The GT7900 is designed to be made on a 14nm or 16nm FinFET process and is part of a bigger platform that features a quad-core, dual-thread I6400 MIPS CPU that supports Android 5.0. Full details at FUD Zilla.
Imagination highlighted some figures in its bullish press release:
“It includes 512 ALU cores and delivers up to 800 GFLOPS (FP32) or 1.6 TFLOPS (FP16) graphics and compute performance at 800 MHz (16 nm FinFET+); to give you an idea of how it stacks up versus the competition, a Kepler-based GeForce GT 730M from NVIDIA delivers about 550 GFLOPS (FP32) at a comparable frequency.”
The goal is to bring PC performance and hardware support to Android devices, with OpenGL ES 3.1, new shaders, HDR texture compression and tessellation. Of course, the GPU supports UHD/4K resolutions.