Subj : Re: Pi 5 and NVMe SSD To : Pancho From : Chris Townley Date : Thu May 23 2024 12:28:10 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 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 --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .