Originally Posted by GhanBuriGhan 
Its still a nice looking game even on low, but if you can afford the CPU upgrade- sure! My AMD 2x 4400+ only allows me to play on low, inspite of a decent GPU.
My previous PC was an X2 4400+ and 4870, same as you. I carried the GPU over to the new build with an i7 950, and though I didn't try the old computer, I think it's clear the new CPU unleashes the 4870