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sli possible

Mr.Reggin
By Mr.Reggin
in Graphics Cards
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CAn a Z97 mobo with two x16 Gen 3.0 slots run SLi, when the second one just runs at x4 speed (gtx 970)

The question at hand is what motherboard are you talking about?

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No it doesn't it can run on 4x 2.0 if he wants but anything under x16 2.0 or x8 3.0 will bottleneck his cards.

I thought it was more than just bottlenecking and that NVidia was doing something to stop those trying to run cards like that.

 

(shys away)

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No it doesn't it can run on 4x 2.0 if he wants but anything under x16 2.0 or x8 3.0 will bottleneck his cards.

Yes it does. SLI demands at least 8x electrically regardless of the PCIe generation.

 

Also PCIe 2.0 8x does not bottleneck at this point so that is also wrong.

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SLI requires at least an 8x slot on both cards to run.

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CAn a Z97 mobo with two x16 Gen 3.0 slots run SLi, when the second one just runs at x4 speed (gtx 970)

You will get them to run at 8x each. 

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You haven't even bothered to mention WHAT Z97 motherboard you are asking about...

 

Regardless, SLi REQUIRES the PCI-E slots to be at X8 speed electrically, otherwise, the drivers will not let you enable SLi.

 

Your motherboard will need to specifically support SLI for SLI to work. Just having two PCI-e slots or being able to use AMD CrossFire does not guarantee that your motherboard has SLI support. Consult your motherboard manual or manufacturer website for this information.

 

Note: Common motherboards that usually support SLI are the Intel P55, X58, P67, Z68, Z77 and X79 chipsets as well as the AMD 990FX chipset. LGA775 and other AMD motherboards also support SLI when equipped with an nvidia chipset or are specifically licensed.

Note: Any PCI-e slots you plan on using for SLI need to operate in 16x or 8x mode. 4x and 1x mode are not supported.

 

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I thought it was more than just bottlenecking and that NVidia was doing something to stop those trying to run cards like that.

 

(shys away)

Correct, ive just leant the hard way and found my second GTX970 wont run SLI where i want it to cos the slot was 4x. Not happy, my previous crossfire worked fine in 16x 4x but now i have to suffer because Nvidia said so.

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but it says x16 lane running x16 and x16 lane running x4

are you realy sure?

Here's what the link I posted says:

1 x PCI Express x16 slot, running at x16 (PCIEX16)

* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.

1 x PCI Express x16 slot, running at x8 (PCIEX8)

* The PCIEX8 slot shares bandwidth with the PCIEX16 slot. When the PCIEX8 slot is populated, the PCIEX16 slot will operate at up to x8 mode.

(All PCI Express x16 slots conform to PCI Express 3.0 standard.)

Where are you seeing 4x? It just says two x16, one runs at 16 one at 8, and 8 on both if running sli.

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  • Author

Here's what the link I posted says:

1 x PCI Express x16 slot, running at x16 (PCIEX16)

* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.

1 x PCI Express x16 slot, running at x8 (PCIEX8)

* The PCIEX8 slot shares bandwidth with the PCIEX16 slot. When the PCIEX8 slot is populated, the PCIEX16 slot will operate at up to x8 mode.

(All PCI Express x16 slots conform to PCI Express 3.0 standard.)

Where are you seeing 4x? It just says two x16, one runs at 16 one at 8, and 8 on both if running sli.

ah ok, btw, will the pcie lanes get slower when i use a wifi card on a PCI slot?
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