Can this machine run games like Super Smash Bros. Melee/Brawl at 1080p?

[AnyOldName3]

If you are on quad core then it will use 50% at most for the emulation as it is a dual core program, unless you have lle on thread, in which case it will use some of the third core, but not all, so if you are reaching 60% on a quad core then you have filled the first two cores completely, and it cannot use the rest as it isn't programmed to. If you see this as a major issue and want it fixed then you'll just have to learn C++ and fix it yourself.