Clock Speed; Vector Processor - Nintendo Ultra64 Programmer's Manual

RSP Architecture
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Clock Speed

The RSP clock runs at 62.5 Mhz. Normally, the CPU and the RCP clock rates
run in a 3:2 ratio.

Vector Processor

The RSP has a vector processor, implemented as MIPS Coprocessor 2. The
vector unit (VU) has 32 128-bit wide vector registers (which can also be
accessed as 8 vector slices), a vector accumulator (which also has 8 vector
slices), and several special-purpose vector control registers.
The VU instruction set includes all useful computational instructions (add,
multiply, logical, reciprocal, etc.) plus additional "multimedia instructions"
which are well suited for graphics and audio processing. These instructions
are thoroughly explained in Chapter 3, "Vector Unit Instructions".