

More clarification: this is more about clock speed. Having a fixed clock frequency is important for making sure that everything functions correctly. Transistors take a certain amount of time to turn on and off, which for the most part is a fixed time duration. This can change with temperature, voltage, and design.
Trying to run the clock too fast may mean that parts of the device havent fully turned on or off, or signals havent fully propagated through for parts that chain transistors together.
Some devices will have better transistor or worse transistors due to variations between batches and there can be some variation within a single part.
The clock is therefore set to be in a range that gives the highest performance possible while also ensuring stability (some overhead to allow temp, power, noise and variation to not cause instability).
The clocks in this case are running 0.57% faster which is negligible, and likely well within the margin of error, though this upward drift is a natural consequence of the aging of the components (specifically the quartz resonator that sets the frequency).
Modern processors do the same thing as these processors, though they also allow variable clock speeds. This allows turning down the clock speed most of the time to save power when not much is going on. This also means there is also some minor overhead available on many cpus.
This is where “overclocking” comes from. Turning up the clock speed until the device becomes unstable, adjusting the voltages, temperatures, power, noise, etc. to get more performance out of the same part.
Adjusting just the clock doesnt account for the fixed timing of the transistors (thus changing voltages, temps), and theres less overhead on modern processors, so its more of a mixed bag of results. Additionally, the CPU itself can degrade over time, and this shrinks the overhead. For the either old or modern cpus, it may have had 10% of headroom, which would shrink over time due to cpu degredation to lets say 5%, so a 0.6% increase due to resonator degredation is negligible.
Overclocking is also possible on older consoles, though with differing levels of success. These older consoles were designed with a fixed frequency, and as a result many games are not designed to account for differing framerates. This means running the game faster doesnt just mean a higher fps/smoother gameplay, but you may literally move twice as fast if the game runs twice as fast.
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