Analysis of information sources in references of the Wikipedia article "Transmeta Crusoe" in English language version.
Although the FPU/multimedia unit can handle the same data types as Intel's MMX instructions, Crusoe chips don't have the new 128-bit registers defined by Intel's SSE (Streaming SIMD Extensions). Transmeta says Crusoe could emulate SSE-type instructions and registers, but there's not enough software support for SSE to justify the effort at this time.