Although the Cortex-A8 and Scorpion cores share many similarities, the Qualcomm design delivers better performance. Both cores support the NEON set of SIMD instructions for integer and single-precision floating-point arithmetic, and the VFP extension for double-precision arithmetic.
The Scorpion core, however, can process SIMD instructions in 128-bit-wide chunks, while the Cortex-A8 is restricted to 64 bits. Scorpion also has a deeper pipeline, which includes VFP commands, while VFP commands are not pipelined in the Cortex-A8.