Overclocking question

[softwebdev]

I have a few questions about overclocking

after setting FSB and mobo jumper for the appropriate CPU speed, do i have to increase the core voltage or this is OPTIONAL ? (assume my computer is RUNNING FINE)

How about memory, PCI , and AGP bus? what do i do with them?

a clear example will be helpful.

thank you

 

[cookieman]

Welcome to Anandtech forums!

First of all, please read the forums thoughly for a few days/weeks. It will answer almoust all of your question without asking the same all over again.

But for anyone to be able to help you must provide as much detail about your config/experience as you can.
Without it you will be left in the dark.

Cheers,

 

[Pederv]

Increasing the voltage is usually done only as necesary. Some people will set the voltages to the maximum and then try and overclock. Some people have a target MHz they want to reach and try everything to get there. Me, I just go as high as I can without increasing the voltages.
Usually you will only be able to control the voltages on the memory and/or the cpu, not the PCI and AGP. The memory, PCI and AGP buses are affected if you increase the FSB frequency. The PCI and AGP buses are running at a fraction of your FSB, this fraction depends on your FSB.

100MHz FSB
PCI = 1/3 = 33MHz
AGP = 2/3 = 66MHz

133MHz FSB
PCI = 1/4 = 33MHz
AGP = 1/2 = 66MHz

 

[softwebdev]

thank you very much for giving me a warm welcome here. I'm feeling at home. Now get back to my question.

you mentioned 100-133 FSB. All the processors still use 100-133 FSB NOW? Intel has 400, AMD has 266

 

[Pederv]

The base frequency of most all motherboards is 100MHz or 133MHz. The P4 clock is quad pumped, it takes 1 clock cycle and makes it into 4 clock cycles. The Athlon clock is double pumped, it takes 1 clock cycle and makes it into 2 clock cycles.

Think of it this way, there are 4 possible states to a square wave (used in clock signals).
State 1 - Rising edge
State 2 - High level
State 3 - Falling edge
State 4 - Low level

Intel uses all 4 possible states, AMD only uses 2.

 

[softwebdev]

1 more question and i'm ready to overclock


Overclocking the FSB really increased performance because it also increases the speed of other systems like PCI and AGP speeds

is this statement truth ? if so, i don't have to increase the speed of PCI and AGP because FSB will do it for me automatically.? Yes?

The only thing that i have to do is FSB * multiplier = SPEED right ?

 

[fwupow]

I OC'd my @$$ and can now crap in half the time.
My GF isn't happy with my performance at other things though.

 

[Kipper]

Keep in mind that pumping the FSB to very high speeds can sometimes HURT more than it improves performance. Some PCI/AGP/IDE devices do not like higher FSB speeds because they simply cannot handle them and this can sometimes compromise stability. Keep that in mind while OCing as well. For example, while I am able to write to my CD-R using my computer at 133 MHz FSB and up to around 137 Mhz, if I bump it past 145 my computer chokes up and I repeatedly burn coasters at a regular rate.

 

[softwebdev]

<< Keep in mind that pumping the FSB to very high speeds can sometimes HURT more than it improves performance. Some PCI/AGP/IDE devices do not like higher FSB speeds because they simply cannot handle them and this can sometimes compromise stability. Keep that in mind while OCing as well. For example, while I am able to write to my CD-R using my computer at 133 MHz FSB and up to around 137 Mhz, if I bump it past 145 my computer chokes up and I repeatedly burn coasters at a regular rate. >>



increase 5% of FSB is the SAFE point ?

thank you for your advice. I'm having more confident now and will let you know how my overclocking progress it after extensive STABILITY TEST.