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Empirical recommended requirements:
CPU: A quad-core running at 4 GHz or faster
GPU: NVidia 660Ti or Radeon HD 7870, Laptop cards: 680M or 7970M
RAM: 8 GB
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I think at 660Ti | 7870 is a bit of an overkill for baseline system. My wifes system chugs along fine at 1080p with a HD 6850 and i5 2500K. If you want to kick things up to High settings, then ya, a 660 or 7870 might be required. The graphics settings in PS2 can be adjust to reasonably accommodate almost any GPU, its just the CPU bottleneck (or possibly the memory) that the settings don't effect.