What has to be added to the "my CPU is ancient, but I want a new high end GPU": A bottleneck is not created by hardware alone. Settings (resolution, AA etc. which depend solely on the GPU) set to a high enough level will allow a potential bottleneck to vanish if only set high enough. Example: If you were to play in Surround (with 3 screens of 4k each) the difference between different CPUs would likely be rather small, whereas using a high end GPU, perhaps even in SLI should give you pretty solid gains even on very old CPUs. Obviously though that is a unlikely scenario, but one that should not be forgotten, as at least you can bump upthe eyecandy even when your CPU holds you back.