What can I run?

[Kubamach]

So, I've got a new PC for emulation. What can I run?
My specs: 4gb RAM DDR3
AMD Radeon R5 200 Series
Intel Xeon 2.4GHZ Quadcore

[Zaladane]

Should be ok on everything. Maybe some lag still on more graphic intense ps2/gc/wii games.

[rmcin329]

Might also wind up with lag on psp and ds games.

[Kubamach]

Should be ok on everything. Maybe some lag still on more graphic intense ps2/gc/wii games.

Tried NSMB Wii, intense lag on DX11, but 50-60fps on OpenGL

[Zaladane]

Tried NSMB Wii, intense lag on DX11, but 50-60fps on OpenGL

Yep. There isn't a whole lot of options you need to mess with for Dolphin. If a game isn't running fast enough switching the backend is usually all you need to do (like you did)