Jeff Geerling rundown: https://www.youtube.com/watch?v=nBtOEmUqASQ
[flagged]
You've gotta back up claims like that with at least some kind of citation or it just comes across like libel.
Raspberry Pi 5
771–780 of 1001 posts
Re: Raspberry Pi 5
#772No word on price. When Raspberry Pi first launched, this was the prime feature of the thing. Can we expect same price as the Raspberry Pi 4? (at the respective RAM level) Edit: found it here: https://www.raspberrypi.com/news/introducing-raspberry-pi-5/ So the 4 GB model is 60$, which is 5$ more than the 4 GB model of the Raspberry 4 when that was launched: https://www.raspberrypi.com/news/raspberry-pi-4-on-sale-now-.…
Not to mention it now requires a new PSU. Before you could use your standard $5 (android) phone charger at (5W), then you had to buy a 15W one and now a 27W. To whoever thinks pi's are cheap, you can get more functionality out of a used laptop for less money, but probably worse specs and probably x86.
The standard charger is 2.5W, not 5W, and RPi3 will happily run from that, for RPi4 2.5W is somewhat marginal, but it will still work. I suspect that RPi5 is going to be somewhere around 3W (non-PD USB3).
The official RPi specs intentionally overblow the power consumption in order to provide an buffer for powering whatever ridiculous stuff people may hang off the USB ports.
Then the other issue is that all RPis need somewhat tighter voltage tolerance than what is in USB specification. So it is perfectly possible that a cable between the power supply and RPi is compliant, but has too large series resistance on power lines for RPi. And well, powering RPi from random aliexpress-grade “Android chargers” is completely another bad idea.
Re: Raspberry Pi 5
#773Earlier quoted context omitted.
> If you must use average, then you should remove the top 5% from the average. 5% is too arbitrary, just use the median.
5% is not arbitrary. It is removing massively skewing outliers who also see a massive growth outlier compared to everyone else. Looking at wage movement as slices of where one falls gives a clearer picture. Additionally, the reason it doesn’t make sense to remove low wage outliers while removing high wage outliers for average is because the median wage is closer to low wage outliers than it is to high wage outliers.…
Why would you cut off a fixed percentage rather than use a standard deviation range?
Re: Raspberry Pi 5
#774Earlier quoted context omitted.
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
The problem here is that a power supply offering 5V 5A is compliant, but a device requiring a 5V 5A source is not.
If a device needs 25W it is required to accept 9V 2.8A, if it wants to be PD compliant. This is precisely because 5V 5A is optional for a 25W source, so a device cannot rely on it being present.
Re: Raspberry Pi 5
#775Earlier quoted context omitted.
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.
It’s worth noting that this is _allowed_ by the USB-PD spec, but you’re right that 5V @ 5A is not common because it is not required. At least it’s better than the Pi 4 was at launch? :D
The charger is allowed, the Pi 5 is not.
Re: Raspberry Pi 5
#776Earlier quoted context omitted.
It’s worth noting that this is _allowed_ by the USB-PD spec, but you’re right that 5V @ 5A is not common because it is not required. At least it’s better than the Pi 4 was at launch? :D
It would have been better if it could accept 12V3A which many USB-PD adapters can do. Or better yet just a XT30 connector and 5V5A.
12V is an optional voltage, a 25W device is supposed to use 9V 2.8A. Any USB-PD charger of 25W or more is guaranteed to provide that.
Re: Raspberry Pi 5
#777> PCIe 2.0 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter) This could make it appealing for a low-power server, like a home NAS. In previous models, disk I/O had to be over USB, which imposes more CPU load than native SATA, along with various unpleasant quirks typical of USB-to-SATA bridges. Too bad it's only one lane (assuming that's what they mean by x1), but I think that's almost eno…
PCIe 2.0 x1 can do 4Gbps, that should be more than plenty for any NAS - especially considering the ethernet port is 1Gbps.
Sure, but USB ethernet adapters exist, as do multi-disk servers.
Not bad for a simple setup, though, especially one aimed at conserving power. (Although this board's idle power draw remains to be seen.)
Re: Raspberry Pi 5
#778from the product brief:
"Raspberry Pi 5 will remain in production until at least January 2035"
LOL
Re: Raspberry Pi 5
#779Earlier quoted context omitted.
I think you can have over a hundred different i2c devices connected to the same bus, so it'd get pretty tall if you can power them all. 10-bit i2c (not very common) can do almost a thousand. Although, you'd need specific rules if you wanted to prevent someone just layering up always-on LED boards.
> you can have over a hundred different i2c devices connected to the same bus In theory sure, in a world with zero-inductance zero-capacitance busses and infinite-sink-current drivers. In our reality, however, you'll start having issues and start requiring stronger pullups and lower speeds long before you get to a hundred.
that doesn't change anything in this conversation, though.
one can still have lots of I2C devices on one bus if they can be given unique addresses.
Re: Raspberry Pi 5
#780Earlier quoted context omitted.
I asked Eben about that in an interview earlier this year, and the answer is "probably not too soon" — RISC-V has a lot of designs available, but most have been in the lower-end 'efficiency' class compared to cores like A76 (which the Pi 5 uses) and Neoverse, which are a lot faster. But tech progresses on... never say never.
A76-class RISC-V cores have been available to license since June 2021, and boards with them will be arriving in H1 next year.
That sounds really exciting! Do you happen to know if such boards will be competitive with the RPi5 eg quad-core etc. I love the idea of RISC-V resolving some of the drivers dilemma that SBCs seem to face. I recall some talk of extensions that might make it viable as a GPU core one day. Not to rain on the RPi5 parade of course, i'm sure it's a fantastic bit of kit :)