Yes your build will do well in Dolphin. Be aware that dolphin can't use SLI and you'd benefit more from a 4790k instead of the extra gpu strictly in terms of dolphin. As an owner of a 4690k + 970 dolphin has done well on everything I've thrown at it without overclocking and at 4x native + 4x SSAA.
[color=green]Windows 7 x64 / i5 4690k @ 3.5 GHz / GTX 970 / 8GB RAM[/color]
