Well, I suggest you to full upgrade your pc, since that spec is already out of date.
A dual core (or Core2duo) with high clock is needed to run Dolphin, since Dolphin doesn't support quad core.
So a Core2Duo 3.0GHz has better speed when running Dolphin rather than Core2Quad 2.0GHz.
If your motherboard can support it, just get a Nvidia or ATI card that support opengl2.1
A dual core (or Core2duo) with high clock is needed to run Dolphin, since Dolphin doesn't support quad core.
So a Core2Duo 3.0GHz has better speed when running Dolphin rather than Core2Quad 2.0GHz.
If your motherboard can support it, just get a Nvidia or ATI card that support opengl2.1