Thank you - that's handy to know. It seems logical that they would make it that way - but just wanted to check there's no risk of it wiping the drives in some reformat operation. Now, just need to pick new hardware!
Yes, I was thinking of going off such a list: https://www.asrock.com/mb/AMD/X399 Taichi/index.us.asp#Memory
My old system only had 8GB - which was enough for the odd docker, running Plex (just streaming SD content; backups of DVDs) and occasionally running a Win10 VM.
Now, with a view to editing UHD video getting much more memory is on the cards. I'm thinking quantity over raw speed though, perhaps somewhere in the middle. Most MB/CPU reviews seem to use 3200Mhz RAM for benchmarking systems. Main factor in making a decision will be budget though - RAM is so much more expensive than when I got my last system!
Based on the list above, the GSkill F4-3200C14D-16GFX (2x8GB) kit seems affordable - 2x of those works out at about $660 AUD. Also leaves a few slots to double that later when RAM becomes a bit more affordable. Thoughts?
As for multiple GPUs, I think a single 1080Ti is more than enough for video editing. However, I will need a cheaper one for unRaid itself. Not sure what to get for that. Main criteria is that it is compatible I guess. Ideally, I'd like to continue to use unRaid headless (I just SSHed in or used the web interface). I can add another 1080Ti later I suppose.
Cheers,
Xav.