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Frag1

Z97 pcie lanes layout ?

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Posted · Original PosterOP

I have Z97 board, MSI Z97 G55 SLI specifically. Can you tell me which pcie lanes get disabled in the first slot when running x8 x8 sli ?

A diagram like this one for my board would be very helpful. Is it always the 'back' part of the slot ? Thanks.

index.php?action=dlattach;topic=251355.0

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Look at your motherboard manual. It will tell you what gets disabled in what configuration you run in. If you don't have the manual, go download it from MSI's website. 


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Posted · Original PosterOP

Man so not helpful. Its naive to think they put that in the manual.

I still think its gonna be the back pins, makes sense.

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The manual should be the first place to look for this information. It is up to the mobo manufacturer how they allocate the lanes.


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Posted · Original PosterOP

Maybe it wasnt clear. The lanes are alocated 16/0/0 8/8/0 8/4/4 thats not what im asking.

im asking what lanes (pins) in the socket are disabled ?

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40 minutes ago, Frag1 said:

Maybe it wasnt clear. The lanes are alocated 16/0/0 8/8/0 8/4/4 thats not what im asking.

im asking what lanes (pins) in the socket are disabled ?

It's always the ones on the right side that get disabled. The slot works like a physically shorter slot would.

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Posted · Original PosterOP

Thank you. 

 

Also where can i see in windows if the gpu is running at x16 or x8 ?

(i have a few broken pins on the right side)

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58 minutes ago, Frag1 said:

Maybe it wasnt clear. The lanes are alocated 16/0/0 8/8/0 8/4/4 thats not what im asking.

im asking what lanes (pins) in the socket are disabled ?

Wikipedia has a pinout of the PCIe slot: https://en.wikipedia.org/wiki/PCI_Express#Pinout

 

If a PCIe slot that is capable of up to 16 lanes is configured with fewer, the extra lanes are simply disabled. In the case of a 16 lane slot configured as 4 lanes, everything from pin 33A/B and on is disabled.

 

Also note that in a lot of consumer boards with multiple x16 slots, they may not actually be wired up for 16 lanes. A lot of times the second slot is only up to 8 lanes and the third is up to 4.

 

1 minute ago, Frag1 said:

Thank you. 

 

Also where can i see in windows if the gpu is running at x16 or x8 ?

(i have a few broken pins on the right side)

Use GPU-Z: https://www.techpowerup.com/gpuz/

 

EDIT: You should have the GPU running something while checking. GPUs tend to reduce PCIe usage if it's not doing anything as a power saving measure.

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Posted · Original PosterOP

Thanks guys i kinda suspected its gonna be the right pins since short cards plug in left ones. I just wanted to confirm it.

 

Turns out the first slot (single card) only runs at x8 due to broken pins, though x8 x8 sli still works for what thats worth.

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