Should run on anything that's played a 3D game in the last 4-5 years.

Street Fighter IV screenshot

Capcom's sent out confirmation of the system requirements for the PC version of Street Fighter IV, bringing cheer to many a PC gamer with a less than cutting-edge rig.

Minimum
OS: Windows XP
CPU: Intel Pentium4 2.0GHz or higher
RAM: 1GB or higher
HDD: 10GB of free space or more
Video Card: DirectX 9.0c/Shader3.0 or higher compatible, NVIDIA GeForce6600 series, ATI Radeon(TM) X1600 or higher or higher, VRAM :256MB or higher
Sound: DirectSound compatible, DirectX 9.0c (or higher) compatible
Input Devices: Mouse, Keyboard

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Maximum
OS: Windows Vista
CPU: Intel Core2Duo 2.0GHz or higher
RAM: 2GB or higher
HDD: 10GB of free space or more
Video Card: DirectX 9.0c/Shader3.0 or higher compatible, NVIDIA GeForce8600 series or higher, ATI Radeon(TM) X 1900 or higher, VRAM :512MB or higher
Sound: DirectSound compatible, DirectX 9.0c (or higher) compatible
Input Devices: Gamepad :Xbox360 Controller for Windows

As you can see, even the "maximum" configuration doesn't feature top of the line components.

Street Fighter IV is scheduled for a July release on PC.