Gaming Server Build help

So I am finally upgrading from 1.3 mbps to full gig fiber thanks to a local company!!!! Long story short I am looking to now build a server to host a Minecraft server for my son and maybe me.... Plus a Ventrillo server and a gmod server simultaneously. Plus once in a while a random game server to have fun in. There will only be somewhere between 20-35 people on at one time. My current computer I was using as a server is choking way too much it starts to lag when someone lays down too much TNT or a object gets stuck inside the map in gmod then the whole computer crashes and reboots. So if anyone can help with suggestions on parts lists anything it would be awesome :D thanks :D

Someone putting down too much TNT will always be an issue ;)

that said, a Xeon E3-1240 V2 for example should pack a decent punch for you without costing too much and don't plan to run any GUI stuff on it(eg. windows) if you do, go for it's slightly bigger brother Xeon E3-1245 V2

For a motherboard the Supermicro X9SAE isn't awefully expensive either and supports up to 32GB of ram which is more than you'll need for your application.

For memory: pick your poison, no need for ECC unless you're nuts or loaded, I'd say 16Gb should be sufficient for the outlined use, but you have room to go to 32 with the motherboard and cpu mentioned.

the motherboard is standard ATX so pick your poison for a case as well, as long as it can hold a regular desktop, it can hold those components, Supermicro got cases optimized for the mentioned motherboard: SC733 and SC732, these include PSUs that should be sufficient for this build(500W should be pretty op).

I'd say 1 ssd for os, 60-150GB in size, or if you want some safety, get 2 250GB ones and put them in raid (motherboard has a simple raid controller on it), or use ZFS or btrfs with mirroring(I'd do this).

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I host my own teamspeak server and minecraft server, so I'll try to help as much as possible.

Currently I am trying to run ProxMox and make each server its own vitual machine, better management/control/cuz i can.

but before that i used to just run it all under one user ie log in as user and run the minecraft server and teamspeak server. my server is an i7 870 with 16GB of ram and a 1TB WD red drive. used to be running CentOS 6. Now is in transition to ProxMox.

Because of minecraft using java there will always be an issue of too much tnt, the best way to minimize this is get a very fast per core speed of a processor. with my setup it was only an issue if you say world editted like a big ass sphere of tnt, even then it wasn't too bad within reasons.

as for the gmod making virtual machine for that might be best that way if it crashes it doesnt crash the server just the VM holding gmod. so take what i am doing. physical server runs ProxMox, that runs virtual machines those virutal machines would hold an os and on that you would install gmod stuff the other virtual machine would hold the minecraft stuff and the next one would hold the vent stuff.

now it does take some learning to set all this up but once you learn it it would likly be the best since you wouldn't be crashing the whole server just that VM would crash.

If you do want to go the vurtual machine route 16GB might be enough i dont know how much gmod takes to run but my TS3 server looks like it will run on 512mb of ram(currently untested with users) so vent probly not much more, my minecraft server(s) will take up a lot of my ram currently setting the VM to 8GB thats for the Ubuntu server OS and to run the Minecraft server.

The parts thor said would work fine, the processor is faster then mine and i run minecraft with like 42 plugins a proxy server and a second skyblock server. now the more users you have the more ram you will need.

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Awesome thanks guys I will probably start the build as soon as possible :D