My rented (fragnet) server has 3gb's of RAM. I have not the slightest clue what this means for my server. (This is the only information they freely give on the server, I'm in the process of attempting to acquire more information.)
I'm interested in knowing what I can accomplish or allow on the server with this amount of ram. Information I'm interested in includes but isn't necessarily limited to, how many players can play at once before quality of gameplay is hindered, how many estimated chunks could be realistically loaded at one time before gameplay is hindered, what tasks or endeavors use what is considered 'large amounts of ram' and how much ram is considered a 'large amount'?
My server is running Feed The Beast, so please take this into consideration with your calculations and estimates.
Edit: Ok they have replied to my forum post, this is their exact reply;
All of our machines are equipped with enterprise-grade hardware from reliable brands. In the case of Minecraft server hosting machines, they are all running out of Intel Xeon E3 series of processors with high per-core performance (E3-1240v2 / E3-1270v2) which is optimal for running Minecraft servers. The RAM you pay for is entirely dedicated to your server, our machines are equipped with memory from Corsair, Crucial and Kingston.
Best Answer
3GB of RAM running heavily modded Minecraft... According to my personal experience with running servers and playing modded versions of Minecraft, I would say the server could support about 3-4 people at most with medium lag.