Squilliam said:
Windows 7 comes with a pretty good software renderer, so perhaps the CPU was running a higher spec Direct X version than your GPU could provide? |
Let's be serious - last game that could have been run comfortably on CPU only was Quake 2 or 3 something around that date.
If significant performance difference is visible then it's probably coming from GPU drivers.
http://www.anandtech.com/systems/showdoc.aspx?i=3666&p=7
here's another bunch of performance tests than show performance differences to be well below measurement error margin (only area of improvement here is moving huge amounts of files through storage system).
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