Altos G540 - System Specs

Hi There,

I have recently acquired an Acer Altos G450, and while I understand this is an older server, I need some information on how far I can upgrade this machine.

I haven't decided what I am doing with this machine yet, but I am thinking of using it as a PLEX server.

Can anyone answer the following questions?

1. What is the Maximum RAM ammount and type I can install into this machine?
2. What type of Video card can I install into this machine without any issue? Again, prefer the best possible.
3. Is there a CPU list for this machine?
4. What is the part number for the Fan used on the second CPU? Will any 775 fan fit across the CPU socket?
5. Will a standard version of Windows 7 or 10 run without issue?

Kind Regards