That doesnt mean other people havnt, and nvidia releases betas almost with every new game that comes out to fix known issues or to increase performance.
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No, no, no. GPGPU calculations, which that 9.6 TFLOPS machine is doing, doesnt require crossfire. If you had a mainboard with 16 8x PCIe slots you could compute with all 32(16x2) GPUs. AFR / DX10 does not support more then 4 GPUs, just like DX9 does not support more then 3 GPUs. Have you missed all those small grey 'Only in Vista' notes?