Generally, bottlenecks is an incredibly misused term.
EVERY system has a a limitation, and that limitation moves constantly based on what you are doing and ultimately, there is rarely anything wrong with a bottleneck.
In CPU intensive applications, your CPU will be a limit. In GPU intensive applications, your GPU will be a limit.
There is no "value" to bottlenecking. You cannot calculate it. And even if you could, it would change all the time, depending on the application you are running. Bottlenecks aren't inherently bad things, every system has one. It doesn't cause any major disruption, just means you hit the limitation of one of the components, meaning you aren't utilising another to it's full potential.
But in short, would I be concerned about the combination you've put together? No. You'll be fine, then if you notice that with some of your applications, you don't like the performance, then you'll be able to find out which component to upgrade. The i5 whilst old can still run on better GPUs depending on the game.