cant oc asus dual p3 mobo

[tdean]

i posted this awhile back but have since done bios upgrade... i have an asus p2b-ds dual p3 mobo. i cant oc it. i just installed new bios (1013) and there are no options for oc'ing. from what i understand, the multiplier is locked? shouldnt i be able to oc this thing? as per usual, any help is greatly appreciated.

i tried Morpheus..... but i didnt inhale....

 

[jclw]

You have to change the jumpers on the board (located up by the memory sockets) to change the FSB. I'd recommend 112FSB.

You can't change the clock multipliers on the CPUs.

- JW

 

[Crashman]

He's right, in case you've been sleeping for the past three years you should know that PII's from 300 up, Celerons, and PIII's are multiplier locked, it doesn't matter what you set the board to, it will always run at the set multiplier, leaving you only the option of raising the bus speed.

What's the frequency, Kenneth?

 

[tdean]

i've been in a coma thanks....

i tried Morpheus..... but i didnt inhale....

 

[Crashman]

If you can find a 133MHz bus speed setting, you can take a PIII 700 (or pair of them) to 933. Or do the same 100 to 133 bus overclock on most slower processors. From the 750 up, it is diffecult to get this 33% overclock, but slower bus speeds are available (for instance, 850's should be able to handle 952MHz at 112FSB).

What's the frequency, Kenneth?

 

[tdean]

i understand that... i just figured id see a different speed reported during post after i switched the fsb. it was set at 3.5 and running @450mhz and i bumped it up incrementally to 6 and it still reads 450mhz at post. there is another set of jumpers labeled "fso, fs1 and fs2" that are all jumped at 1-2. i cant see anything that pertains to them.... an i doing this wrong?

i tried Morpheus..... but i didnt inhale....

 

[Crashman]

Your CPU has a 4.5x multiplier, your bus speed (FS0, FS1, FS2) is set to 100MHz. You can change your bus speed to 112MHz by changing the position of FS1 to pins 2-3, giving you an extra 54MHz (504MHz new speed).

What's the frequency, Kenneth?

 

[tdean]

aaahhhh yes.... i see that now, im sorry. i was confused b/c i changed the mult on the board and didnt see the change during post.... so it doesnt matter if i have that at 4.5 or 6..... i changed the other.... thanks.

i tried Morpheus..... but i didnt inhale....

 

[Crashman]

Yep, you can't change the multiplier no matter how hard you try. There are other settings for your motherboard's bus speed, BTW, that are unlisted, but a few members in here know about them.

What's the frequency, Kenneth?

 

[tdean]

ok, i see. well, maybe some of those members will speak up if they read this. i want to use it as a game/web server periodically, when i get my cable hook up. thanks again for your help.

i tried Morpheus..... but i didnt inhale....

 

[Crashman]

If you really want to speed it up, I suggest two 850E processors at 952MHz, unless you can figure out the high bus speed jumper settings, and want to clock the bus speed higher, in which case two 700's at 933 would be nice. ONe other thing you can do is software overclocking, using SoftFSB, CPUCool, or similar programs to change the bus speed in windows. You won't reach 133FSB with your 450, or with PC100 SDRAM.

What's the frequency, Kenneth?

 

[tdean]

i will look into all those options and will definately post my results. thanks again for your help.

i tried Morpheus..... but i didnt inhale....

 

[jclw]

Crashman: There's something about the onboard SCSI controllers of those boards that doesn't like 133FSB, even with a 1/4 PCI divider. Almost any (later revision) P2B-D will do it, but many people have problems pushing the P2B-DS to 133MHz.

- JW

 

[Crashman]

Hmm, can't figure out that one, it runs on the PCI bus. I heard of problems with the onboard SCSI at 124MHz, which makes sense, but at 133...maybe they don't have a setting that makes the PCI run at 1/4 bus?

What's the frequency, Kenneth?

 

[tdean]

could one of you guys briefly explain that? how do you know what your onboard scsi is running at? why would it work at 124 and not 133? what is 1/4 pci? sorry if i sound dumb.

i tried Morpheus..... but i didnt inhale....

 

[Crashman]

PCI operates at a set fraction of the Front Side Bus (FSB). The BX chipset offers 1/2, 1/3, and 1/4 PCI/FSB dividers, that provide the proper 33MHz PCI clock for 66MHz (1/2x66=33), 100 (1/3x100=33), and 133 (133x1/4=33) processor bus settings.

Most board offer the 1/4 divider only at the 133MHz setting, so at 124MHz, the PCI bus gets overclocked (it's at 1/3x124=41MHz). But at 133, it gets the 1/4 divider, going back to stock PCI bus (1/4x133=33MHz). Under this circumstance, the 133MHz setting is MORE LIKELY TO WORK than the 124MHz setting, because of the lower divider.

But some motherboards do not offer the 1/4 setting, even though it's available to the chipset. Without this setting, 124MHz is more likely to work than 133 because they both get the 1/3 divider.

What's the frequency, Kenneth?