An overclocked G3258 will massively beat any i3 in single and dual threaded tasks (such as Dolphin and the majority of day-to-day stuff), and will beat or tie an i3 in tasks with three or more threads. This has the notable exception of things that refuse to run on dual-core chips, like Far Cry 4 - they count the number of hardware threads (sometimes counting hyperthreads too) and just refuse to run, even if they'd run fine when threads were switched on just the two cores.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT