Pentium 4 Overclocking

SatsukiMikata · Jun 29, 2006, 07:59 PM

Hello!

I would like to overclock my CPU. The Multiplier is locked at 22, and the FSB is at 100Mhz.

Pentium 4 2.2ghz S478/433mhz/L2 512kb
2 x 512Mb DDR333 (I think running at 200Mhz)
My mainboard: http://www.msicomputer.com/product/p...2-LSR&class=mb

If I were to raise the FSB too 133 would my other system devices work properly and with stablity? Will the clock speeds for the PCI and AGP buses stay at their coresponding clocks? Will this riase my RAM speed to 333mhz? I have a copper cooling system that should be able to handle the heat.

133 x 22 = 2926 = 2.9Ghz

Thanks,
-Satsuki

kn00tcn · Jun 30, 2006, 10:11 AM

what are your cpu temps right now

CDsDontBurn · Jun 30, 2006, 10:20 AM

one thing you have to be weary of is your PCI/AGP bus clocks as you have mentioned. make sure they stay at 33/66 otherwise you'll have device instability or system instability. some MoBos also have a feature that will allow you to lock the bus PCI/AGP bus no matter what FSB you run the CPU. it's usually called something like "PCI/AGP lock".

OCing is something you want to do gradually. you do not want take it to it's max on the first time. you want to increase the speed by a few Mhz at a time until your system is no longer stable at the clock speeds you have reached.

also, as you increase your clock speeds, you also want to increase your voltages on both memory and CPU. but be sure not to over volt your hardware, as it will also be a reason for it to fail aside from OCing only.

dunno what else to say. just ask, and i know somebody will help you

kn00tcn · Jun 30, 2006, 10:54 AM

shouldnt it be, increase fsb untill you cant boot, then raise the voltage of the item in question (cpu) & try to boot

& the agp/pci speeds go up from the fsb?? werent they always a separate setting?

CDsDontBurn · Jun 30, 2006, 10:57 AM

Quote:

Originally Posted by kn00tcn

shouldnt it be, increase fsb untill you cant boot, then raise the voltage of the item in question (cpu) & try to boot

& the agp/pci speeds go up from the fsb?? werent they always a separate setting?

basically that's how it's done. however, i don't keep at it until i can't boot anymore, i keep increasing the FSB until my system is no longer stable, and i increase the voltage by .25v~.5v

some MoBos have the PCI/AGP lock in the BIOS so you can manually lock it to prevent that bus speed from increasing on it's own.

Asmoday · Jun 30, 2006, 12:14 PM

And remember to keep your RAM on a divider in case it can't take the high FSB...

CDsDontBurn · Jun 30, 2006, 01:24 PM

Quote:

Originally Posted by Asmoday

And remember to keep your RAM on a divider in case it can't take the high FSB...

why would that be important even if it is DDR266? or is it for the CPU to be able to handle the high OC?

lol......i have to ask because i always keep it on the 1:1 divider, nothing else

Asmoday · Jun 30, 2006, 01:34 PM

Quote:

Originally Posted by CDsDontBurn

why would that be important even if it is DDR266? or is it for the CPU to be able to handle the high OC?

lol......i have to ask because i always keep it on the 1:1 divider, nothing else

Well, don't the RAM bus speed increase along with the FSB? Atleast it did back when I had ny Northwood on a IC7 mobo. I'm not sure if there's an auto option for the RAM on some motherboards that keeps the RAM at default speed.

CDsDontBurn · Jun 30, 2006, 07:30 PM

Quote:

Originally Posted by Asmoday

Well, don't the RAM bus speed increase along with the FSB? Atleast it did back when I had ny Northwood on a IC7 mobo. I'm not sure if there's an auto option for the RAM on some motherboards that keeps the RAM at default speed.

well, seeing that i still have that MoBo, that's how i know how it works still. increase ram speed = increase FSB = increase CPU speed.

so how does the divider work exactly? all i know is that by using the divider, you're either running the RAM faster than the FSB of the CPU, or you're running the FSB of the CPU faster than the RAM.

MiDri · Jun 30, 2006, 09:09 PM

Quote:

Originally Posted by CDsDontBurn

well, seeing that i still have that MoBo, that's how i know how it works still. increase ram speed = increase FSB = increase CPU speed.

so how does the divider work exactly? all i know is that by using the divider, you're either running the RAM faster than the FSB of the CPU, or you're running the FSB of the CPU faster than the RAM.

