LS cache on a VPS

[bettinz]

Hi all,
i've at the moment Listespeed VPS edition on a VPS with 1 core of 2,2Ghz 1GB of ram and about 15 sites.
I'm looking for a caching system, to improve and squeeze my VPS.
The question is: Does the enterprise edition with 2 CPU support and Cache (the only thing that I want) works on my VPS with 1 CPU and 1 GB of ram?
Does the litespeed cache works well on my vps with this CPU/RAM?

And the last question: I've read about private cache; I've 2 sites with Virtuemart and one with Magento. Do I need to manually set private cache for this ecommerce or is not a problem? For a shared hosting is impossible to know the script installed by every user and know the path for every private cache

Thanks