I guess it depends on how closely you want to emulate the platform. For example, there was a great article [1] about a SNES emulator that required an extremely

I guess it depends on how closely you want to emulate the platform. For example, there was a great article [1] about a SNES emulator that required an extremely powerful machine, because it aimed to be a 100% accurate emulator. I guess if pcwalton decides to go for a very accurate NES emulator, the CPU usage would be non-negligable. [1] http://arstechnica.com/gaming/2011/08/accuracy-takes-power-one-mans-3ghz-quest-to-build-a-perfect-snes-emulator/ http://arstechnica.com/gaming/2011/08/accuracy-takes-power-o...