Agreed, x8 GPU and x8/x8 multi-GPU is plenty for even the most demanding of today's real-world games. There are actually instances where x16 GPU and x16/x8 (presumably also x16/x16) multi-GPU proves better, extreme instances where fps metrics are largely synthetic, but I think being able to reach these thresholds today is a sign of where things are going in hardware and software demands of the future.
I don't really agree that storage speed is a "compromise" anymore. I don't think it has been (with high-end hardware) since about early 2015. The performance advantages of fast storage are largely wasted in real-world (consumer) applications, and the sort of fast storage array you describe would be very difficult indeed to saturate without running tons of simultaneous hard-data hard-crunching virtual machines. Especially if you install the usual enthusiast allotment of 32GB~128GB (or more) physical RAM, doubly so if you allocate a good chunk of this RAM towards dedicated storage caching. I think the real performance bottleneck on this sort of "no compromise" system will actually be your processor (and also the chipset, to a lesser degree), even though they're basically the best stuff available at this time. Certainly better and faster hardware is always going to be better and faster hardware, I'm not saying that you wouldn't enjoy performance advantages, I am saying that I suspect there's various diminishing returns which will make these advantages much less spectacular than expected.
I'm flat out skeptical about the Optane 905p. Previous Optane products have been terribly overpriced and terribly underwhelming, much inferior to their M.2/NVMe (4xPCIe3) SSD counterparts, very disappointing. And there's very few online tests/comparisons/reviews available at this time for this new Optane, not enough "unbiased" data (yet) for me to decide what's fact and what's hype. I might be wrong (I kinda hope I am), but I seriously expect Optane 905p will be as disappointing (especially to tech-savvy gamers) as every previous Optane.
That being said, there are some niche applications where Optane proves to be superior to any alternative. Specialized high-hardware niches with heavy real-time data workloads, production video editing on Adobe Premiere (with workstation GPUs and JTAG2000 GPU Accelerators) is one such niche, massively complex and detailed (and animated) Autodesk and SolidWorks projects (with all the CPU cores and GPU cards you can pack) are another - and these run on platforms which don't just stuff an Optane onboard but carefully place Optane caching alongside other system drives. Admittedly, Intel's 3D XPoint (aka Micron QuantX) memory has seen numerous incremental improvements/refinements since first Optane launch in 2015, so maybe it's finally reached a tipping point where it can become more viable than other NVRAM technologies in a wider range of application models. It's just too early to tell, in my (skeptical and hopefully wrong) opinion.
And, back to my first point, most real-world performance of today's storage systems already exceeds most real-world demands on today's storage systems, there's little real difference between the top-tier products other than their prices and their synthetic benchmark scores. Even the most stalwart enthusiast has to question his sanity when the deciding parameter is a balance between massively inflated costs and slightly inflated benchmark scores.
Still, I'm also a computing enthusiast and I always love seeing other computing enthusiasts push the boundaries. Regardless of your results (which are hopefully impressive), your benchmarks could provide valuable data in influencing my own hardware selections.
You might want to check out
Seagate Nytro XP7200 and
HighPoint Intros SSD7101 - although both will be a little hard to obtain through consumer channels for a while. I still use a few good olde
Comay Enterprise BladeDrives because they're 8xPCIe2 cards so they're easy to plug into "empty slots" on almost any platform with fully populated PCIe3 lanes.
"All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams
[/Korth]