You can read the various blog articles to find out what has improved. Fixes range from improvements to gpu, fifo emulation and cpu, jit optimizations and numerous graphical issues fixed. Fixes to audio emulation and currently in progress rewrite of the Zelda ucode. Games that utilize AX ucode's have near perfect if not perfect audio output. No more bgm stopping in several games including Zelda Ucode games like Super Mario Galaxy 1/2, Zelda Twilight Princess, Mario Kart Double Dash etc.. several games run flawlessly and more games are compatible. The JIT optimizations courtesy of Fiora and others, buffer storage (for Nvidia gpu's), improvements to both the DX/OGL backends have really boosted performance. For example I can achieve between 100fps to 200fps in Super Mario Galaxy 1/2 on my old i7 950 @ 4GHz.
I think on newer cpu's the requirements to overclock to achieve good performance are past. Meaning you can stick with safer stock clocks and reach full speed in most games.
I think on newer cpu's the requirements to overclock to achieve good performance are past. Meaning you can stick with safer stock clocks and reach full speed in most games.