Dekasav :
Just leave it. Any bottlenecking is probably very minor. Also, even if the cpu is bottlenecking it, if it's above 30-40fps, who cares? And if it matters to you, and you want the absolute optimum fps for each part, just turn up the AA/AF a little.
I think most people are too concerned about bottlenecking because it usually doesn't matter much. Only time it's really important is if your cpu is holding a game to 15fps, no video card will save you (and vice versa).
It's very true what you point out, and let me add the actual importance of knowing if your system bottlenecks your video card:
Video cards are not a "cheap" component in most cases and go by hand with CPU costs, so you'll be spending a lot of bucks for a piece of hardware, right? Now, what if that new piece of hardware doesn't perform on par with the rest of the system (a bottleneck)? That tells me you threw a few bucks to the toilet since you're not getting 100% of what you paid for. Now, some scenarios are omg-bad and some (like you point out) are not. So, talking about money here, i'd say it's always a good question to ask if your current CPU/MoBo/RAM will bottleneck your Video card, cause you'll be spending money on that piece of hardware that you might not need at all, or just need something of a "lesser upgrade".
Now, there's a lot of "but"s and "if"s in there mixed up, but i hope you get the main idea XD
Esop!
PS: Sorry for the off-topic xP