AMD Phenom II X2 560 CPU - good enough ?

[YellowWii]

It's 4 years old, but my PC specs are as follows:

CPU: AMD Phenom II X2 560
Video card: Sapphire HD 7850 - 2GBytes RAM
Motherboard: ASUS M4A88TD-V EVO USB3 (AM3 CPU socket)
RAM: 4 GBytes
Operating System: Ubuntu 13.04 64-bit (not yet installed, hence this post)

I know the CPU isn't great - I was thinking of upgrading it to the AMD Phenom II X6 1100T (if I could find one at a reasonable price) as I can't afford to upgrade both the motherboard and the CPU

I could overclock my existing CPU of course or even enable more of the cores.

However, given my current config, will any games run at full speed with full sound emulation? Wii Sports perhaps?

How about Super Mario Galaxy? Or will I experience massive slowdowns?

I'd be using one of the recent dev versions of Dolphin.

Thanks