I'm contemplating replacing my Pi 3 + StellarMate with a 4. Will plate solving, etc. function OK with 1 GB or am I better off with 2 or even 4? The 3 takes a long time to plate solve and often fails, so I have to use my laptop and suffer the download times.
I would recommend the 4GB model simply because it doesn't cost that much more and you never know when the extra ram can come in handy. But 2GB works, and already a very worthwhile step up from the Pi3 with only 1GB.
INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
Yep, to be fair, my advice was to get the 2GB version since that's all you should need memory-wise. However, I myself instead opted for the 4GB version, just because it was just a little more money. So you can do what I said or do what I did
I've never seen mine go over 2GB's more like 1.3GB's. I think if I had to buy a backup version it would be a 2GB version. But as Ihoujin said, it's not that much more. But you never know, someday they might open up that memory usage.
I wonder what will happen when (if) they go to 64bit vs the current 32bit. That might have nothing to do with memory usage though.
OK, that's pretty clear guidance. It wasn't just the dollar cost I was thinking of, but also potential power consumption and heat generation. That might be significant on a less-sophisticated board computer where the RAM is a bigger part of the budget for both, but thinking about what the Pi 4 is already packing, I bet the extra RAM 's power and heat is down in the noise.