Refreshing my build after a long absense...

So for various health reasons my unRaid build hasn't been switched on for 2 years.....I've powered on, run parity and updated the software and all is good. Data is still safe. SMART reports are good if I'm reading them correctly.

Now what? Well, as you can see in my signature my build is rather lightweight. So I'd welcome some thoughts on what I should be thinking about (I'm aware I've got a ton of things to read up on and that's happening right now) - basically I'm trying to get some clarity on what I should be thinking about as I've jumped from 4.7 to version 6:

- Primary use case has been NAS storage and streaming media (highly unlikely to see more than one movie being streamed at a time). Existing media is streaming fine into Windows media player and the like and tested as working fine today. Would PLEX require additional horsepower?

- It's fairly easy for me to add in extra RAM. I've got a spare PC5300 1GB stick here already. How many issues would I run into given the RAM speed mis-match? I'm assuming some tweaks in the BIOS would be in order... Or would be it easier/smarter to just add in matching RAM?

Future use cases could see VM use. I'm wondering if I could deploy a hacking lab via a few VMs (similar to what I've got on a standalone laptop). But it's a lower priority I think at the moment. Regardless:

- I've also got 6GB of PC1600 DDR3 RAM (part of an i7-920 machine I've got that's no longer being used). Could this form part of an upgraded build? What would your suggested components look like?

- What about that i7-920? I suspect that's not the best option given that a) it's seen a lot of work already and b) it uses a fair bit of power. Not to mention that it's in a Gigabyte motherboard - which I recall used to cause some problems with unRaid due to the BIOS being stored on one of the HDDs.

There's probably loads of things I've not thought about, but this post is rambling enough! But I welcome any/all sensible thoughts.

MTIA