512 ram on a cpanel server is not much, but yes, increasing to 1 gig will help a lot. Look at your swap file. I like having enough ram so that no swap file is used. If your swap is 100meg or more (which most likely it is) then yes, increase the ram.
I have a few boxes over at Ev1 Servers, now Ev1 Servers-The Planet. They all came with 512MB RAM and I noticed that a specific one was actually crashing every few days.
I started monitoring it very intently and noticed that when SpamAssassin (spamd) runs, the server's load jumps way up and uses a lot of the RAM.
So in summary, I'd suggest maybe disabling SpamAssassin first, if your customers (or you) don't use it, or could live without it.
He's right - 512 is a small amount of RAM for a server. I'm running 1GB on most of my boxes and 4GB on another. Performance is not notably different between them.
PS: There are no dumb questions - Just questions that make us think back a year or two.
I started monitoring it very intently and noticed that when SpamAssassin (spamd) runs, the server's load jumps way up and uses a lot of the RAM.
So in summary, I'd suggest maybe disabling SpamAssassin first, if your customers (or you) don't use it, or could live without it.
He's right - 512 is a small amount of RAM for a server. I'm running 1GB on most of my boxes and 4GB on another. Performance is not notably different between them.
PS: There are no dumb questions - Just questions that make us think back a year or two.
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Until around September time, most of our servers had 1 to 2Gb of RAM, but due to the increase in spam (and hence processing time/requirements), we had to upgrade all servers to 4Gb to prevent slowdowns when we received a lot of inbound spam (at one point, over 2,000 emails per hour with 80% being marked as spam via MailScanner). As per usual - the more memory and CPU resources you can through at a server, the better 
(oh, and in regards the dumb question - I don't mind them from anybody as long as the question asker provides details, shows they've tried to resolve/investigated/searched the issue and have got confused. I do, however, like many people probably on this board hate the "Help! I need help now! (no other information)" style ones or ones that don't contain error messages etc. We're a reasonable helpful and friendly bunch here, and ask long as you help us help you, they'll be no problems of any questions :D )
(oh, and in regards the dumb question - I don't mind them from anybody as long as the question asker provides details, shows they've tried to resolve/investigated/searched the issue and have got confused. I do, however, like many people probably on this board hate the "Help! I need help now! (no other information)" style ones or ones that don't contain error messages etc. We're a reasonable helpful and friendly bunch here, and ask long as you help us help you, they'll be no problems of any questions :D )
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