Two years ago, a top of the line Video Card, wouldn't compare to CPU mining of those days. To think that a video card would be better at mathematical equations than a CPU (designed for computing) would be idiotic.
You dont honestly be leave that do you?
(You did set the tone with the "idiotic"-comment)
Firstly a CPU is designed to run programs not compute stuff (yes i know the difference is fine but its there), the CPU's does not focus on common integer operations.
Secondly this stuff is any vector processors wet dream. And the problem GPU's had a few years ago was double precision floats not integers.
Which should be obvious to anyone that have taken computer architecture/hardware 101 and read about Flynn's defs. more specifically the SIMD architecture.
Thirdly, two years ago they the 5750 (which is what i use) was released and it delivers ~180Mh/s
And last, the speed at which stuff is mined doesnt matter at all. Its just a game of who has the most equipment - how large is your share.
The stuff that matter is how much the mining capacity varies (look at current namecoin difficulty the 2 week cycle will be finished in jan.).
/GoK