In terms of a video card being bottlenecked buy a CPU, 9 times out of 10, I'm convinced of the fact that it's either a case of an obsessive user making something out of nothing looking for issues,or worst-case a user making a big deal out of a 2% performance loss. The simple fact is even at its worst ,a bottleneck is only because you have a higher-end GPU and a lower end cpu,and you're not getting 100% use out of that higher-end GPU( weather because you're playing at a lower resolution and the jeep he was having to wait for the CPU to render or whatever other reason). constantly addressing "bottlenecks" is silly ,because it's an unending battle. No one ever made a claim that when you build a new PC ,it is going to be 100% efficient. Expecting your computer to output 100% of its potential is ridiculous IMO ,there's always going to be some hindrance or inefficiency, and the sooner a person becomes more realistic about that fact, the sooner they can stop being obsessive, and enjoy the damn computer. Unless your unable to run a given task, its silly.
It seems to me , that it's almost like the term bottleneck was created by hardware manufacturers to get gullible or obsessive people to keep buying the "newest most powerful" hardware in an endless cycle, in some vain attempt to stamp out the scourge that is the 2% performance bottleneck
.....atleast thats what i think.
There's no online survey/benchmark, or famous blogger/youtube nub ,or website study that's going to change my mind. Maybe I'm too old-school, but I believe in real world experience ,and (as of yet) I've never seen a bottleneck that was worth even thinking twice about, in a properly built computer. keep in mind im speaking on GPU's being hindered by a CPU. not broken builds, improperly built PC's, or User error.