Vía Kotaku y desde el foro oficial de Bulletstorm:

Bulletstorm requires the following minimum configuration:

Operating System Windows XP (SP3), Windows Vista (SP2), or Windows 7
Processor Intel Core 2 Duo, AMD Athlon X2, or equivalent, running at 1.6 GHz or greater
Memory (RAM) 1.5 GB
HDD Space 9 GB available
Video Card DirectX 9.0c compatible, 256 MB of VRAM; NVIDIA GeForce 7600 GS, ATI Radeon HD 2400 Pro 256 MB, or greater
Soundcard DirectX 9.0c compatible, 16-bit
Disc Drive 16X CD/DVD Drive
Network Internet (TCP/IP) connection

The following configuration is recommended to run Bulletstorm:

Operating System Windows Vista (SP2), or Windows 7
Processor QuadCore 2.0 GHz
Memory (RAM) 2 GB
HDD Space 9 GB available
Video Card DirectX 9.0c compatible, 512MB of VRAM; NVIDIA GeForce GTX260, or ATI Radeon 4870
Soundcard DirectX 9.0c compatible, 16-bit
Disc Drive 16X CD/DVD Drive
Network Broadband Internet (TCP/IP) connection
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Community Coordinator

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Epic Games, Inc.
http://forums.epicgames.com/showthread.php?p=27860027

Y yo que pensaba que mi PC se estaba quedando viejo.. Aun puedo jugar con mi pequeña máquina :D, y vosotros?