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If you are going to host a game server you first need to choose AMD or INTEL.
The Amd server processor is usually faster than the Intel server processor but Intel is more compatible with older games and programs and they also have the Intel Xeon processor which is perfect when hosting a server and very stable server processor and is used for servers on many companies just because it is so very stable.
However the Amd´s better performance is also a benefit for your server when you choose.
When you host a server you must buy a server that is best for your server needs.
If you are going to host a Mmorpg game server with a lot of players you might need to buy a powerful server with Amd Athlon X2 dual core or a Intel Core 2 Duo Processor, Intel Xeon dual core or a Intel Itanium if you can afford it, at least 2gb of ram and two fast SATA hard drives, one for your operating system for the server and one for just the game server application.
If you are hosting a Fps game server then we recommend you to buy a server with Intel Xeon processor or Intel Itanium or a Amd Opteron processor with at least 1gb of ram and a fast SATA hard drive for your server.
You can also buy a server with Intel Core 2 Duo Processor, Intel Xeon dual core or a Amd Athlon X2 dual core processor if you are planning to host several game servers on one server.
If you are just going to play games and not host any server then we recommend you to buy the Amd processor for maximum performance with at least 1 GB of ram and make sure you buy a good graphic card since it is the most important component for games.