the amd 8 core jaguar apu. That’s the update to the existing Brazos 2.0 architecture, possibly on a smaller manufacturing process, and is suggested to be running at a positively pedestrian 1.6GHz clock speed.
The reason it’s such a low-speed part is because it’s one of AMD’s ultra-mobile parts running at just 18W in dual-core guise. That power draw will rise with this touted eight-core version however.
In our PC world though I couldn't possibly recommend that family of chips for a competing machine, and in a desktop rig, constantly plugged into the wall, you don’t need to bother jamming in a mobile chip. The silicon I’d put up against this is the AMD FX-6300. It may only be six-core, but it’s already running at twice the speed of the Jaguar cores, and with more effective cores too, so it’ll make sure your GPU is happily fed with data.