Hello, I'm thinking about buying a new laptop, but cannot decide between an AMD A8 or Intel I-5.
Gaming isn't a primary issue, but I would like to play Modern Warfare. How important is discrete graphics or integrated graphics?
Discrete graphics will pretty much always beat integrated graphics. If you want to know by how much for any particular combo, you need to be looking at benchmarks.
You don't get that performance for free, though. Not only is it more expensive to put a discrete card in a laptop, they use much more power and your battery life suffers. Up to you to decide if you want that or not.
If you do decide to go with integrated, you'll definitely want an AMD chip (their integrated graphics is much more powerful), and you probably want to wait a couple weeks to see what's happening with Trinity. since they'll be shipping soon and have more powerful still integrated graphics.