PCIe Lanes question

[Ellargo333]

Hi!

I have a MSI Mpower MAX AC z97 motherboard, with an I5 4690K.

Currently I have an MSI GTX 970 installed on a PCIe x16 slot

 

I am thinking of buying an "M2 to PCI-E X4" adapter so I could buy  Samsung 950 pro and use all of it's power, because the m2 is internally conected to sata ports, so it will have lower speeds.

 

My question is... Will my GTX performance be affected? It will be PCIe x8 if I install the adapter.

 

PD: I saw linus video about it, but I am asking just in case someone find some issues about doing this.

         I am thinking of buying the new GTX 1080... is it going to need al the x16 lanes?

 

Thank you all!

[shadowbyte]

probably not

x8 is more than fine

[Drunk_Klaus]

Linus has a good video showing the performance of 16x 8x and 4x. there was barely any difference iirc

[vanished]

Even if it ran at 8x you probably won't notice any difference, but in all likelihood it will actually still be at 16x since those 4 lanes will come off the motherboard's chipset

[Ellargo333]

6 minutes ago, Ryan_Vickers said:

Even if it ran at 8x you probably won't notice any difference, but in all likelihood it will actually still be at 16x since those 4 lanes will come off the motherboard's chipset

Hi!.. thanks for your answer... I didn't understand why it will be still 16x...

 

[vanished]

1 minute ago, Ellargo333 said:

Hi!.. thanks for your answer... I didn't understand why it will be still 16x...

 

Basically there are "primary" PCIe lanes that go directly to the CPU, and a "secondary" set that is handled separately and doesn't count toward the CPU's total.  Typically you want to just plug graphics cards into the main ones and let the secondary handle everything else.  You could plug the SSD into the primary lanes but then your GPU would drop down to 8x, at the benefit of having the SSD go directly to the CPU.  I don't know if you'd notice any storage speed benefit doing that though.

[Ellargo333]

3 minutes ago, Ryan_Vickers said:

Basically there are "primary" PCIe lanes that go directly to the CPU, and a "secondary" set that is handled separately and doesn't count toward the CPU's total.  Typically you want to just plug graphics cards into the main ones and let the secondary handle everything else.  You could plug the SSD into the primary lanes but then your GPU would drop down to 8x, at the benefit of having the SSD go directly to the CPU.  I don't know if you'd notice any storage speed benefit doing that though.

Nice.. now I do understand.. I will leave my GPU on the main PCI... I prefer optimal GPU rather than SSD... Thank you so much!