“With up to twice the CPU and graphics performance on iPad Air, and up to four times the CPU and eight times the graphics performance on iPad mini with Retina display, almost everything you do is faster and better than ever, from launching apps and editing photos to playing graphic-intensive games—all while delivering all-day battery life.”
Compares CPU and GPU (Metal) with the A6X in the iPad (4th generation). No baseline named, read as the previous generation.
“Up to” applies to every figure in the sentence.
iPad Air announcement, October 2013, Apple Newsroom, iPad Air announcement, October 2013
CPU
Claimed up to 2×
No data
GPU (Metal): not measurable with Geekbench. No Metal before A7: the baseline has no Geekbench 6 GPU score and none can be converted.