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Raspberry Pi 5

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Re: Raspberry Pi 5

#281

Post by Goz3rr »

dheera wrote: post #207
isoprophlex wrote: post #6

I'm happy that they're upgrading the pi, but it's not exactly lightweight computing in terms of power (they recommend a 27W PSU) or performance/watt (see: your cell phone) To me the charm of the raspi ecosystem was always in giving you a very low power, "always on, almost no power draw" linux environment. Oh well, I guess there's always the older versions or the zero for that.

The worst part about it is they require a nonstandard, USB-C standard-violating proprietary power brick that does 5V5A. None of your 100W Anker or Apple power bricks will supply this. They'll do 12V3A, 12V5A, 20V5A, but not 5V5A. Yet another piece of nonstandard USB-C equipment.

I pulled up the actual USB power delivery standard[1] USB_PD_R3_1 V1.8 2023-04.pdf, and 5V 5A is perfectly compliant, albeit optional.

On page 805 you find Table 10-2 SPR Normative Voltages and Minimum Currents, which specifies that a USB PD source with a rating of 15 [1]: https://www.usb.org/document-library/usb-power-delivery

Re: Raspberry Pi 5

#282

Post by rewmie »

tm-guimaraes wrote: post #254
FirmwareBurner wrote: post #226

Earlier quoted context omitted.

[flagged]

RaspberryPis are a physical good, those have production limitations. They are also quite cheap, sell well, and have kept prices. It’s quite different from a lootbox that has no production restriction (replication is instant and almost free) I don’t believe that the low supply of RPIs is an attempt to extract huge profits, logistics are not easy. This magazine move seems more of an honest way to prioritizing people th…

> RaspberryPis are a physical good, those have production limitations. They are also quite cheap, sell well, and have kept prices.

I'm not sure they kept prices. $60 for a 4GB board sounds like a price increase compared to the $50 RPi4 4GB model. And didn't the RPi model A sold for around $25?

Re: Raspberry Pi 5

#283

Post by mytailorisrich »

peteforde wrote: post #274
mytailorisrich wrote: post #268

Earlier quoted context omitted.

At some point, and considering how cheap they are these days, the simplest option is to add a GPS module if your use-case allows for satellites in decent view.

Does this work inside? How cheap is cheap?

> Does this work inside

It depends. Hence my previous comment.

> How cheap is cheap?

Google says unit retail price for module with PPS output can be under $5.

Re: Raspberry Pi 5

#284

Post by qhwudbebd »

osti wrote: post #265

Amazing benchmark results https://www.phoronix.com/review/raspberry-pi-5-benchmarks

I was going to post to ask how it was likely to compare with the current crop of RK3588 boards that are marching towards decent mainline support, but this link already answers this to some extent. It looks like it's faster on some benchmarks, slower on others, but basically in a similar ballpark?

Re: Raspberry Pi 5

#285

Post by Goz3rr »

peteforde wrote: post #253
xorcist wrote: post #248

Earlier quoted context omitted.

What's with the patching? It sounds like pretty much spot on for what NTP was designed for. Each clock is monotonically increasing, with its individual drift. NTP will pretty soon find out exactly what the right polling interval is. Even if you run it in broadcast mode (why would you though, with only 70 devices).

It's been eight years, but if memory serves, the primary need was to force it to broadcast as frequently as possible. Everything you said is totally legit unless you're addressing devices with software clocks that are running at speeds dictated by subtly shifting voltage. Remember, according to the Pi itself, it's 100% in sync. No problem hereeeeeeee (robot voice as voltage dips to 4.9887 volts).

If you were already going through all that effort, what was the reason behind not just adding a $2 RTC to the i2c header of each Pi?

Re: Raspberry Pi 5

#286

Post by ndsipa_pomu »

rewmie wrote: post #237
markonen wrote: post #186

Earlier quoted context omitted.

The idea that even 10-20% of users would power their Pis with PoE seems wild to me. Seems like a much smaller niche to me (even though I'm one of those people). Anyway, I have been wondering whether a headless-oriented SKU wouldn't make sense. Pay for the PoE BOM by jettisoning the video output.

> The idea that even 10-20% of users would power their Pis with PoE seems wild to me. Seems like a much smaller niche to me (even though I'm one of those people). I'd be surprised if the majority of RPi's userbase didn't used PoE. Having to cart around a power supply isn't a very attractive option when all you have to do to power the device is simply plugging in a yank-proof RJ45 cable. It's also cheaper as you don't…

I've contemplated trying PoE for powering RPis, but just the HAT alone is more than the official power supply, so it's hardly cheaper and that's not even figuring in the extra cost of PoE network equipment.

Re: Raspberry Pi 5

#287

Post by ChickeNES »

JD557 wrote: post #278

From what I can tell, this is the first version without a composite video output, correct? It's a bit of a shame. What are the alternatives for someone who needs a computer connected to an old CRT TV? Are there other boards with composite video or does one need to get a HDMI->composite converter?

no connector, but the signal is on the board with solder pads

Re: Raspberry Pi 5

#288

Post by Matsta »

TheMode wrote: post #271
futureshock wrote: post #206

I think it’s notable that the chip powering the RP5 is built on a 16nm process. (The RP4 was on 26nm). This is a nearly 10 year old manufacturing process and it’s silly to compare the performance per watt to any Intel or Arm chip on the market today. On such an old node, it’s not surprising that the power draw is so high. Of course an M2 would smoke a RP5 at a much lower power. But the RP5 is 60 bucks!

Is there any high end 5/7nm SBC? Phone chips don't seem to escape the phone market.

Rockchip's rk3588 is on 8nm: https://www.cnx-software.com/2021/12/16/rockchip-rk3588-data...

Re: Raspberry Pi 5

#289

Post by birracerveza »

This seems promising, hopefully it's not literal hot garbage like the 4.

I loved the 3, but the 4 overheated even after patching it and using a dissipator for basically every workload...

Re: Raspberry Pi 5

#290

Post by m463 »

mrweasel wrote: post #216
markonen wrote: post #186

Earlier quoted context omitted.

The idea that even 10-20% of users would power their Pis with PoE seems wild to me. Seems like a much smaller niche to me (even though I'm one of those people). Anyway, I have been wondering whether a headless-oriented SKU wouldn't make sense. Pay for the PoE BOM by jettisoning the video output.

I'm really surprised that PoE isn't more prevalent that is currently the case, but I guess it's because most people prefer WiFi devices. I'd add network jacks to everything and remove the power plugs if the option was presented. Most "normal" people seem to be the other way around. "Wireless" speakers (they'd be networks speakers then) / home assistant devices / media players and whatever else should always be attach…

I think real POE is kind of heavyweight. It uses higher voltage like 37-57 volts and the pi poe hats I've seen usually have fans.

I've used "informal" poe where you have a cheap injector/splitter that puts a nonstandard lower voltage over the ethernet.

https://www.amazon.com/dp/B00NRHNPUA

but real poe is getting more popular, poe switches are becoming available and maybe the hat is worth it.

There are also middle-of-the-road solutions:

https://www.amazon.com/dp/B07TJ3ZNJ4

basically poe splitter that has a usb-c power out for the pi

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