Will it be enough?

[Shonumi]

The OP probably has an Intel GMA X4500, which would bottleneck performance even at 1x with no AA. Those chips were made circa 2008 iirc, so the OP's CPU should be somewhat modern (not as old as a P4, thankfully). In that regard, a GT 520 would be a cheap, easy upgrade (about $40) and then at least the system might be able to play games at 1x. The CPU could turn out to be too weak to play Dolphin, but we can't say until the OP tells us the exact model.