Here's a little history
More advanced stuff
Some systems have "bottlenecks," where small overclocking of a component can help realize the full potential of another component to a greater percentage than the limiting hardware is overclocked. For instance, many motherboards
with AMD Athlon 64
processors limit the speed of four units of RAM to 333 MHz
. However, the memory speed is computed by dividing the processor speed (which is a base number times a CPU multiplier
, for instance 1.8 GHz is most likely 9x200 MHz) by a fixed integer
such that, at stock speeds, the RAM would run at a clock rate near 333 MHz. Manipulating elements of how the processor speed is set (usually lowering the multiplier), one can often overclock the processor a small amount, around 100-200 MHz (less than 10%), and gain a RAM clock rate of 400 MHz (20% increase), releasing the full potential of the RAM.
also produced x86 designs which competed with Intel on performance rather than price. In January 2002 the Pentium 4 gained a lead in sales and AMD marketing responded by giving their processors numeric suffixes approximating the clock rate that an AMD Thunderbird
(and by inference a Pentium processor) would need to give matching performance, openly undermining the "megahertz myth".