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Thread Starter 
WCCF source has been taken down, however VideoCardz has a page with the same information. Not sure if this counts as a re-post. If it is a re-post, I apologize in advance.
AMD Radeon R9 290X can process up to 90% more geometry than HD 7970 GHz Edition (4 billion triangles per clock vs Tahiti’s 2.1). The computing performance (single precision floating point) has increased by 30% to 5.6 TFLOPS. Thanks to more Texture Mapping Units and Raster Operating Units we have 30% and 90% fill rate increase for textures and pixels respectively (176 Gtexels/s and 64 Gpixels/s). According to the slide, also the Peak GFLOPs per mm2 has slightly increased by 5% (to 12.8 GFLOPS/mm2).
Dual DMA engines
-Can saturate PCIe 3.0 x16 bus bandwidth(16 GB/sec bidirectional)
Up to 1TB/s L2/L1 bandwidth
320GB/sec memory bandwidth

Images: Warning: Spoiler! (Click to show)