Ok, someone feel free to correct me if my logic is wrong, however, I was thinking about it some and from my understanding (feel free to correct me if I'm wrong, I'm new at this), but Bitcoins use your GPU and Litecoins use your Ram? Therefore, couldn't you use all of your ram to mine Litecoins, and your GPU for Bitcoins. And also if you were to do that, how much ram would you need? Because my laptop has 12gb of ram.
Some crypto-currencies can use merge mining. (NMC and BTC for example. They use the same proof of work for both systems.) Since the algorithm is different you can pick one or the other or share the resources of your GPU.