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Oc'ing an underclocked P4 (underclock cause of RAM)

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August 17, 2013 9:14:35 AM

Hi,
I have a P4 3.06Ghz with a 533Mhz FSB that is underclocked to 2.3Ghz because the RAM is only 266Mhz, can I use SetFSB to overclock it?
Will it be safe?
SetFSB link: Ovar here
Mobo link: Ovar here
What are the recommended FSB frequencies?

Thanks ;) 
a b à CPUs
August 17, 2013 9:23:08 AM

There should be adjusting FSB and RAM ratio in BIOS. You can raise FSB and drop that ratio to keep RAM running within specifications.

EDIT: It is the best to use BIOS for overclocking (providing it gives you the options to overclock).
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August 17, 2013 9:25:04 AM

yyk71200 said:
There should be adjusting FSB and RAM ratio in BIOS. You can raise FSB and drop that ratio to keep RAM running within specifications.


yes, I know but I'd like to keep safe
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a b à CPUs
August 17, 2013 9:35:48 AM

You can try to load the optimized defaults in BIOS and see if it will bump your CPU to proper frequencies.
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August 17, 2013 9:37:59 AM

yyk71200 said:
You can try to load the optimized defaults in BIOS and see if it will bump your CPU to proper frequencies.


ok thanks, I'll try later. Maybe some setting may be optimized because I upgraded the PC, maybe the speeds are set incorrectly. I'll be sure to give you "best solution" even if I get even 0.1Ghz
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August 17, 2013 9:53:28 AM

One more thing: you download CPU-Z, and see if your motherboard properly recognizes CPU. If it does not (i.e. wrong or unrecognized cpu name/model), your current BIOS does not support CPU properly. Than you can either update BIOS (potentially risky, and you'll need floppy drive), or leave things like they are. Most likely your BIOS will recognize the CPU though.
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a b K Overclocking
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August 17, 2013 10:14:03 AM

From what I can find out about the processor, it sounds like your front side bus speed is too low. The Pentium 4 uses a FSB that is 4 times the motherboard's bus speed, by performing 4 data transfers every clock cycle. Your specific processor uses a multiplier of 23x the motherboard speed, which if the motherboard speed is at 100 MHz, will run the processor at 2.3 GHz. A motherboard bus speed of 133 MHz will give you a CPU FSB speed of 533 MHz (133 x 4), and a memory speed of 266 (DDR memory runs at double the motherboard speed).

In the BIOS, under the "CPU PnP Setup" page, make sure that the CPU and DRAM frequency settings are at 133.

Casey
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a b K Overclocking
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August 17, 2013 12:36:19 PM

Daniel120201 said:
Hi,
I have a P4 3.06Ghz with a 533Mhz FSB that is underclocked to 2.3Ghz because the RAM is only 266Mhz, can I use SetFSB to overclock it?
Will it be safe?
SetFSB link: Ovar here
Mobo link: Ovar here
What are the recommended FSB frequencies?

Thanks ;) 


cklaubur has the right idea. Set the FSB to 533 and the RAM to 266 and you will be good. If your board is obtuse (it is an ECS, so very possible), the raw figures are an FSB clock of 133 MHz and a DRAM:FSB strap of 1:1.

Probably what happened is that you have your RAM speed set to DDR-333 in the BIOS. A DRAM strap of 5:4 with a 133 MHz FSB yields a 166 MHz clock speed for DDR-333. DDR-266 like you have will be unlikely to run stable at DDR-333 speeds so you dropped the FSB down to a 100 MHz clock which underclocked your CPU to 2.30 GHz. That 5:4 DDR-333 strap makes your RAM run at 125 MHz (DDR-250) or just a few ticks off of stock so it works fine. You need to set the strap at 1:1 and then you can return your CPU to its normal clock speed.

Lastly, that 3.06/533 FSB chip you have was a very famous, expensive chip in its day. It was the first desktop chip to cross the 3 GHz barrier, the first one to use the 533 MHz FSB, and the first desktop chip with HyperThreading. It was an expensive sucker back in its day with roughly a $1k price tag.
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August 17, 2013 1:48:15 PM

MU_Engineer said:
Daniel120201 said:
Hi,
I have a P4 3.06Ghz with a 533Mhz FSB that is underclocked to 2.3Ghz because the RAM is only 266Mhz, can I use SetFSB to overclock it?
Will it be safe?
SetFSB link: Ovar here
Mobo link: Ovar here
What are the recommended FSB frequencies?

Thanks ;) 


cklaubur has the right idea. Set the FSB to 533 and the RAM to 266 and you will be good. If your board is obtuse (it is an ECS, so very possible), the raw figures are an FSB clock of 133 MHz and a DRAM:FSB strap of 1:1.

Probably what happened is that you have your RAM speed set to DDR-333 in the BIOS. A DRAM strap of 5:4 with a 133 MHz FSB yields a 166 MHz clock speed for DDR-333. DDR-266 like you have will be unlikely to run stable at DDR-333 speeds so you dropped the FSB down to a 100 MHz clock which underclocked your CPU to 2.30 GHz. That 5:4 DDR-333 strap makes your RAM run at 125 MHz (DDR-250) or just a few ticks off of stock so it works fine. You need to set the strap at 1:1 and then you can return your CPU to its normal clock speed.

Lastly, that 3.06/533 FSB chip you have was a very famous, expensive chip in its day. It was the first desktop chip to cross the 3 GHz barrier, the first one to use the 533 MHz FSB, and the first desktop chip with HyperThreading. It was an expensive sucker back in its day with roughly a $1k price tag.