Divider just divides the FSB to get diffrent speeds.

A divider takes your fsb and divides it to get clocks of stuff. Lets say you have a fsb of 200, if your running memory that is rated for 200 you can run it with a divider of 1:1. If your running a 100 fsb and using memory rated at 200 you will want to run a divider of 2:1.

My best examples are for AMD64 200fsb machines, sense that is what I normaly work with.

Example:

CPU is running at 2.5ghz
Memory is running at 125mhz
and FSB is running at 250...

To find out what dividers I am using you do a little math:
FSB / DIVIDER = SPEED, so we take 250 / X = 2,500 that shows that my divider is at 10.

To get my memory's divider we do the same 250 / X = 125 (hint, hint it's 2)

[edit]
Technicly, it is more complicated on AMD64 system. AMD64 have memory controlers on the CPU instead of the MOBO and as a result your memory speed is based off your cpu clock speed. So my memory divider is actully 2,500 / X = 125, which is 20. Another easy way to do AMD64 mem divider is what ever the divider would be on a normal system * divider of the processor.

CDsDontBurn · Jun 30, 2006, 09:22 PM

Quote:

Originally Posted by MiDri

Divider just divides the FSB to get diffrent speeds.

A divider takes your fsb and divides it to get clocks of stuff. Lets say you have a fsb of 200, if your running memory that is rated for 200 you can run it with a divider of 1:1. If your running a 100 fsb and using memory rated at 200 you will want to run a divider of 2:1.

My best examples are for AMD64 200fsb machines, sense that is what I normaly work with.

Example:

CPU is running at 2.5ghz
Memory is running at 125mhz
and FSB is running at 250...

To find out what dividers I am using you do a little math:
FSB / DIVIDER = SPEED, so we take 250 / X = 2,500 that shows that my divider is at 10.

To get my memory's divider we do the same 250 / X = 125 (hint, hint it's 2)

[edit]
Technicly, it is more complicated on AMD64 system. AMD64 have memory controlers on the CPU instead of the MOBO and as a result your memory speed is based off your cpu clock speed. So my memory divider is actully 2,500 / X = 125, which is 20. Another easy way to do AMD64 mem divider is what ever the divider would be on a normal system * divider of the processor.

yea, but it's different on an intel machine, which is what i work with when OCing.

MiDri · Jun 30, 2006, 09:31 PM

Dividers work the same on all machines. I just went into more detail on the AMD64, because that is what I play with on a daily bases.

Everything that uses timing on the board uses the FSB for timing, and a divider to get specific time it needs. For example your PCI cards get their 33mhz by taking the 100mhz fsb and using a /3 divider. The AGP slot uses a /1.5 divider. Motherboards that let you lock the PCI and AGP often times bypass the FSB to get those values, however; and isntead have a direct link to the same crystal (with their own dividers) that the FSB gets it's mhz from.

CDsDontBurn · Jun 30, 2006, 09:38 PM

i dunno about the new 775 chips, but on the 478s, all you had to do was just increase the RAM speed and that's it

. well, obviously the memory timings and voltages were important, but now, it's a bit more complicated it seems w/the 775s as they have an unlocked multiplier, or am i wrong about that part?

NUCLEARWINTER · Jun 30, 2006, 10:26 PM

i have an lga 775 mobo. and how the dividers for my board are set up by the ram speeds. the ratios correspond with what percentage of ur increased FSB goes to ur cpu, and how much goes to ur ram. for DDR400 the ratio is 1:1 for ddr533 it's a 3:4 cpu-ram ratio. and for ddr600 it's 2:3 cpu-ram ratio. but this may be specific for my board. but that is how they work.

Jun 29, 2006, 07:59 PM	#1
SatsukiMikata DriverHeaven Junior Member Join Date: Apr 2006 Location: Pennsylvania, USA Posts: 38 Rep Power: 0	Pentium 4 Overclocking Hello! I would like to overclock my CPU. The Multiplier is locked at 22, and the FSB is at 100Mhz. Pentium 4 2.2ghz S478/433mhz/L2 512kb 2 x 512Mb DDR333 (I think running at 200Mhz) My mainboard: http://www.msicomputer.com/product/p...2-LSR&class=mb If I were to raise the FSB too 133 would my other system devices work properly and with stablity? Will the clock speeds for the PCI and AGP buses stay at their coresponding clocks? Will this riase my RAM speed to 333mhz? I have a copper cooling system that should be able to handle the heat. 133 x 22 = 2926 = 2.9Ghz Thanks, -Satsuki

