Acer 500L - Manual (Page 85)

Chapter 3 BIOS Utility 3-39
CPU Frequency
Bus Frequency ................ 66/100 MHz
CPU Multiple ................. [3]
Processor Speed .............. xxx MHz
Bus Frequency
The bus frequency refers to the speed by which data is transferred
between internal computer components and the CPU or the main
memory of the CPU. A fast bus allows data to be transferred faster,
which makes applications run faster.
CPU Multiple
This parameter sets the Core/bus ratio of your system. The clock
speed of the bus does not necessarily equal the CPU’s (core). The
bus clock speed is often slower than the CPU clock speed
.
Processor Speed
The processor speed is the speed at which a microprocessor executes
instructions. Clock speeds are expressed in megahertz (MHz), with 1
MHz being equal to 1 million cycles per second. The faster the clock,
the more instructions the CPU can execute per second.