The VMX128 was also modified by the addition of direct 3D (D3D) compressed data format. The dot-product instruction took far less latency than discrete instructions. The SIMD vector processor (VMX128) was modified for the Xbox to include a dot-product instruction. The CPU emphasized high floating point performance through multiple FPU and SIMD vector processors in each core. The XCPU, named Xenon at Microsoft and "Waternoose" at IBM, is a custom triple-core 64-bit PowerPC-based design by IBM. Xbox 360 took a different approach to hardware compared to its predecessor.
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