6970 crossfire on z77

[Mergano]

Was just wondering what speed of PCI-e I would be getting with this config, as pci-e 2.0 and 3.0 is confusing me.

Am i looking at it being only x8 x8 2.0 unless i get 7 series GPUs, whereby then it would be x8 x8 3.0?

 

[Durvelle27]

whats the board model

 

[Mergano]

Asus P8Z77-V

 

[Durvelle27]

you want really notice the difference between 3.0 and 2.0 ?

 

[Mergano]

I am just curious as to which mode is enabled under what types of cards. For example, i know x8 x8 3.0 is supported, but is this only for the latest generations of cards, not the 69xx?

 

[Durvelle27]

it will work the same it just an 3.0 card will have a higher bandwidth

 

[guskline]

The 6970 has the following bus specs: PCI Express 2.1 x16 bus interface.

By your question I assume that you already have 2 6970s. They'll be fast.

 

[Termie]

Was just wondering what speed of PCI-e I would be getting with this config, as pci-e 2.0 and 3.0 is confusing me.

Am i looking at it being only x8 x8 2.0 unless i get 7 series GPUs, whereby then it would be x8 x8 3.0?

Yes.

You would need both a Gen3 card (HD7000/GTX600), plus an Ivy Bridge CPU.

You won't be any more bottlenecked than you would have been on a previous generation board, which is to say a couple of percent. Yes, PCIe 2.1 x8 is probably slow enough to slightly bottleneck a 6970.

 

[GotNoRice]

For PCIe 3.0, you need:

PCIe 3.0 CPU (Ivy Bridge)
PCIe 3.0 Motherboard (Z77, or X79 and Z68 motherboards in certain situations)
PCIe 3.0 Video Card (AMD 7xxx series or Nvidia 6xx (kepler) or later)

Not having any one of those 3 items will cause everything to fall back to PCIe 2.x.

But PCIe 2.x should be plenty of bandwidth for 6970 crossfire.

 

[Mergano]

Thanks for the answers.

I will be running at a res of 6020x1200, so was concerned that at this res there may still be issues with b/w not commonly discussed.