From the latest info, I estimate
CAYMAN XT
Dual Front End (Graphics Engines) with double Tessellator Units
30 SIMD 4-way VLIW
1920 Shaders (64 per SIMD) (900MHz = 3,45 Tflops)
120 TMUs (4 Tex Units per SIMD)
2GB 256-bit Memory
32 ROPS
Performance ~30% avg more than HD5870 (DX-9/10)
Performance ~2x DX-11 Tessellation more than HD5870
Price ~$450
CAYMAN Pro
Dual Front End (Graphics Engines) with double Tessellator Units
28 SIMD 4-way VLIW
1792 Shaders (64 per SIMD) (775MHz = 2,77 Tflops)
112 TMUs (4 Tex Units per SIMD)
1GB 256-bit Memory
32 ROPS
Performance ~15% avg more than HD5870 (DX-9/10)
Performance ~1.8x DX-11 Tessellation more than HD5870
Price ~$350



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