On this page ...
The current generation of CPU's
is pretty powerfull, but you will have to agree that there is
no such thing as "enough power" when talking about CPU's.
I guess speed grows on you, you
get used to it pretty quick ...
So, we want faster CPU's.... unfortunally
these come not cheap. A really fast CPU can cost you over a $1000,
which is a lot of money to me.... So we have to find a diferent
solution in getting more performance.
We're about to make the CPU work
it bit more ...
may harm your CPU, hardware and even wreck the data stored on
your harddrive, so please read the disclaimer!
Let's start with the fact that CPU's are
build in large batches. None of the manufacturers will test all of these
CPU's individually, they will take a sample and see if it meets the specifications
set. For example a 900 Mhz CPU batch. The samples perform poorly and can
only be sold as a 600 Mhz CPU.
Another reason to sell a 900 Mhz CPU for
a 600 Mhz CPU can also be due to the lack of available 600 Mhz CPU's.
Just relabeling the CPU's won't be sufficient.
The need to be locked, otherwise why buy a $1900 CPU when a $150
CPU does the same job ?
So the manufacturers lock the CPU
with a hardware locking mechanism. We need to hack that locking mechanism
which is NOT the same for each CPU type.
How is the frequency set ?
For most CPU's (specifically in the Intel
class CPU's, where we find AMD, Cyrix, etc also) frequency is set as follows:
Base clock (=FSB) * multiplier
This way a 600 Mhz is set as: 100 Mhz *
6 = 600 Mhz.
So there are 2 variables setting
the final frequency, the Front Side Bus clock and the Multiplier.
Changing either one of them results in a different frequency:
multiplier of 6 set to 7: 100 Mhz * 7 =
base clock of 100 Mhz to 110 Mhz: 110 Mhz
* 6 = 660 Mhz
There are basically 2 base clocks: 66 Mhz
(Intel for example) and 100 Mhz (faster Intels and AMD for example). 133
Mhz and others are out there too.
This is not the only thing to set. More
performance requires more "energy", therefor we might be forced
to increase the CPU Voltage.
There is one downside to increasing voltage:
heat. The higher the voltage, the higher the heat produced and therefor
cooling must be improved.
In this very brief intro we see that overclocking
is possible. However very specific for each CPU type, that's why I wrote
down my own experiences for WeetHet, two examples: