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PCI speed x8 after put to sleep

Last response: in Graphics & Displays
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January 26, 2011 1:34:38 PM

I am running a Asus P6x58d MB with two 5870 in Xcrossfire (10.7 Driver). I am having a problem with the Bus Interface speed on my first PCI slot going to x8 after I put my computer to sleep over night. The second PCI slot seems to always be at x16. If I restart the computer it returns to x16 and stays there till I put the computer to sleep again. I am using GPU-Z and CPU-Z and they are both showing x8.

Yesterday I changed my Power Option Plan to High performance and under the Link State Management I made sure it was set to off. I don't believe my MB has any power saver features. The only thing i can find has to do with PCI slots 2 and 3 are the Link Width speed (auto, x8 x8, x16 x1).

It was doing this before I added the second 5870 so that did not cause the problem. Any ideas?

thanks,

More about : pci speed put sleep

a b U Graphics card
January 26, 2011 1:50:26 PM

You may have to go into the BIOS and force those slots to run at x16 x16 mode.
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January 26, 2011 2:19:08 PM

I don't believe I can do anything directly with the #1 slot, just 2 and 3. Unless If i select x16 x1, for the #2 and #3 slots, wouldn't that force #1 slot to x16?
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a b U Graphics card
January 26, 2011 2:25:18 PM

Judging by the fact that slot 1 has no direct control settings, it's default is always x16. It may be an idea to put your cards in slots 1 and 2 (if you haven't already) and to force slot two to x16 mode.

By the way, the real world performance difference between x16 and x8 is about 4% so you're hardly going to see a huge difference in games.
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January 26, 2011 3:23:14 PM

Yeah they are in 1 and 2 and forcing #2 to x16 was what I was thinking.

No there isn't much of a difference between x8 and x16, i'd just like to know why it's doing it. Things like that drive me nuts.
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a b U Graphics card
January 26, 2011 5:08:13 PM

Yeah it would get to me as well, but it's good to know that it's not massively affecting your system should it be an incurable thing.
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