Recommended system requirements:

CPU: Intel Pentium D or AMD Athlon 64 (K8) 2.6 GHz or better

RAM: 4GB

Graphics Card: GeForce 2xx Series or AMD Radeon HD 5xxx Series (Excluding Integrated Chipsets)

OS: Windows XP or better, Mac OS 10.5.8 or better, Linux

Hard disk: 1GB free space

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Minimal system requirements:

CPU: Intel Pentium D or AMD Athlon 64 (K8) 2.6 GHz

RAM: 2GB

Graphics Card:(Integrated): Intel HD Graphics or AMD (formerly ATI) Radeon HD Graphics (Discrete): Nvidia GeForce 9600 GT or AMD Radeon HD 2400 

OS:Windows XP or better, Mac OS 10.5.8 or better, Linux

Hard disk: At least 200MB for Game Core and Other Files

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Note: Many factors can affect the game like Java-versions, shader-mods and so on.
Using shader-mods needs a lot of graphic performance. The requirements for the graphics card are increased a lot.
Please be sure to install the newest Java-versions to play minecraft. Java is not preinstalled on our Gaming-Systems.