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by alias_neo
Fri May 08, 2020 11:27 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

I am curious, what does the Pi network do? At the moment, nothing, but I'm a software engineer, I'm planning to use it to test and deploy "serverless functions" for ARM. Overkill? Obviously not a fan Of Binford Tools :) I could probably give most things I build a Binford model number, I also don't ...
by alias_neo
Mon May 04, 2020 7:17 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

Indeed. This is the way. :lol: I tested the difference in lowering network speed to 100Mb, that dropped the temps a couple of degrees. Certainly a nice way to lower temps if network bandwidth isn't key, but my workload is network heavy so I won't be doing that. As it stands, the top is on now, the E...
by alias_neo
Fri Apr 24, 2020 10:18 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

the ethernet caused high temps at the release date, it all in that SoC not an external chip. they're power hungry things Gigabit ethernet. it also made the Pi3B+ power hungry with it enabled compared to its older version. if you don't need more than 100mbps commection, ramp it down from 1000mbps. s...
by alias_neo
Fri Apr 24, 2020 10:08 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

Latest results https://raw.githubusercontent.com/2bytes/website/dev/static/images/external/rack-pis-temps-ov_6_5_4_3-ethernet-disconnect.png The dotted lines correspond to the following events (the graph starts at stock); cpu_freq=2000 and overvolt=6 cpu_freq=2000 and overvolt=5 cpu_freq=2000 and ov...
by alias_neo
Thu Apr 23, 2020 4:28 pm
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

I assume so as it was mentioned in the first post the check is, sudo rpi-eeprom-update BCM2711 detected BOOTLOADER: up-to-date CURRENT: Tue 10 Sep 10:41:50 UTC 2019 (1568112110) LATEST: Tue 10 Sep 10:41:50 UTC 2019 (1568112110) FW DIR: /lib/firmware/raspberrypi/bootloader/critical VL805: up-to-date...
by alias_neo
Thu Apr 23, 2020 3:08 pm
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

not bad and it's not even sweating at 2GHz. Yeah those 2GHz temps are quite impressive. I'm going to lower the overvolt slowly and let it settle for some time in between so we can see where we get! Does this variation happen if you run the fully supported by RPT / RPF Raspbian Buster fully updated ...
by alias_neo
Thu Apr 23, 2020 12:47 pm
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

bensimmo wrote:
Thu Apr 23, 2020 12:41 pm
not bad and it's not even sweating at 2GHz.
Yeah those 2GHz temps are quite impressive. I'm going to lower the overvolt slowly and let it settle for some time in between so we can see where we get!
by alias_neo
Thu Apr 23, 2020 12:34 pm
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

So I overclocked them as suggested, and left overvolt at 6 while I went out for a run, here's the result, the gap is a bit larger now;

Image
by alias_neo
Thu Apr 23, 2020 10:04 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

Have you tried measuring temperature with an external monitor? like an infrared one or a contact one? It could be useful to detect differences in calibration between internal temp sensors. infrared ones should be sensitive enough to detect 2 degrees baseline differences maybe there are even more pr...
by alias_neo
Thu Apr 23, 2020 9:45 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

just take two degrees from your measurement, the graphs will now align. Much cheaper than buying other Pi4. and forget about it. (what happens if you run them all at 2GHz?) Haha, I'd only be lying to myself :D How would I go about running them at 2GHz? Is that a warranty bit flipper, or is somethin...
by alias_neo
Thu Apr 23, 2020 9:29 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

RPis bought at the same time from the same supplier does not mean that their CPU/GPU chips came from the same silicon wafer. There are variations. Also the temperature sensors are not individually calibrated. IMHO a difference of 2 degrees is nothing to get excited about. I appreciate that the dies...
by alias_neo
Thu Apr 23, 2020 8:44 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

I'd guess the SoC dies came from different wafers. There is always some variation. I suspected as much, but ~2 degrees seems like a large variation. If you think this is within margins I'll just forget about it and move on :lol: EDIT: and by forget it and move on, I mean I'll buy a bunch more Pi4s ...
by alias_neo
Thu Apr 23, 2020 8:42 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

I see you've installed heatsinks, are they all from the same supplier? Some of those cheap stick on heatsinks work better as an insulator instead of a thermal transfer, maybe it's that? Indeed, I ordered them together as a set, as with everything with this build to try and control variation. The he...
by alias_neo
Thu Apr 23, 2020 8:21 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

Hah, no problem, I need to get some coffee myself!
by alias_neo
Thu Apr 23, 2020 7:09 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

what happens if you move them physically round in the case ? [thermal differences can be mft tolerances ] I noted in the first post, physically swapping the first and third Pi's locations made no change in the temperatures. Their location in the case way my first assumption. The case has also been ...
by alias_neo
Thu Apr 23, 2020 6:56 am
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Re: Thermal differences between mutiple Pi 4B units

