lol no. Don't listen to these clowns.
You are going to have the same FPS dips (minimum FPS) in clogged areas of the game regardless of what GPU you choose.
The difference is that with a higher end GPU you will be able to push higher detail settings, more resolution, higher average FPS, and higher maximum FPS. So even with a Phenom II, your game will look better with a more powerful GPU than a weaker one.