pcie slots running slower than should be?

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MisfitJoker

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Jul 6, 2013
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I have an Asrock X79 champion 2011 lga and just put in my 2nd 780 ti gpu. I look at GPUZ and it says one is running at PCIE 2.0 x 16 @x8 1.1 and the other is running at PCIE 2.0 x 16 @x16 2.0. tried the stress test on my main monitor and nothing changed. my monitor set up is two 1920x1080, and a 3840x2160 as my primary.

what does that mean its running at? is it whatever is after the "@" symbol that they are running at? it should be all pcie 3.0 slots on the board in the first place and isnt 1.1 the original version of PCIE when it came out so its running super slow right?

i think i also read you can change/allocate pcie lanes in the bios or something, if someone could elaborate on that it would be of great help.
 
Solution
Gee Bee
you need to use slots 1 and 5, adding a third will will be 16/8/8
5 x PCI Express 3.0 x16 slots (PCIE1/PCIE5: x16/16 mode; PCIE1/PCIE3/PCIE5: x16/8/8 mode; PCIE1/PCIE4/PCIE7: x16/8/8 mode; PCIE1/PCIE3/PCIE5/PCIE7: x16/8/8/8 mode)

and no it won't bottle-neck, but scaling will reduce drastically with third, better with 2 x 16
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Gee Bee

Gee Bee

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Jan 16, 2014
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you need to use slots 1 and 5, adding a third will will be 16/8/8
5 x PCI Express 3.0 x16 slots (PCIE1/PCIE5: x16/16 mode; PCIE1/PCIE3/PCIE5: x16/8/8 mode; PCIE1/PCIE4/PCIE7: x16/8/8 mode; PCIE1/PCIE3/PCIE5/PCIE7: x16/8/8/8 mode)

and no it won't bottle-neck, but scaling will reduce drastically with third, better with 2 x 16
 
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MisfitJoker

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I cant really get my card that well into the first top slot cause of this plastic piece welded to the motherboard. i can try it if i have to but im nervous it will get stuck again and i wont be able to press the tab to release it.
 
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spooky2th

spooky2th

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May 18, 2010
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This is your PCIe slots specs:
5 (PCIE1/PCIE5: x16/16 mode; PCIE1/PCIE3/PCIE5: x16/8/8 mode; PCIE1/PCIE4/PCIE7: x16/8/8 mode; PCIE1/PCIE3/PCIE5/PCIE7: x16/8/8/8 mode)

Install the the two GPUs in PCIe1 and PCIe5 to get optimal speeds. Don't know what slots you are using now?
 
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Gee Bee

Gee Bee

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Well you don't have to, but it is not only recommended, it is worth doing so.

I doubt there will be any difference in real world gaming/application if your unable to do so.

 
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Gee Bee

Gee Bee

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Not according to Asrock. At sshould be 2 x 16 @3.0, at worse 16/8 3.0 and 2.0 respectively.
As good as GPUZ is, it not have all bases covered, i would try other S/W to either confirm or substantiate otherwise, including sisandra.
 
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Gee Bee

Gee Bee

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The PCI Express controller in Sandy Bridge-E has one more distinguishing feature: it supports 8 gigatransfers per second rate, i.e. meets the PCI Express 3.0 specification requirements. However the current Intel processors haven’t been certified yet that is why in most cases PCI Express 3.0 compatibility is not officially stated.

http://www.xbitlabs.com/articles/cpu/display/core-i7-3960x-3930k_4.html
 
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Gee Bee

Gee Bee

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No..

Ipso facto, i would not be too concerned whether your in 1 & 5 or even if your @ 16x or 8x, as well as being @ 3.0 or lower. The Asrock recommendations are clear however, the fact that you can't be substantiated at a desired level of performance because of specified CPU requirements takes nothing away from what your H/W is capable of. If you want everything to be as it should be on paper, then get an ivy-e. I hope that is not to blunt, it is not my intention.
 
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