Ah yes, I did miss that point! Updates are a way of life (I run Linux everywhere), so I forgot to point that out. All three Pi's are running Ubuntu Server 18.04.4, 64-bit, and all are fully up to date. They were imaged at the same time, and had only their hostnames configured differently. Any and al...
by alias_neo
Wed Apr 22, 2020 8:20 pm
Forum: Advanced users
Topic: Thermal differences between mutiple Pi 4B units
Replies: 37
Views: 2414

Thermal differences between mutiple Pi 4B units

Hi all, I've been building a little Pi network in a box for the past couple of weeks. 3x Pi 4B 4GB in a rack mountable case, I drilled and fitted standoffs and then cut holes for the ethernet ports into the front; https://raw.githubusercontent.com/2bytes/website/dev/static/images/external/rack-pis-c...
by alias_neo
Fri Sep 14, 2018 6:18 pm
Forum: HATs and other add-ons
Topic: PoE HAT - USB Ports not working - over-current (FIXED - New Hardware Release)
Replies: 327
Views: 109382

Re: PoE HAT - USB Ports not working - over-current

I have seen an interesting issue that no one here seems to have mentioned thus far. I had two HATs with apparently distant batch numbers. I connected them to my Ubiquiti PoE switch with a ~30cm ethernet cable (amongst others, for testing) and yes they exhibited the USB issues. Both with and without ...
by alias_neo
Thu Jul 17, 2014 8:27 am
Forum: General discussion
Topic: Who's got their hands on a B+ so far?
Replies: 119
Views: 26849

Re: Who's got their hands on a B+ so far?

Finally got high current mode to work on my Pi. I had to use the "old" style gpio safe mode flag even though I'm running the latest firmware. For some reason my config.txt is getting wiped on a reboot, and if I try to modify it from the running Pi I get an I/O error on save. I'm hoping it's just a d...
by alias_neo
Wed Jul 16, 2014 4:17 pm
Forum: General discussion
Topic: Who's got their hands on a B+ so far?
Replies: 119
Views: 26849

Re: Who's got their hands on a B+ so far?

The one I ordered via CPC Farnell "after lunch" on Monday arrived in the post today. Fitted some nylon pillars into the mounting holes (in lieu of a case). Used GParted (on my Ubuntu netbook) to reformat etc. a 16Gb Samsung uSDHC, downloaded NOOBS 1.3.9 lite and unzipped it to the card. Plugged eve...
by alias_neo
Wed Jul 16, 2014 11:13 am
Forum: General discussion
Topic: Who's got their hands on a B+ so far?
Replies: 119
Views: 26849

Re: Who's got their hands on a B+ so far?

Aha. So that's how we get the extra current. I managed to get a freebie from Element 14 at Tower Bridge, took it straight home to see if I could ditch the spliced cable and powered hub I'm using for the B, but alas it would not run my 2.5" HDD. I'll go straight home tonight and add the max_usb_curre...
by alias_neo
Mon Jul 14, 2014 8:13 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Pi B+ ID_SD and ID_SC
Replies: 6
Views: 20204

Re: Pi B+ ID_SD and ID_SC

If this is correct, it's going to be great, the pi will be able to swap drivers and pin settings by identifying the board attached through its ID chip. This should allow the GPIO to detect which device has been attached like a USB port does. I'm hoping this will happen very early in the boot process...
by alias_neo
Fri Nov 08, 2013 4:49 pm
Forum: Wanted
Topic: WI-FI USB Needed
Replies: 3
Views: 2259

Re: WI-FI USB Needed

This seems popular with Pis. http://www.amazon.com/Edimax-EW-7811Un-Wireless-Adapter-Wizard/dp/B003MTTJOY/ref=pd_sim_pc_2 I use this one. It works very well, speeds are fine, I can't vouch for range because I have a router within 2 metres of it but importantly it's pretty low power too. If range is...
by alias_neo
Tue Jun 11, 2013 3:21 pm
Forum: Teaching and learning resources
Topic: Python and SQLite databases
Replies: 3
Views: 5487

Re: Python and SQLite databases

Hey, I've just come across your post after doing a quick google for "raspberry pi python database". It saddens me to see this has been here so long unanswered when you've clearly gone through some effort to put this together, and then make it freely available. I'm not sure how to access the PiStore ...
by alias_neo
Sat Feb 02, 2013 12:44 pm
Forum: Gaming
Topic: Raspberry Pi Battery Powered Portable Hand Held MAME Console
Replies: 8
Views: 3933

Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

I suppose you get what you pay for, since the switching mode regulator is almost 7 pounds, as opposed to the sub-pound price of the 7805. What's the display like? I was considering one for showing some stats on, but I imagine the S-Video only connections mean sharpness is unlikely. I've been unable ...

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