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8800GTS 640MB Running in PCIE x8?!

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March 31, 2007 6:56:14 PM

Ok, so I recently switched out my Intel 925 motherboard for an ASUS P5N-E SLI. On the Intel 925, my 8800GTS 640mb ran in PCIE x16. But, when I put it on the P5N-E, my control panel says it's running in PCIE x8.

The ASUS P5N-E SLI is known for its notorious dual-card function to disable and enable SLI, as shown in this picture:


Right now, it's "supposedly" set for single-card setup.

This is what CPU-Z is telling me:


I've mailed ASUS and all they told me to do was to update the BIOS...but I already have the latest, so I just reflashed the BIOS and...nothing. Still running at 8x.

Nvidia Control Panel is also recognizing it in x8, and in a non-SLI setup.

(Oh, and when I was setting up my computer, I noticed a little chip on the connector. Seems like one of them had its connector half gone, but it still works, and it seems like most PCIE x16 cards have the same chipped connector. Hmm...)
Help? :cry: 
March 31, 2007 8:31:38 PM

Try clearing the CMOS
March 31, 2007 8:33:23 PM

First;you won't have a performance problem running at 8x.Second,you might try going into your bios and changing your pci-x speed to 16x from 8x,or it may be called pci-x width.Goodluck.

Dahak

AMD X2-4400+@2.6 TOLEDO
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2X EVGA 7950GT KO IN SLI
4X 512MB CRUCIAL BALLISTIX DDR500
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ACER 22IN WIDESCREEN LCD 1600X1200
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March 31, 2007 8:54:09 PM

I've looked all around the BIOS and there isn't a control for it. Guess that's why they're using the card.

There is a performance loss when running in 8x. I think there's a stickied thread here about PCIE speeds and the performance differences.

I'll check the BIOS again, if not, I'll see if the card is in firm position, and check if I put my card in the right slot.

I'm pretty sure the video card is in the right slot, the manual says to place the card in the blue slot.

We'll see :|

And what's clearing the CMOS?
March 31, 2007 10:05:31 PM

Clearing the CMOS

in other words, reset the BIOS.

Turn on the PC with the BIOS pins configured as RESET or just take out the battery for 10 mins.
March 31, 2007 10:06:17 PM

Well, eh. I just went in and did.

-SLI-Card Reseat = FAIL
-SLI-Card Swap = FAIL
-Load BIOS Defaults = FAIL
-Remove SLI-Card = FAIL (Started running my card in PCIE x1 8O )

What gives?! Did I get a bad mobo, or am I just stupid? Guess I'll have to wait for slow-SUS to respond...
March 31, 2007 10:15:59 PM

Ok, let's deconstruct the problem step by step.

1. It isn't the video card. You already found that the card properly syncs up to x16 SLI. If you wanted to be really through, you could pop the card back in that old motherboard and make sure the card wasn't damaged somehow (maybe a connector was damaged in the swapping...).

2. It has nothing to do with peripherals, OS, drivers, or anything. PCIe link speed is an interaction between the video card and the motherboard, using the motherboards BIOS, at boot-up. That makes the problem MUCH simpler (ok : one small possibility : other PCIe based peripherals messing the bus up. But I suspect you have none of those)

The long of the short of it : once you do the test I recommended to make absolutely sure it is not the video card, you can be certain it is THE MOTHERBOARD. NOTHING to do with software, and nothing to do with any other hardware components.

Now, with the motherboard, you can take the following steps :

1. Search EVERY bios menu. I know ASUS mobos have some settings for manually controlling PCIe bus clock speeds and other things. Never know what you might dig up.

2. Try OLDER firmware. You can flash to various versions of the BIOS for this motherboard to see if it helps.

3. Once you have done step 1 and 2 you now will know for certain the problem is hardware : your motherboard is bad (which I honestly suspect from the start). Have to RMA it or exchange it.
March 31, 2007 10:22:08 PM

That made things a bit easier...

1. Took me hours to get the new motherboard set in, no thanks. I can live with 8x if I had to do this :D 

2. I only have a PCI based sound card.

----------

1. Did that.

2. I'll try it! But I'm going to wait for ASUS to make a helpful suggestion.

3. Oh god the horror! It reminds me of RMAing my 8800 which took weeks!
!