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some help needed for understanding overclocking CPU, RAM

post #1 of 8
Thread Starter 
Hello all,

Im reading the Intel overclocking guide, Because i want to get familiar with overclocking. I know what the purposes are of overclocking, so i have a goal i want to archieve. It's not great, but a beginnnig. But there are several things that i do not understand.

these are the things i wrote in my summary:

External clock speed = FSB / 4
Intel CPUs more recent than Pentium 3s are “quad pumped”.
This means that the external clock speed is one fourth the FSB."
1. This means that if the clock speed is 200, the FSB is 50 Right?

Processor Frequency = clock speed x Multiplier
if a CPU can handle 3.6 GHz, it can do so equally at 400x9, 450x8, and 600x6. Manipulating the multiplier permits fine tuning of CPU settings in relation to the RAM and mobo settings.
2. The multiplier should be adjusted higher or lower to get the best devider ratio right? ( ex: higher the multiplier for lower fsb, to link the 1:1 devider for RAM:CPU?)

Performance
On older Intel systems, best performance is achieved through highest possible stable operation in synchronous (1:1) CPU:RAM operation. On such systems, the higher the FSB, the better performance. It is generally best to start with a 1:1 divider and then test other dividers for potentially greater performance.

Newer Intel systems can benefit from a divider that favors the RAM (e.g. 3:4 which means the RAM runs as 4/3 the external clock speed - the CPU always operates at the external clock speed).

Now, with my understanding of this right now, im a bit confused of the link between the RAM speed and the CPU speed. this is my biggest problem.

Lets say i want to OC my old desktop.

2GB DDR2 800
E2200 @ 2,2 Multiplier 11x Clock speed 200 / fsb 50 (?)
If the best devider to start with is 1:1 What speeds should be 1:1?
Ram speed and clock speed? or ram frequency and FSB? i don't really understand this.
And the higher the fsb, the better the performance right? but if its 50, and i change to 55 its a major step! like, 55 x 4 = 220 x 11 = 2,4ghz! thats 200mhz overclock if i only change the FSB by 5! how big are the steps i should take? 1mhz on the fsb? frown.gif because the guide writes that steps of 3-5mhz should be taken

"Increase the external clock speed in small increments. "Small" is relative to the stock speed of the system, though 3-5 MHz is common for Pentiums while 5-10 MHz is common for newer CPUs"

im so confused, please help!
Edited by kehabouter - 7/27/11 at 2:03am
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post #2 of 8
Its the "Quad pumped" thing that's confused you (and me). Your E2200 has an effective (quad pumped) FSB of 800. The real FSB speed (called external clock speed in the guide) is 800/4 = 200.

So as stock speed you have 200FSB x 11multi = 2200MHz = 2.2GHz
Edited by Darren9 - 7/27/11 at 1:51am
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post #3 of 8
Thread Starter 
ah! that clears things up man i really appriciate it!

i was confused so much, because i saw processors with FSB of 700, 800 and then with a multiplier and quad pumped gave it like, 92348290348ghz O.o so thanks! this is one piece i understand smile.gif

/ you are now part of my summary ^^
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post #4 of 8
Yeh I dont understand te quad thing.

Set the FSB:Ram ratio to as high as it will go for the cpu fsb and then with a low multiplier see where the FSB tops out. The start the crank up the multi (and volts)
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by andrewmchugh;14362541 
Yeh I dont understand te quad thing.

Set the FSB:Ram ratio to as high as it will go for the cpu fsb and then with a low multiplier see where the FSB tops out. The start the crank up the multi (and volts)

so if my processor fsb is 200, my ram should also be clocked at 200mhz?
and lets say, i put my multi to 10x and the fsb to 220, to keep the processor at stock speed but for the 1:1 devider. my ram must also be set to 220? and how do i know what the max is of my ram? and how do i know what the stock speed is of my ram? or the current speed? if im using DDR2 800 ram, my ram is 800mhz? i'm not really a RAM guru, RAM speeds are completely unfamiliar with me frown.gif

btw i also added your note to my summary, thanks for your help!
Edited by kehabouter - 7/27/11 at 1:58am
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post #6 of 8
Thread Starter 
I am now reading another guide for RAM also, and i have noticed that the ram speed / 2 = max FSB it can handle.

since i have DDR2 800 – My Max FSB = 400.
But my processor runs at 800 / 4 = 200 FSB so does this means, i have to underclock my ram to get 1:1 ratio? or must i lower my multiplier and hit up my fsb, so i can archieve the 1:1?

now its like, stock at 200 x 11 = 2,2. but this is with a ratio of CPU:RAM 1:2 and i want 1:1.
should i lower multi, to 6 and crank up my fsb to 366mhz
cause 366 x 6 also makes 2,2 (almost, its like 2,196)
and from then, start of upping the multiplier to get stable results?
or am i taking jumps that are too large? because from 366 x 6 to 366 x 7 makes a diffrence of 91FSB wich is quite alot..

please explain
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post #7 of 8
OK can you post all the ratio options that you have? I have a E2200 machine in the house, ill see what that looks like when im back home.
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post #8 of 8
Thread Starter 
i don't know if there are any ratio's available, its just the 1:1 is recommended, so thats why i wanted the 1:1.

everything is stock now, processor is on 2,2ghz. ( 200mhz x 11 )
ram is also stock DDR2-800 so that will be running around 200mhz.
The ram can eat up to 400mhz fsb, so i will be pumping this alot higher.
first my fsb up, multiplier down, and then try upping my vcore, ram voltage, and multiplier

i've seen other E2200's overclocked at 3-3,3ghz. with fsb around 280-285 x11.
so i will start at 244 x 9 and then go up and up untill 2.8 or something smile.gif
Edited by kehabouter - 7/27/11 at 3:21am
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