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These are not etched in stone so your mileage may vary
But they do indicate there can be extreme differences due to hardware. My older P4 has a modest graphics card so a better card might improve performance, slightly.
The dual core PC is a low end machine and uses a graphics chip – no card! It won't ever run Creator 2009 Video apps in XP but does using a Vista OS…
The quick will notice that I didn't actually time BD rendering