Thanks, can you tell me exactly a bit what to do in the BIOS? To make your life easier: this is the link to the manual

Yeah, thanks very much ;) 
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August 18, 2013 6:22:53 AM

Can anybody tell me the exact settings?
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a b K Overclocking
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August 18, 2013 6:37:32 AM

Here's what you do:

1. Hit the Delete key just after switching the computer on to enter the BIOS.

2. Tab/arrow key over to the "CPU PnP Setup" menu once the main BIOS page has appeared. The CPU and memory clock speeds should show up (see page 35 of the manual.) Note that ECS uses the actual clock speed (100 MHz, 133 MHz) rather than the "effective" clock speed (400 MHz FSB, DDR-266).

3. You want to see the following values in the CPU PnP Settings page:
CPU Type: Intel P4 (you can't change this)
CPU/DRAM speed: 133/133 MHz
CPU Core Voltage: somewhere between 1.55 and 1.62 volts, don't change this
CPU Ratio: The documentation is not very good but I think this refers to the CPU multiplier, which in your case should be 23x. I'd leave this at "Auto" or "HW."
CPU frequency: 133 MHz
DRAM frequency: 133 MHz

If those are not set correctly, change them in the BIOS if you can. Your board does not *appear* to use jumpers for setting FSB clock and RAM speeds although the manual is very, very poor about discussing this issue.
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August 18, 2013 6:40:32 AM

MU_Engineer said:
Here's what you do:

1. Hit the Delete key just after switching the computer on to enter the BIOS.

2. Tab/arrow key over to the "CPU PnP Setup" menu once the main BIOS page has appeared. The CPU and memory clock speeds should show up (see page 35 of the manual.) Note that ECS uses the actual clock speed (100 MHz, 133 MHz) rather than the "effective" clock speed (400 MHz FSB, DDR-266).

3. You want to see the following values in the CPU PnP Settings page:
CPU Type: Intel P4 (you can't change this)
CPU/DRAM speed: 133/133 MHz
CPU Core Voltage: somewhere between 1.55 and 1.62 volts, don't change this
CPU Ratio: The documentation is not very good but I think this refers to the CPU multiplier, which in your case should be 23x. I'd leave this at "Auto" or "HW."
CPU frequency: 133 MHz
DRAM frequency: 133 MHz

If those are not set correctly, change them in the BIOS if you can. Your board does not *appear* to use jumpers for setting FSB clock and RAM speeds although the manual is very, very poor about discussing this issue.


Ok thanks, with these settings I'll get 3.06Ghz?
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a b K Overclocking
a c 99 à CPUs
August 18, 2013 11:27:47 AM

Daniel120201 said:

Ok thanks, with these settings I'll get 3.06Ghz?


You should.
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August 18, 2013 11:30:11 AM

MU_Engineer said:
Here's what you do:

1. Hit the Delete key just after switching the computer on to enter the BIOS.

2. Tab/arrow key over to the "CPU PnP Setup" menu once the main BIOS page has appeared. The CPU and memory clock speeds should show up (see page 35 of the manual.) Note that ECS uses the actual clock speed (100 MHz, 133 MHz) rather than the "effective" clock speed (400 MHz FSB, DDR-266).

3. You want to see the following values in the CPU PnP Settings page:
CPU Type: Intel P4 (you can't change this)
CPU/DRAM speed: 133/133 MHz
CPU Core Voltage: somewhere between 1.55 and 1.62 volts, don't change this
CPU Ratio: The documentation is not very good but I think this refers to the CPU multiplier, which in your case should be 23x. I'd leave this at "Auto" or "HW."
CPU frequency: 133 MHz
DRAM frequency: 133 MHz

If those are not set correctly, change them in the BIOS if you can. Your board does not *appear* to use jumpers for setting FSB clock and RAM speeds although the manual is very, very poor about discussing this issue.


MU_Engineer said:
Daniel120201 said:

Ok thanks, with these settings I'll get 3.06Ghz?


You should.


Ok, thanks, I'll try ASAP. Thank you very much, I'll chose your solution when I test it ;) 
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August 19, 2013 5:40:05 AM

MU_Engineer said:
Here's what you do:

1. Hit the Delete key just after switching the computer on to enter the BIOS.

2. Tab/arrow key over to the "CPU PnP Setup" menu once the main BIOS page has appeared. The CPU and memory clock speeds should show up (see page 35 of the manual.) Note that ECS uses the actual clock speed (100 MHz, 133 MHz) rather than the "effective" clock speed (400 MHz FSB, DDR-266).

3. You want to see the following values in the CPU PnP Settings page:
CPU Type: Intel P4 (you can't change this)
CPU/DRAM speed: 133/133 MHz
CPU Core Voltage: somewhere between 1.55 and 1.62 volts, don't change this
CPU Ratio: The documentation is not very good but I think this refers to the CPU multiplier, which in your case should be 23x. I'd leave this at "Auto" or "HW."
CPU frequency: 133 MHz
DRAM frequency: 133 MHz

If those are not set correctly, change them in the BIOS if you can. Your board does not *appear* to use jumpers for setting FSB clock and RAM speeds although the manual is very, very poor about discussing this issue.


Hey, it worked, but however I can only push it up in increments of 33mhz, I'd like to Oc the system to maybe 3.2Ghz, how can I do it? Will setFSB do the job?
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September 8, 2013 11:03:03 PM



A word of warning here....if you can Overclock your CPU, be aware of the Northwood Sudden Death Syndrome...maybe you got the Prescott, but this should be worth researching for you......With Northwood CPUs, any OC over 1.75V can cause an electron voltage "leak", which sets up a circuit pattern inside the CPU to effectively short it out. Even if you OC once , the path can set up and the Cpu could be affected by going into a slow death spiral until it won't boot at all. The process can takes days or weeks. Just a heads up.
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