IPC != GHz. I don't know the exact ratio, but even though AMD's cores can get pretty good cycle rates, they're still nothing compared to a good Core i5 3570K or Core i5 4670K. That's why a Pentium 4 at 3 GHz, even per core, is monumentally slower than a Core2duo at 2.4 GHz. And it continues to processors nowadays. Unfortunately AMD hasn't kept up with the IPC of Intel Processors and that makes them very slow, especially for programs that use less than 4 cores.
Your processor just isn't very fast, that's all there is to it. If your friend is a similarly priced Intel CPU, then that's why they can run Mario Galaxy without trouble while you struggle.
Funfact: Metroid Prime is a very hard game to emulate, even if you can Run Mario Galaxy just fine, you'll still have some minor stutters during loads and such in Metroid Prime.
Your processor just isn't very fast, that's all there is to it. If your friend is a similarly priced Intel CPU, then that's why they can run Mario Galaxy without trouble while you struggle.
Funfact: Metroid Prime is a very hard game to emulate, even if you can Run Mario Galaxy just fine, you'll still have some minor stutters during loads and such in Metroid Prime.