AvPGalaxy offers minimum and recommended system specifications for Aliens vs. Predator, Rebellion's sci-fi shooter remake (thanks Blend Games). Here they are:

Minimum Requirements:

Windows 7/ XP/Vista 1 GB System RAM (XP)/ 2 GB System RAM (Vista) 3.2 GHz Intel Pentium 4/Athlon 64 3000+ or equivalent processor DirectX 9.0c compliant video card with 128 MB RAM (NVIDIA 6600 or better, ATI X1600 or better)

Recommended Requirements:

Windows 7/ XP/Vista Intel Core 2 Duo E6400 or equivalent processor 2 GB System RAM DirectX 9.0c compliant video card with 512 MB RAM (NVIDIA 8800 series, ATI HD2900 PRO or better)