Overclocking Pentium 4 EE LGA775

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Clyde

n00b
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Sep 19, 2004
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Hello,

I've got a question about overclocking a Pentium 4 3.4 EE LGA775 and running his bus speed at the same speed as the DDR memory (running synchronic).

Say that you've got DDR2-667 (PC2 - 5300) and you wanna run the CPU bus speed at the same speed as the memory. Then you need to run your P4 at 166MHz bus speed (quad pumped). Right?

So say you want to overclock that CPU to 3.8GHz, then u need this lineup??:

"3400 @ 3818 MHz (166 * 23)" Can you like get that high multiplier on an unlocked version?
 
Good luck getting it to do it. I've been reading that they can't get the same overclocks out of the 915x 925x chipsets they used to out of the i875P chipsets.
 
I think your goal is to run the memory at the cpus bus speed wich would bring the ddr from 166-200 quad pumped, not lower the cpu to memory speeds :D
 
Sir-Fragalot said:
Good luck getting it to do it. I've been reading that they can't get the same overclocks out of the 915x 925x chipsets they used to out of the i875P chipsets.
Click to expand...

so u cant get as high as 166MHz front size bus and muliplier 23 on a P4EE ES?
 
Clyde said:
so u cant get as high as 166MHz front size bus and muliplier 23 on a P4EE ES?
Click to expand...


Why the heck would you want to lower your front side bus??????
 
Why don't you keep it at the default multiplier, which should be 17, then just increase your front side bus to overclock?
 
Say that you've got DDR2-667 (PC2 - 5300) and you wanna run the CPU bus speed at the same speed as the memory. Then you need to run your P4 at 166MHz bus speed (quad pumped). Right?

You would need to set the fsb to 333 MHz to run dram memory at 333 MHz in 1:1 sync (DDR would double this to 666 MHz by transfering data on the falling side of the clock cycle). Now with your 3.4 GHz cpu, the multiplier is 17 (200 MHz x 17=3400). Thus, with the fsb at 333 MHz your cpu would be running at 5,661 MHz (333 x 17).

So say you want to overclock that CPU to 3.8GHz

To get your cpu to 3.8 GHz, you would have to overclock the FSB to 224 MHz.
 
poopy said:
Say that you've got DDR2-667 (PC2 - 5300) and you wanna run the CPU bus speed at the same speed as the memory. Then you need to run your P4 at 166MHz bus speed (quad pumped). Right?

You would need to set the fsb to 333 MHz to run dram memory at 333 MHz in 1:1 sync (DDR would double this to 666 MHz by transfering data on the falling side of the clock cycle). Now with your 3.4 GHz cpu, the multiplier is 17 (200 MHz x 17=3400). Thus, with the fsb at 333 MHz your cpu would be running at 5,661 MHz (333 x 4).

So say you want to overclock that CPU to 3.8GHz

To get your cpu to 3.8 GHz, you would have to overclock the FSB to 224 MHz.
Click to expand...

okay... thnx, i now get it :)
 
last question..

now that i know how to use the multiplier and busspeed.. what about the voltage?

i hear people talking about those voltage things, but do i need to adjust them too?
 
not unless your havinng problems. I'm no expert....hell, I'm not experienced at all, but from what I've read you should increase the voltage to give the cpu more power, which it needs for running at higher speeds.
 
only increase it a bit, I am not sure what the limits on prescott cores but for northwood cores its about 1.7v anything more and you are pushing your luck as far as the length of the CPU life.

Prescott is lower I assume since its stock vcore is lower. Also higher vcore means more heat.

The best overclock is the one attained closest to stock voltage.
 
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