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How much speed can the PCIbus take?

R

Reap

Member
Right now my system is runing at 160mhz system bus.
I don't got any divider on my motherbord so the PCI bus is runing at 40mhz.
I haven't got any problems with my PCI cards yet.
But I only got a 3com networkcard and a soundblast live!.
Is it risky to run the PCI bus on 40mhz or is it no big deal for the PCI cards to handle?
 
well the sweet spot is 33.3 but to much ouy of wack can mess things up.
i had mine at 41.6 for a while, and it seemed fine. the thing is, you dont just have a soundblaster. the onboard IDE is basically a PCI IDE card soldered to the mobo, so it goes through the pci bus.. too high of a pci speed can sometimes cause data corruption on your hardrive due to this.
 
There were a few articles covering this sort of info at the end of the BX board days when a lot of people were running them at 133FSB with only 1/3 divider. Look around on Anandtech or THG for some of the older articles, you might find some useful stuff. The impression I got was that most AGP/PCI cards ran fine out of spec, but it may be that since the 1/4 divider is now available card manufacturer's aren't testing too far out of spec.
But generally speaking, if it works for you there isn't a nothing to worry about. Except of course for the standard overclocking issue of reducing the overall lifespan of the cards - the harder they work, the sooner they die.
 
I have been running a 42MHz pci bus for some time now. You need a good motherboard and ram to handle it. But then you also need to make sure all of your pci and agp devices are ok with it. The hard drive is important, lots of registry errors can mean that you are pushing it too far. Usually other devices will just give u a crash or lock up. The memory can also screw up Windows registry.
 
Well I got a Abit KR7A-RIAD so I wont use any PCI-IDE controlcards for some time.
The only PCIcard I can think of right now is to get a USB 2.0 card.
The USB card use transfer so can this be bad?

One other question, can a PCIcard burnup do to the high bus?
 
Does the VIO voltage have anything to do with the PCIbus?
If not whats it for?
Default its on 3.50volt
I can set it to 3.65 volt.
 
Yes, the VIO is supplied to the PCI bus, but increasing this seems to affect AGP and RAM more than PCI.

3.65 volts is fairly safe...it's when some people set 3.8 volts or higher you should be worried.
 
I have put the BUS to deafualt again.
So I'm using 12.5x133 (1666mhz) now thanks to that I have unlocked my CPU.
 
My old Celeron 333 @ 416 (83Mhz fsb / 41.5Mhz pci) has been running oc'ed this way since I got it (2 years ago now), and I've never had any troubles with data-corruption. It uses a Western Digital hd, which at that time was supposed to quite oc friendly.
Haven't had any trouble with corruption on my current rig, but that also uses oc-friendly harddrives (IBM Deckstar 60GXP).

millsy, pci-spec is 33Mhz. That means that 133Mhz use a divider of 4, the next divider would be at 166Mhz (166/5=33). 142/4 = 35,5Mhz.
 
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