BX mobo @ 133 MHz FSB

[Wunder]

Hey all.
Before i run and buy a P3 700 (or a 750) and oc to 133 MHz FSB i need to clear some things up. Me got a BX mobo, so upping the fsb would make my buses running out of spec. The thing is my PCI divider cant be set to 1/4, so they will run at 44 MHz. What are the chances of getting a stable system with this speeded PCI bus?
sysinfo:
mobo: Siemens Nixdorf D1064
RAM: 2*64 PC133
AGP: Radeon VIVO
PCI: SMC EZ card 10/100, Soundblaster 128

 

[Chrisramseyer]

I have an Epox BX7+100 that runs fine at 150 FSB, actually i have had 5 out of 5 of them that ran at that speed. It just depends on what kind of Mobo you have. If you have a 100 to spend you should get one of these boards. Forget the 815 and the VIA stuff.

 

[[OC]Lucifer]

I agree. BX's rool, Via's drool. But Im sorry to inform you unless you buy used, you wont be able to get a P3-700. They are discontinued.

 

[logos]

can you flash the latest bios? pIII 700 runs at 100fsb anyway, but if you can't flash the bios to get 1/4 and run at 133 anyway the bx chipset is more stable out of spec than others, imho

 

[Wunder]

Already got the latest BIOS, and it doesn't support 1/4 divider. And i don't wanna change mobo either. So my question is this: What are my chances of getting a stable system @ 44 MHz PCI???

 

[Placid]

What pci cards do you use?
Just the ethernet and the sb 128?
If you have a 66mhz fsb cpu now and your motherboard lets you use a fsb of 83 then that would run the pci bus at 41.
Not 44 but close. If you have a 100mhz fsb cpu now maybe you can force it to run at 83.

Without even getting into what type of hard drive you are using I would say a 90% chance it will not work.

 

[Mictlan]

You need the 1/4 PCI divider. Most PCI boards don't run at 44 MHz. If you can't get the divider at you BIOS, try d/l SoftFSB or CPUFSB. You'll need to check your PLL (clock generator). Look at your mobo, next to a silver bump there's the PLL. Write down the manufacturer and the serial number. Then check in the sites of this two programm developers if they support your PLL.

If your PLL is supported and is recent (about two years), chances are that your PLL supports a 1/4 PCI divider. Just install the software, type your PLL, and change your settings.

If you have a well known mobo (Asus, Abit) this programs have a good databank, so you only have to select your mobo.

Happy OC

 

[Wunder]

The mobo has NO way of changing FSB. It chooses automatically between 66 and 100 MHz. Manual changing between 66, 100 and 133 can only be done on the slotket or by pincovering.

The mobo does NOT support any kind of software tools for setting FSB. It has 2 pll chips:

IMI
SG577DYB
9822 F4765

and

IMI
SC680EYB
9825 F4836

I have read on the CPUFSB site that these pll chips does not allow any software tweaking at all. Therefore im stuck with plain old hardware settings...

 

[bdf24]

Yes I can almost garuntee that with you PCI bus running at 44mhz it will not work! Even if you got into windows you run a very good chance of data corruption.

On my BE6-II even with a PCI bus of 41mhz I have problems. System either wont post when I reboot or it brings up Bios checksum errors at bootup. But at a cold boot it will get into windows. Though it will cause errors while burning cd's. So I have to have the 1\4 PCI divider to even run a FSB of 124mhz stable.

 

[Wunder]

Damned...

ill try and borrow a 133 MHz FSB processor and test it.
if it aint workin me change mobo.

 

[klosters64a]

44 Mhz PCI bus is generally impossible.

 

[LesterP]

what the folks said is the sad truth. you would enter the wonderful world of data corruption as your hdds among other things would take a big crap. 41mhz on the pci bus is about as high as you want to go and even then i wouldn't do it unless you don't give a ... about your data or random acts of instability.