CPU:
That CPU will struggle with any games that aren't light to light-medium. AMD has weak single-core performance, which Dolphin needs. The CPU will most likely struggle with the game series you mentioned, depending on what game (ex: Mario kart DD, Smash bros brawl)
Tell him to up his budget some and switch over to Intel. We usually recommend the i5-4670K and a Z87 motherboard. (the i5 will perform better even outside Dolphin)
i5-4670K: http://www.amazon.de/Intel-4670K-Prozessor-Sockel-LGA1150/dp/B00CO8TBOW/ref=sr_1_2?ie=UTF8&qid=1398116508&sr=8-2&keywords=intel+i5
Z87 mobo: http://www.amazon.de/MSI-7816-001R-Z87-G43-Mainboard-Graphics/dp/B00CXOMGGW/ref=sr_1_1?ie=UTF8&qid=1398116552&sr=8-1&keywords=mainboard+1150+z87
GPU:
I don't know AMD graphics cards, so someone else will have to tell you about what is good in Dolphin.
But the IR comes down to the bandwidth, and the r7 260x has 112 GB/sec, which is good, and (I think) will probably get you around 4xIR
edit: the only AMD CPUs that come close to matching Sandy Bridge/Ivy Bridge CPUs are the most expensive and top of the line FX and A10 CPUs.
That CPU will struggle with any games that aren't light to light-medium. AMD has weak single-core performance, which Dolphin needs. The CPU will most likely struggle with the game series you mentioned, depending on what game (ex: Mario kart DD, Smash bros brawl)
Tell him to up his budget some and switch over to Intel. We usually recommend the i5-4670K and a Z87 motherboard. (the i5 will perform better even outside Dolphin)
i5-4670K: http://www.amazon.de/Intel-4670K-Prozessor-Sockel-LGA1150/dp/B00CO8TBOW/ref=sr_1_2?ie=UTF8&qid=1398116508&sr=8-2&keywords=intel+i5
Z87 mobo: http://www.amazon.de/MSI-7816-001R-Z87-G43-Mainboard-Graphics/dp/B00CXOMGGW/ref=sr_1_1?ie=UTF8&qid=1398116552&sr=8-1&keywords=mainboard+1150+z87
GPU:
I don't know AMD graphics cards, so someone else will have to tell you about what is good in Dolphin.
But the IR comes down to the bandwidth, and the r7 260x has 112 GB/sec, which is good, and (I think) will probably get you around 4xIR
edit: the only AMD CPUs that come close to matching Sandy Bridge/Ivy Bridge CPUs are the most expensive and top of the line FX and A10 CPUs.