Raspberry Pi 4 looks interesting.

[Bromf]

Havn't really tried mine yet. Tried to power up with the existing microSD card and it doesn't work (will figure that out later)

Change of underlying version from Raspbian Stretch to Buster.....  you'll need to rebuild. Stretch is not compatible with the new cpu in the Pi4

My thoughts so far are...
1) having separate Network and Usb busses makes a big difference.... on webradio I've yet to experience any dropouts or loss of connectivity.
2) fan cooling is a must....there are plenty of options though my cheap hack seems to work fine...and quiet too.
a 90' header for HAT to leave the Pi open for cooling...
https://www.ebay.com/itm/2PCS-2-54mm-Dou...SwxKtYBM9r
a fan.... plenty of USB fans for pennies... mine was from a yard sale...new in a box for .50c
https://www.amazon.com/iKross-Mini-Deskt...4TK1Z1F83A
a way to make it silent... [Image: smile.png] 
https://www.ebay.com/itm/Mini-Micro-USB-...3614116176
With the controller wound almost down the fan gives an inaudible gentle breeze across the Pi4 and monitoring temps it has dropped from idling at 56' without the fan to playing at 35' for several hours with the fan.
Now that it works I will put it all in a box and dispense with the cage/mount around the fan.

https://www.cyberciti.biz/faq/linux-find...e-command/

I am powering the fan with a 5v wallwart and not via the Pi...;-)

3) Power supply for a Pi3 works fine provided no large draws on the usb lines ...so no powered drives or devices that total more than 500mA... otherwise use a powered usb hub.

Boards have just arrived for the Salas L-adapter.... what a beast!   I ordered 2, one for the Pi4 and another for the HP Thinclient so both smps' will be replaced with linear supplies.
https://www.diyaudio.com/forums/power-su...apter.html