Imagination Technologies has detailed its next-gen PowerVR Series7 GPUs -- and boy are they beastly. Imagination is claiming a performance boost of 60% over its Series6 GPUs, clock for clock, which for a single generational leap is pretty darn impressive. The top-end Series7XT GT7900 will feature 16 clusters, for a total of 512 ALUs and peak theoretical performance above 1 teraflop -- or around the same as an Nvidia GTX 750.