Unlocking the FSB Multiplier

[THe NuTTeR]

Is there any way to unlock the FSB multiplier on a PIII 550 (currently running at 100MHz FSB). I think it is a OEM chip, as I bought the system from a computer building shop, and there was no box for the processor, but boxes for everything else.
I know the FSB multiplier can be unlocked on AMD chips, but can I do it on this?
THe NuTTeR

Current Setup:
PIII 550
3C509 ISA NIC
Cheap modem
ECS P6BXT-A+ Mainboard
Dual Monitor/Graphics Card: S3 Trio3D/2X AGP & Cirrus Logic 5446 PCI
15GB Quantum HDD
LG 48x CDROM

[Dark Druid]

THe NuTTeR (Mar 27, 2001 06:57 a.m.):
Is there any way to unlock the FSB multiplier on a PIII 550 (currently running at 100MHz FSB). I think it is a OEM chip, as I bought the system from a computer building shop, and there was no box for the processor, but boxes for everything else.
I know the FSB multiplier can be unlocked on AMD chips, but can I do it on this?
THe NuTTeR

Current Setup:
PIII 550
3C509 ISA NIC
Cheap modem
ECS P6BXT-A+ Mainboard
Dual Monitor/Graphics Card: S3 Trio3D/2X AGP & Cirrus Logic 5446 PCI
15GB Quantum HDD
LG 48x CDROM

Well to start with, you are reffering to the actual Multiplier, of 5.5 not the FSB.

Your system takes the FSB of 100mhz and applies the multiplier of 5.5 to it and achives the 550mhz that your cpu is rated at.

As for the AMD's that is what gets unlocked with the pencil trick, not the FSB.

As for the Intel... Sorry but no go, you can not unlock the multiplier, you are stuck at 5.5x

But if your motherboard is any good, you should have selections for the FSB of 100/112/133 or, 100/101/102...150 (in 1mhz steps)

Lets assume (sic) that you have the first type, only lets you jump from 100 to 112.

You will not have to do anything to your cpu, just boot up and enter cmos.

Your current settings are, 5.5x multiplier, 100fsb = 550mhz
now change the FSB to 112, (the multiplier does nothing even if you can change it, its locked).

Reboot and you should see the mzh rating at 616mzh

go into windows (or Linux) have your motherboard monitors setup (what ever you use) and start loading up the cpu REAL heavy.

What I like to do, is I have some old files that are 128megs in size, I zip up 4 of them (2x my physical ram) and unzip then with CRC checking, in a loop via a batch file.

With that running in the back ground, I start up SiSoft Sandra 2001 and do a cpu/mem burn in loop.

then I start up my CD player and jam to some tunes with Windows media player doing the lighting effects.

This gets the CPU cooking in my case (yours might be differant)

The zip files doing the CRC checks makes sure that my ATA and MEM are good to go.

If you are happy with your temp's after a few hours (6-12) and think you could handle somemore, reboot and crank the FSB up to 124.

Reboot and you should see 682mhz (+/- 1-2mhz) and do it all again.

You should go check out some of the websites that explain the BOIS settings in detail and go through your bios with a fine tooth comb changing 1 setting at a time and testing your system for stablilty and performance.

Hope that helps.

Just remember on the intel you can NOT unlock the multiplier but you can adjust the FSB. on an AMD you can adjust both if you unlock the cpu.

peace

(Yeah I know I will get some flames about some errors, but hey, that system works for me (I think heeheh))

[THe NuTTeR]

Thanks, I have previously overclocked by adjusting the FSB and my mb will do 100/103/112/133, I managed to run at 112FSB but was told that it totally F***s the AGP/PCI timings and shouldn't do it. So i undid it.
How much difference does it really make?
THe NuTTeR

[The Stickie]

It does f# the PCI/AGP/... timings up, but no harm done if your devices take it... that's just why you should check everything with a high load...

Makin ZIP's and unzipping them is a great way to controle your systems integrity: if something goes wrong no matter what (calculation error, write/read error, ...) you should notice it: your zip will be messed up...
I use a scipt for this: It sends a file(200MB) over the network to the overclocked pc, this one receives it, zip/unzips it several times (about 20 times with CRC check) and sends it back. It also rips a audio CD to mp3, and 3dmark99 in the same time.
So: 3Dmark shouldn't crash, the file should be ok and the music should run fine....if it doesn't there is something wrong...

[engjohn]

The Stickie (Mar 27, 2001 11:40 a.m.):
It does f# the PCI/AGP/... timings up, but no harm done if your devices take it... that's just why you should check everything with a high load...

Makin ZIP's and unzipping them is a great way to controle your systems integrity: if something goes wrong no matter what (calculation error, write/read error, ...) you should notice it: your zip will be messed up...
I use a scipt for this: It sends a file(200MB) over the network to the overclocked pc, this one receives it, zip/unzips it several times (about 20 times with CRC check) and sends it back. It also rips a audio CD to mp3, and 3dmark99 in the same time.
So: 3Dmark shouldn't crash, the file should be ok and the music should run fine....if it doesn't there is something wrong...

Would you mind shareing that script with the rest of us, so that we all do not have to re-write the same script... Of course we will all give you credit for it....

[mordy]

Originally posted by THe NuTTeR
Thanks, I have previously overclocked by adjusting the FSB and my mb will do 100/103/112/133, I managed to run at 112FSB but was told that it totally F***s the AGP/PCI timings and shouldn't do it. So i undid it.
How much difference does it really make?
THe NuTTeR
I use the same board, at 112MHZ fsb. no problems at all, stable. If it gives you problems at that speed check the cooling first. I had problems with 103 mhz, floppy didn't work. I thought it was because the overclocked bus, but i changed the cpu, and now it worx. But it won't make 133...

[Rio71]

Unlocking the FSB Multiplier
Yes... all go, no Quit...here (http://www.dwpg.com/content.php?contid=2&artid=89) :D

[TASOS]

Originally posted by Rio71

Yes... all go, no Quit...here (http://www.dwpg.com/content.php?contid=2&artid=89) :D


:D :D :D
That's an excellent article Rio