame
Wed Jul 01, 2020 7:13 pm
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

I appreciate the power-saving information in this thread. What I'm wondering is, after all the lights, WiFi, HDMI and so forth have been turned off but not wired Ethernet, then what is the current draw when running cpuburn? https://github.com/ssvb/cpuburn-arm/blob/master/cpuburn-a53.S This is some ...
by Endgame
Wed Jul 01, 2020 3:25 am
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

Is it redundant to set max_framebuffers=0 and comment out dtoverlay=vc4-fkms-v3d, and then run tvservice -off?

I was Originally assuming that power and every possible feature / configuration tied to hdmi is disabled with tvservice -off, but reading the doc has me less sure of that now.
by Endgame
Wed Jul 01, 2020 12:58 am
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

Minor update. I used ethtool to force the ethernet connection to 100mb instead of 1gbit. It saved 2 watts across 8 pis (approximately .25w per pi). Compared to some of the other changes I've made, it's actually a fairly decent power savings. I'll have to mull it over and decide if .25w is worth a 10...
by Endgame
Wed Jul 01, 2020 12:07 am
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

Speaking of running without SD cards, is there a way to power off the SD card reader? No. The SD card uses 3.3v which it gets from the PMIC which needs 5v input so it can generate the 3v3 You cannot reverse that functionality I think that's "power off" as in turn off, remove power. Not "power off" ...
by Endgame
Tue Jun 30, 2020 9:58 pm
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

lock ethernet to a max of 100mbps since a gigabit connection is power hungry. or at least was. a lot of the ethernet info was in the initial Pi4 release threads as they debugged an swirled out why the thing was very hot. first thing that came to my mind. I’ll check it out - is this best done via et...
by Endgame
Tue Jun 30, 2020 7:28 pm
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 191
Views: 11825

Re: Get your Pi to fight COVID-19

I’m running 8 pi 4s: 1x 8gb in Flirc case 5x 4gb w/ 4gb zram configured in Flirc cases 2x 2GB with 2GB zram configured w/ small ram sink Average per consumption per pi is 4.5 w with 100% cpu load. All pis will run with over_voltage=-2 and arm_freq=1525, and average approx 1100 Rac in Rosetta at that...
by Endgame
Mon Jun 29, 2020 9:53 pm
Forum: General discussion
Topic: One PSU for all
Replies: 20
Views: 1046

Re: One PSU for all

I can second the Anker 6 port 60 watt supply. 85% efficient according to Anker and I’m happily running 6x pi 4s at 100% cpu (boinc) on it with no problem.

What would be really awesome is a 80+ titanium power supply with 50+ usb c connectors. A whole pi cluster off of one psu.
by Endgame
Mon Jun 29, 2020 6:15 pm
Forum: Advanced users
Topic: RPi4 - Power Savings
Replies: 60
Views: 16321

Re: RPi4 - Power Savings

Hello all, This thread is a little old, but it’s exactly what I was looking for. If I should start a new thread, let me know. That said, has any additional progress been made on shaving power off the pi 4? My use case is slightly different, as I’m not running off of battery or idle, but currently ru...

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