The 560 TI will be fine for running Dolphin games, including Galaxy 2. This one I just built for you, doesn't include a GPU or RAM because yours are fine, and is about $750, will be able to run any Dolphin game you throw at it. Almost definitely your GPU and RAM are perfectly fine and usable, but you can buy new ones if you so desire.
Arch
Intel Core i7 - 4510U
iHD4400
8GB RAM
Check here first:
wiki.dolphin-emu.org
Intel Core i7 - 4510U
iHD4400
8GB RAM
Check here first:
wiki.dolphin-emu.org