I don't see much potential bottlenecks in your system. You just have to know that the 550 Ti is designed for 1680x1050. If you're gaming at 1080p, these days you're having to step up to a 7850 or 660 if you want to guarantee that you can play on high to max. 550 Ti might handle medium settings at that resolution. A 7770 will not be able to handle everything at 1080p either.
Thanks, that's all I want to know.
I'll keep talking even though you already selected best answer. The reason it's a bad card is because you could get a better card for the same price, and less in some case. Even if you don't care that much about gaming; you would still prefer more for the same price right? Also I can't imagine there would be a system bottleneck. Even though that is an old mobo, 1.0 should be fine for a card of that strength.
You're absolutely right. Thank you very much, appreciated.