hello vpsboard may I ask if how can this be true?
https://lowendbox.com/blog/yes-you-can-run-18-static-sites-on-a-64mb-link-1-vps/ and I inspect the site and he is using Xen 64mb dedicated ram . Does it mean my VPS with 512mb ram (KVM) is having more ram than what he have on the article? is dedicated ram more powerful than just a ram ?
There are three "types" of RAM with VPS allocations.
Dedicated RAM is JUST that, RAM that you can use
whenever/however you like. A VPS containing 1GB of dedicated RAM means
you can have up to 1GB of usage with no "slow down" (assuming you're not trying to use more RAM, CPU is fine, and etc)
Burstable RAM is a "grey" area of RAM allocation as it hard to estimate just how much of this is at your "disposal". BASICALLY the VPS provider set up a separate "pool" of RAM just for this purpose. Then whenever the
machine is underloaded this pool may be "drained" by ALL the VPSes on it. BUT not only it is
shared among other VPSes you will also be limited by it. For example a VPS that have 1GB RAM and 2GB Burstable means you have 1GB "rain or shine" and 2GB "
at best".
The last one is
not located at RAM at all but somewhat confused referred as "SWAP" or "Paged"
RAM. These allocations are basically
a LOT slower (Even if decent SSDs are used for these allocations) than "native" RAM. Nothing "bad"
having a bit of this at your disposal as some processes can "offload" to this and still operate just fine. However some CRAP provider saying you get 256MB RAM and 8GB of "SWAP/Paged
RAM" is
not going to get you any real "mileages".
The "short version" is try to stay away from Burstable and spend your good money on dedicated RAM.