PCIe 3.0 vs 4.0 implications on video card performance?

[Intervenator]

So I've been reading up on PCIe 4.0, and expectations for it are speeds of 32GB/s. The question is, are video cards getting capped by the current PCIe 3.0 interface, therefore making an upgrade to PCIe 4.0 a no brainer? I am trying to decide whether to upgrade now (from Z-77, 3770K to X-99, Broadwell-E) or next year, when PCIe 4.0 is expected to come out. I really can't decide if I will *need* PCIe 4.0 in 2-3 years when I upgrade to the next generation video cards (or the generation after that). Thought?

 

[imaheadcase]

Nope, i can't remember link, but performance for single cards was less than 1% difference between it. As for pascal or future cards? i don't think anyone knows till it happens. Unless we get a huge leap in bandwidth with a certain generation should not be a issue.

 

[frowertr]

https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/

Article is a couple years old but is still valid. GPUs can't even saturate a x16 slot currently on PCI-e 2.0.

 

[Intervenator]

So bandwidth will improve, but the impact on performance will be negligible. I assume this upgrade will really only be beneficial for storage upgrades then?

 

[TemjinGold]

Do you multi-gpu? It CAN help if you are using like 3-4 gpus at once. If you are like most people and use just 1-2 gpus, you won't feel it.

 

[nenforcer]

I have a friend who has a Core i5 3570 on a Z77 board and he is going to wait until next year Intel Cannonlake for this very reason - to hopefully get a DDR4 / PCI-E 4 motherboard with possibly more than 4 cores chip for Intel mainstream system.

 

[RussianSensation]

I am trying to decide whether to upgrade now (from Z-77, 3770K to X-99, Broadwell-E) or next year, when PCIe 4.0 is expected to come out. I really can't decide if I will *need* PCIe 4.0 in 2-3 years when I upgrade to the next generation video cards (or the generation after that). Thought?

Get a better monitor and/or a new GPU if you got $.

https://www.techpowerup.com/reviews/AMD/R9_Fury_X_PCI-Express_Scaling/18.html

If you overclock your CPU to 4.4-4.5Ghz, I'd skip a CPU platform upgrade until Icelake in 2018/Icelake-E in 2019.

 

[myocardia]

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