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PCI-E Bandwidth going from 16x to 1x? WTF?

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March 5, 2008 2:50:45 PM

Intel Quad Core Q6600 @ 3.6GHZ - 1.44v
2GB G.Skill DDR2-800
GA-P35-DS4 rev2 LGA 775 Motherboard
2x 320GB Seagate Barracudas NOT in raid, i just like storage
EVGA nVIDIA Geforce 8800GT 512MB
Windows XP Pro SP2
Antec 900 case
Zalman 97000LE Copper

Thats my setup. I had previously thought this was a side effect of me overclocking and running at 3.6ghz and having some weird problem related to voltages. So I had backed down my Overclock to 3.4ghz and didn't have a problem for a few weeks.

Then yesterday my computer crashed while playing TF2, I rebooted and experienced a video stuttering problem. I opened up CPU-Z and noticed the bandwidth of my 16x PCI-E lane was only running at 1x. A quick reset of the bios and a re-overclock and the problem is no more.

I'm just having a problem with finding out why this is happening? Why is my PCI-E Lane going from 16x to 1x?

More about : pci bandwidth 16x wtf

March 5, 2008 3:51:07 PM

Just a thought, do you have the PCIe frequency locked at 100MHz? It should be alright if left at auto, but set it to 100MHz just in case.
March 5, 2008 6:36:17 PM

Yeah it was locked at 100MHZ and I had it overvolted 1 notch just in case.
I heard if I put it to 101MHZ it would remedy the problem so I'm gonna try that later.
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a b B Homebuilt system
March 5, 2008 7:39:44 PM

@OP: Whats your PSU? It looks like a under powered PSU to me.
a b B Homebuilt system
March 5, 2008 8:09:54 PM

Hmm....the PSU looks good. Whats the BIOS version on the card and the DS4?
March 5, 2008 9:03:51 PM

Newest bios on the card and the motherboard but I customized the bios on the card to have increased voltage so I could overclock it. The problem happend before I customized the bios.
March 5, 2008 10:58:48 PM

You shouldn't have to overvolt the PCIe bus.
March 7, 2008 7:05:08 PM

Well I'm not quite sure but so far I think it has to do with raising the G(MCH) voltage too high. I'll have to do some more testing though.
!