Upgrading my PC for Dolphin?

[AnyOldName3]

Almost any 4th gen (4xxx) will beat any 3rd gen (3xxx) or older, with the exception of ultra-low-voltage parts (4xxxU) etc. vs overclocked 3570K/2500K etc. Haswell brought in a massive performance increase for emulation (although this is potentially because Dolphin is slow rather than Haswell being fast, as it doesn't have such a huge improvement in other single-threaded applications). At any rate, if the price is similar, it's likely the Haswell part is faster. Just check here, and we can tell you.