PCI-SIG: PCIe 4.0 in 2017, PCIe 5.0 in 2019

[cdawall]

The SSDs on those cards act as VRAM, they interface directly with the GPU, not the PCI bus.

They act as a buffer between vram and system memory, but also transfer back to during rendering?

 

[Slavko]

If the difference in performance are like difference between pcie 2.0 and pcie 3.0, then there is no point in the new standard.

http://www.hardwaresecrets.com/pci-express-3-0-vs-2-0-gaming-performance-gain/4/

 

[R0H1T]

If the difference in performance are like difference between pcie 2.0 and pcie 3.0, then there is no point in the new standard.

http://www.hardwaresecrets.com/pci-express-3-0-vs-2-0-gaming-performance-gain/4/

Very little to do with actual standard, rather the hardware that can make use of it. As was mentioned earlier, 100G ethernet, Optane, 4x Titan X(x) & so many other devices will probably need something like 16x PCIe 5.0 in the future.
Gaming gains are minimal but there are already many other devices that have the potential to saturate the current PCIe 3.0 bus on regular desktops.

 

[eidairaman1]

Very little to do with actual standard, rather the hardware that can make use of it. As was mentioned earlier, 100G ethernet, Optane, 4x Titan X(x) & so many other devices will probably need something like 16x PCIe 5.0 in the future.
Gaming gains are minimal but there are already many other devices that have the potential to saturate the current PCIe 3.0 bus on regular desktops.

Exactly what though???

 

[R0H1T]

Exactly what though???

Optane for instance, it's artificially limited to 8x bandwidth because there aren't (m)any desktop boards that can make use of such high speed storage, they'll run out of PCIe lanes (from CPU) & DMI 3.0 will also be a bottleneck.
Intel Introduces "Ruler" Server SSD Form-Factor: SFF-TA-1002 Connector, PCIe Gen 5 Ready

 

[JES]

2.0 8x takes a hit of 4%, 2.0 4x takes a hit of 16%... etc...I'd clarify and say 2.0 16x is still ok.

It depends a lot on the game. The last figures I saw from benchmark articles were from years back, so they are not valid any longer with today's GPU power. On my old PCI-E 2.0 rig I noticed a big bottleneck in many games when I had plugged my GTX 1050 Ti to an x8 slot mistakenly. Also there are certain games that are bottlenecked by 2.0 x16 as well, one of them is rFactor 2 (discussed here).

 

[EarthDog]

I quoted those values from here who used a gtx 1080. Yes, it varies by game...i used the overall average as listed in the results.