Same. From what I have found is it acts as a cache between the CPU and the systems slower drives. It is best used in the business model world or perhaps in the workstation environment because for the most part the device stores your most frequently used applications and files.
For a while after launch you could only use it to speed up 1 drive, and I am pretty sure it had to be the drive you had the OS on to see any sort of advantage over a traditional SSD. I should mention that Optane is utilized best for caching the OS because the OS is comprised of a lot of small 4k files. Larger files you want a high sequential read/write.
So for gaming I am unsure. For the workplace environment these little modules really speed up the latency. It can do the same for you but you are unlikely to notice a huge leap and bound difference than running an SSD. Many gamers opt to just buy more SSD's as they need more space. The Evo's and MX500 for instance both range from 250GB-4TB of storage per SSD. 4TB models can go as high as $650.
That is where optane is intriguing. If you can get SSD speeds out of a traditional HDD. You can essentially buy a 12TB Drive (not the best one for gaming FYI; most in this category are server/security purposed or big databases 6TB WD Black 256MB/Cache is probably a safe bet for even a mid-high range gamer). Anyways from what I have seen in some of the youtube tests. They all run 16GB or 32GB modules to accelerate a HDD and the results do show that optane will act as a cache between the CPU and the long term storage. It is non-volatile so the memory in the Optane cache is not necessarily erased when the computer is powered down like RAM is. The results do show that when loading certain games, applications, and definetly if you are running an OS on a traditional HDD, optane is your best bet.
For comparison:
32GB Optane + 6TB WD Black 256MB Cache = $290 6TB 2.5" SSD (Samsung Evo 860) = $800+
So why would you not look to save perhaps as much as $400.
The question is whether Optane is going to help in your gaming experience. Afterall if I can put my entire gaming library on a cheaper traditional HDD and save my more expensive SSD for the important stuff like my OS, I would look at that as an option.
The question also becomes what kind of user are you:
This might be great for video editing fyi or maybe a server of some sort. I do not know honestly I think we are all still trying to figure out how to use it properly. Is this for enthusiasts or for workplace's? Can it position itself as both at the same time?
I think Optane only recently gained software updates that now allow for multiple drives to be supported. I believe in 2017 at least, optane could only accelerate the boot drive. It will accelerate an SSD but the performance of an SSD is already close to what Optane + HDD are doing, that it really is not an option if you already have a ton of SSD Storage Space Capacity that is idle.
If you have a ton of HDD's in a workplace setting. It is a cheap option to help lower the latency of the system overall. Freeing up valuable resources so the system which was once constricted now has this buffer that stores your most used applications, including the OS.