RPCS3 FAQ

There is a game running in a good speed?

I would like to play Ni No Kuni

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Will work with my PC?

i5 4460 3.20Ghz Haswell
8GB DDR3 1600mhz
GeForce GTX 760 2GB

It will work but for a foreseeable feature you wouldn't be able to run something worth emulating (at decent speed).

Do you say that because of my specs, or because the software is still in a "beta phase"?

Both. Right now mainly because of development stage but later your cpu might become a bottleneck. But as it is - currently, the stronger your system is the better and there is no any big commercial game that runs at full speed on current hardware. With further development and optimization the situation will surely change drastically but this can be years from now (see how long it took pcsx2).