Hey, my actual gpu is dead And i buy a newest gpu. I'm looking one for gaming. Not care if the CPU is bottleneck the gpu, in the future I'm going to upgrade the rest.
Trust me you wouldn't want to bottleneck the CPU. Even a lousy graphics card can perform better than having a high end graphics card with the Athlon II x4 640.
My best advice is save up. And I knwo your graphics card is dead and barely able to run any games. But I highly recommended saving money for a new CPU, motherboard and a GPU.