I was investigating this stuff years and years back before anyone was even talking about frametimes ( see a screenshot from the program I created to visualise the results http://aten-hosted.com/images/viz1.jpg this program let me compare the "real" framerate side by side with the benchmark frame output or the resulting frame output from 2 different systems side by side including hardware captured frametimes if you have the hardware ) when the whole FCAT stuff broke I was having to provide information and/or correct people on some of the basic concepts - including some people who are now accusing me above of not knowing what I'm talking about.
Despite what some people may think there is no AMD v nVidia twist to what I'm saying and while I might not have a great deal of love for AMD, tho my main gripe with them comes from software/developer support - which is something they've been making big strides to improve lately, I'm not just going to make up a whole non-existant issue or embelish the problem at a level that it doesn't exist at just to attack them out of spite.
At least AMD acknowledge and fix problems, not like Nvidia who just ignore their costumers and knock out drivers that kill GPU's