Jun 30, 2006, 10:11 AM	#2
kn00tcn DriverHeaven Senior Member Join Date: Jun 2006 Location: Toronto Posts: 649 Rep Power: 0 System Specs	what are your cpu temps right now __________________ http://www.kn00tcn.net/site/ati-catalyst-profiles/ http://www.kn00tcn.net/FPSLimiter.rar

Jun 30, 2006, 10:20 AM	#3
CDsDontBurn Lurking DriverHeaven Join Date: May 2003 Location: Southern California Posts: 22,790 Rep Power: 235 System Specs	one thing you have to be weary of is your PCI/AGP bus clocks as you have mentioned. make sure they stay at 33/66 otherwise you'll have device instability or system instability. some MoBos also have a feature that will allow you to lock the bus PCI/AGP bus no matter what FSB you run the CPU. it's usually called something like "PCI/AGP lock". OCing is something you want to do gradually. you do not want take it to it's max on the first time. you want to increase the speed by a few Mhz at a time until your system is no longer stable at the clock speeds you have reached. also, as you increase your clock speeds, you also want to increase your voltages on both memory and CPU. but be sure not to over volt your hardware, as it will also be a reason for it to fail aside from OCing only. dunno what else to say. just ask, and i know somebody will help you __________________ Her First Day \| A year later

Jun 30, 2006, 10:54 AM	#4
kn00tcn DriverHeaven Senior Member Join Date: Jun 2006 Location: Toronto Posts: 649 Rep Power: 0 System Specs	shouldnt it be, increase fsb untill you cant boot, then raise the voltage of the item in question (cpu) & try to boot & the agp/pci speeds go up from the fsb?? werent they always a separate setting? __________________ http://www.kn00tcn.net/site/ati-catalyst-profiles/ http://www.kn00tcn.net/FPSLimiter.rar

Jun 30, 2006, 12:14 PM	#6
Asmoday Demonic Join Date: May 2002 Location: In the cold, dark north... Posts: 5,198 Rep Power: 92 System Specs	And remember to keep your RAM on a divider in case it can't take the high FSB... __________________ How You can help Hardwareheaven by using Digg

Jun 30, 2006, 09:31 PM	#12
MiDri DriverHeaven Senior Member Join Date: Jul 2005 Posts: 930 Rep Power: 0	Dividers work the same on all machines. I just went into more detail on the AMD64, because that is what I play with on a daily bases. Everything that uses timing on the board uses the FSB for timing, and a divider to get specific time it needs. For example your PCI cards get their 33mhz by taking the 100mhz fsb and using a /3 divider. The AGP slot uses a /1.5 divider. Motherboards that let you lock the PCI and AGP often times bypass the FSB to get those values, however; and isntead have a direct link to the same crystal (with their own dividers) that the FSB gets it's mhz from. __________________ [COLOR=Red] [COLOR=black]He is so happy, I just don't have the heart to tell him...[/COLOR][/COLOR] Last edited by MiDri; Jun 30, 2006 at 09:38 PM.

Jun 30, 2006, 09:38 PM	#13
CDsDontBurn Lurking DriverHeaven Join Date: May 2003 Location: Southern California Posts: 22,790 Rep Power: 235 System Specs	i dunno about the new 775 chips, but on the 478s, all you had to do was just increase the RAM speed and that's it . well, obviously the memory timings and voltages were important, but now, it's a bit more complicated it seems w/the 775s as they have an unlocked multiplier, or am i wrong about that part? __________________ Her First Day \| A year later

Jun 30, 2006, 10:26 PM	#14
NUCLEARWINTER Reap What You Sow. Join Date: Jul 2005 Location: Louisville, Kentucky Posts: 1,135 Rep Power: 65 System Specs	i have an lga 775 mobo. and how the dividers for my board are set up by the ram speeds. the ratios correspond with what percentage of ur increased FSB goes to ur cpu, and how much goes to ur ram. for DDR400 the ratio is 1:1 for ddr533 it's a 3:4 cpu-ram ratio. and for ddr600 it's 2:3 cpu-ram ratio. but this may be specific for my board. but that is how they work. __________________ insert witty comment here!