RTX NVLINK/SLI PCI express gen 4

[Arugas]

so I just picked up a second RTX 2080 (non TI), with two things in mind. if the games I play scale well and I get better performance than a 2080TI 30-50% of the time its money well spent as its cheaper. (factoring in used hardware). Also I don't game in 4k resolution only 1440p ultrawide so i don't need the extra GPU memory. With Ryzen 2 coming out I will be upgrading to X570 and the 12 core monster. As I am not familiar with PCI bandwidth restrictions I am looking for info on it. With two 2080's, 2080TI's, or RTX Titans, could any of these saturate PCI express Gen3 to its full limits? If so do you think Nvida could release a driver update to support gen 4? (I don't know if this is even possible) I have always loved running multi GPU setups and miss the days or 3-way and 4-way SLI. I personally know its not the most cost efficient way to collect more power. and can scale negatively. However, coming up on smaller and smaller architectures coming out for CPU's and GPU's I feel multi GPU setups will be the next "mainstream" enthusiast builds. As Navi and RTX will come closer and closer in performance over the next 3 years. Is any of this even a relevant thought? Please let me know what you think.    

[Jurrunio]

22 minutes ago, Arugas said:

could any of these saturate PCI express Gen3 to its full limits?

with 2-way DX12 multi GPU (doesnt need SLI bridge or NVlink), Titan V can hit bottleneck with PCIe 3.0 x8 per card. Otherwise, not really.

 

23 minutes ago, Arugas said:

(I don't know if this is even possible) 

if it is they would have done it already

[Arugas]

14 minutes ago, Jurrunio said:

with 2-way DX12 multi GPU (doesnt need SLI bridge or NVlink), Titan V can hit bottleneck with PCIe 3.0 x8 per card. Otherwise, not really.

 

if it is they would have done it already

OK as we sit, how far way from a gen 3 bottleneck would you say we are for an enthusiast? would it be better to wait for prices to drop on gen 4 or in the next 6 months stretching to a year do you think these limitations could be overwhelmed? 

[Jurrunio]

8 minutes ago, Arugas said:

OK as we sit, how far way from a gen 3 bottleneck would you say we are for an enthusiast? would it be better to wait for prices to drop on gen 4 or in the next 6 months stretching to a year do you think these limitations could be overwhelmed? 

No idea, don't know when will Nvidia or AMD's next flagship will come. If you're looking to keep the board for multiple years then you should aim high for the board in the first place.