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From: Chris Townley <news@cct-net.co.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Pi 5 and NVMe SSD
Date: Thu, 23 May 2024 12:28:10 +0100
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On 23/05/2024 11:50, Pancho wrote:
> On 23/05/2024 10:58, The Natural Philosopher wrote:
>> On 23/05/2024 09:44, Pancho wrote:
>>> On 23/05/2024 09:03, Richard Kettlewell wrote:
>>>> The Natural Philosopher <tnp@invalid.invalid> writes:
>>>>> No problems with wimpy power supplies? apparently pi's and ssds take a
>>>>> lot of current at boot time
>>>>
>>>> It’s the official PSU.
>>>>
>>>
>>> I bought a Pi5 without the official PSU, or even a Pi4 official PSU. 
>>> It would run for a minute or two and then crash. Completely unusable. 
>>> It is now fine with the official PSU.
>> There is an entry in config.txt that 'tells' the pi that it has a high 
>> power power supply.
>> Otherwise it has to do an appl-ish sort of negotiation with its PSU to 
>> see if it is.
>>
> 
> No, I was talking about the USB standard. This is from memory, so take 
> with a pinch of salt.
> 
> I have high wattage USB C chargers for mobiles, pads etc. They quote 20 
> or 25 watts. Given I wasn't using any USB power draining devices, I 
> assumed this would be OK for the Pi 5.
> 
> However, it wasn't OK, Pi 5 crashed. When I looked at the USB small 
> print, the charger achieved a high wattage by boosting the voltage from 
> 5v to 20v, still using a relatively low amps. AIUI, this is USB standard.
> 
> However, the Pi requires 5v (maybe even 5.1v) and a high 5 amps. Which 
> is totally non-standard and makes the Pi 5 USB PSU effectively bespoke. 
> I suppose, but haven't tested, the Pi 5 PSU is also no good to fast 
> charge your mobile.
> 
> Presumably there is some good cost justification, but I don't like it. 
> The Orange Pi 5 is fine on a standard USB fast charger, but it is 
> generally lower power than the Raspberry Pi 5.
> 

5 Volts at 5 amps is within the USB power spec, albeit less commonly used.

-- 
Chris