It appears that many of the repliers did not read the article or note the conclusions they reached:
<< Most modern games will probably benefit more from a faster CPU than a "faster" video card >>
So the answer is "depends" with most serious gamers NOT finding a 1.1Ghz CPU to be "fast enough".
In my own case - to get improvements in Max Payne, RtCW, SS, etc. - last year, I did upgrade my CPU from 800 to 1.24Ghz without upgrading my (last gen.) Radeon 64 . . . my NEXT upgrade will be a 2.0+ CPU and a next gen videocard.
Yet I find my notebook's 866 PIII-M and last gen 16MB DDR ATI Radeon "good enough" to play the abovementioned games (although I lower the resolution to 800x600) . . .
Depends what you mean by "good enough" . . .