Orange Pi has a little hanging WiFi Antenna underneath. Try to move it a bit or expose it outside slightly if you can. That may improve signal.
Quality of SD card does not matter, as long as it reads and writes without error and capacity is not faked. Mining process does not require any storage access. If your old SD card burns out, you can just replace it with a new one in 20 minutes by flashing image and popping new card in.
Thanks!
I was wondering what that dangling thing covered in shrinkwrap is, now I know!
Regarding the SD card, I was wondering if I could use the Apollo as a computer behind my TV to play youtube etc via HDMI cable.
Do the SD card specs matter for that sort of thing?
As in: Having 3 or 4 Firefox tabs open and try to watch Youtube in one of them. It did not seem to work very well with HDMI TV and with the replacement SD card that I use now, but an earlier attempt while connected to a monitor via HDMI cable - and with the original SD card in it - worked a bit better.
Streaming video online does not use any storage I/O, so it should work nicely even with slow SD card.
Orange Pi is a quad core SoC, it should handle watching videos on YT, maybe in Full HD 60 FPS even.