Taking advantage of PCIE 3.0

MrN1ce9uy · May 28, 2016

What would a build consist of to take advantage of PCIE 3.0 right now?

Gam3r01 · May 28, 2016

You dont really "take advantage" of it.
All PCIe protocols are backwards compatible, and there is no substation performance differences between them with current hardware.

MrN1ce9uy · May 28, 2016

Gam3r01 :

PCI Express 3.0 has up to 8GT/s bus speeds. I would need a motherboard that has a PCIE 3.0 x16 slot and a CPU that supports 8GT/s bus speed to [insert your word of preference here] reach speeds past the 5GT/s limit of PCIE 2.0.. am I right? Am I missing something here?

Gam3r01 · May 28, 2016

If you have a motherboard and PCIe device (typically GPUs) then yes you can use the full bandwidth.
However, there arent many, if any, devices that saturate the bandwidth on 2.0 in the first place.

MrN1ce9uy · May 28, 2016

Would high-res gameplay recording not benefit from the higher bandwidth? During gameplay recording, the data is transferred between the GPU and the CPU via the motherboard bus, and everything involved needs to be able to support 8GT/s bandwidth speed, right?

So.. I believe a Skylake CPU would be needed to get past the 5GT/s bus speed limit of previous gen intel CPUs.

Gam3r01 · May 28, 2016

You dont need that, as I said graphics cards cant even saturate the 2.0 bandwidth. So you could have a, for example, 3GT/s card on a 5GT lane or a 8GT lane. It wouldnt matter.

MrN1ce9uy · May 28, 2016

Ah, I see. So when a GPU claims it is PCIE 3.0 it is completely irrelevant? Do the upcoming generation GPUs not have enough processing power+speed to saturate the 2.0, or 3.0 bandwidth?

Now that I think about it, I do remember using Afterburner and only seeing ~20% utilization of GPU bus bandwidth with my 750 Ti.

Gam3r01 · May 28, 2016

I cant speak for Pascal or Polaris, but at this moment in time cards cant take advantage of the full bandwidth. (Hence why x8 x8 SLI works).
I wouldnt call it irrelevant, but its not required.

MrN1ce9uy · May 28, 2016

Thanks for clearing this up for me.

MrN1ce9uy · May 28, 2016

Sorry, but I would like to leave this thread unsolved. I want to know if PASCAL can "saturate" a 5GT/s lane enough that an 8GT/s lane would be beneficial. Actually, I could create another thread in Graphics Cards for that. I forgot I was in the Motherboard forum.

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Taking advantage of PCIE 3.0

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