What is the -Xmx750m?
Can we increase it if we have more RAM?
Xmx sets the max size of memory for the miner. This was put there to keep it from unnecessarily wasting ram.
What is the -Xmx750m?
Can we increase it if we have more RAM?
Yes, physically 750m is as stated, 750mb of ram reserved, it means that java virtual manager is able to use 750mb, it doesent use it all, it just reverses it so it can write as it pleases.
on a secondary note, who sent me 2k worth of burst ?
thank you whomever it was

That was me. Donation for the guide which I linked to from the op, and I'm hoping will save me a bit of time replying to people having setup issues.