https://www.raspberrypi.org/documentation/hardware/raspberry...
"The Pi4B has a dedicated SD card socket which suports 1.8V, DDR50 mode (at a peak bandwidth of 50 Megabytes / sec). In addition, a legacy SDIO interface is available on the GPIO pins."
Doubled, so I guess around 40 MB/s. Still a far cry from fastest SD cards that can both read and write over 250 MB/s. Hopefully RPi4+ will improve on this. :-)
<captainpickardfacepalm.gif>
I'm very happy for RPi4 SD improvements. Until now, RPi has had same lacking ~20 MB/s SD performance from the start. AFAIK, this is the first time ever there's been any hardware improvement in this regard.
I've had a microsdxc card with 90 MB/s reads and 80 MB/s writes since early 2014. Some current cards can read & write more than 250 MB/s, so there's still room for improvement.
As 95-99% of all RPis boot from (micro) SD and use it as primary storage, I'd say SD performance is a rather fundamental (often ignored) aspect of RPi performance.
Of course you can. My tongue was very much in cheek :)
...but still, it was announced today, savour the moment :P
"Support for these additional bootmodes will be added in the future via optional bootloader updates. The current schedule is to release PXE boot first, then USB boot."
https://www.raspberrypi.org/documentation/hardware/raspberry...
Is there any improvement in this? It's pretty important as RPi usually boots off it.