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PCI Parity Error

Last response: in Overclocking
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September 21, 2010 6:55:34 PM

Hi

I'm not sure if I've posted in the right category but I'm having trouble with my computer. When I orignally built the computer I kept getting PCI Parity Error whenever I turned on the PC but for some reason when I re-installed Windows XP it went away for a while. On sunday I started to get the error again and everytime I turned it on the error would appear 3-5 times before it would boot into Windows. Now it will no longer boot into Windows but the BIOS logo still shows. My motherboard is a Gigabyte X38-DQ6 if that helps. I have tried clearing CMOS but no luck I have tried to boot from disc and make sure the Hard Drives are OK but still no luck. It may even be as simple as changing a value of something in the MB Intelligent Tweaker since the it is overclocked. Is the motherboard on it's way out?

Thanks in advance

More about : pci parity error

a b K Overclocking
September 21, 2010 7:41:28 PM

It could be a lot of things.... disconnect all pci cards that you are not using. do you have a different video card to try. Download and run memtest over night.
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September 22, 2010 10:37:04 AM

I have tried another video card but still had the same problem. I'll try memtest when I can get it boot from CD. Do you think reseting the bios will work?

Thanks
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a c 197 K Overclocking
September 22, 2010 12:35:17 PM

I think your motherboard has failed.

Your PCI bus slots are wired to an 8 bit parallel data bus. The basic way to constantly monitor this is to add a nineth bit. Then the circuits that put the data on the bus count the number of bits in the word and if it is an even number of bits usually adds a parity bit so the word contains an odd number of bits. This is called "odd parity". Even parity can be used, the the usual convention is odd. Then once the data arrives, it's checked. If you picked up or lost a bit, the system flags an error.

Yes, there's an obvious flaw in the system. What if you pickup or lose two bits? Parity checking will not be able to detect that. A more complex ( read expensive) system can correct a single bit error and detect a 2 bit error.

You have this system for the PCI bus, but not the PCIe bus. Remember, PCI Express is basically a serial bus



Google "parity error" or "parity checking".
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September 22, 2010 2:30:25 PM

So is there any chance of fixing this?

Thanks
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a c 197 K Overclocking
September 23, 2010 7:23:56 PM

I don't think so. About all I know of is don't use the PCI bus.
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October 3, 2010 8:31:59 AM

Best answer selected by Jboyinabox.
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