Would I need to expand RAM?
And do you know how much for LiteCoin?
I'm making an assumption as to what you're paying for your VPS based on what I pay for my VPS with semi-similar specifications.
Mining litecoin? 6.72 $/month.
Take a look see here for bitcoin:
https://en.bitcoin.it/wiki/Mining_hardware_comparison
--> You might get like 50 MH/s, but most likely only see something like 10 MH/s
-----> http://www.alloscomp.com/bitcoin/calculator says you'll earn like $0.06 a month.
And here for Litecoin:
https://litecoin.info/Mining_hardware_comparison
--> You might get like 93 kH/s,
-----> http://litecoinminingcalculator.com/index.php?khs=90&diff=3998.22171415&cdiff=3998.22171415&fee=0 says you might get like 0.69 LTC a month.
More RAM isn't going to help. If you want to mine LTC (Scrypt coins) you need AMD GPU's. If you want to mine BTC you're going to need ASICs.