Intrinsic said:
Whats here not to understnd?
Why is this complicated? Unless you are intentionally making it complicated?
Now there are tons of other factors that affect how any drive performs. But this factors are always fixed. This part is more complicated and what I've been avoiding getting into cause I was trying to keep this topic as simple as possible.
Simply put, you will get the best performance you can get from a drive interface combo on a PS4pro when using an Sata 3 based SSD in the PS4pro than you would any other solution available.
Now let's not even look at transfer speeds as we don't really know what system overheads contribute to the PS4/PS4pro performance. Because if a certian amount of transfer bandwith is tued up by the OS thst amount will be constant regardless of ehat drive you out in there. So let's just look at the tech employed instead.
If A HDD (5400/7200/SSHD) over a Sata 2 interface gives you (60/52/48secs) loading times respectively then using a Sata 3 drive (7200rpmHDD/SSD) will give you around (42/20-30secs) respectively.
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It is not complicated at all. The problem is that the maximum what can be achieved is close to meaningless 
What I was trying to say is that SSDs are fast because they are SSDs - not because of the interface they are connected to.
For example, take a random shot from the internet:
What you see here is that SSDs can saturate a SATA link only in certain cases but the bandwidth itself is not the reason they are fast. The benefit is that access times are way faster.
I have one computer which still has a SATA2 interface and a EVO 840 connected to it. The computer is amazingly fast from everything I want from it, in terms of IO Wait.
Yes, the wrong interface can limit the maximum throughput of a drive but that doesn't mean it runs circles around any mechanical drive out there. It actually does.
Also perhaps you might read this, too:
http://www.tomshardware.com/reviews/ssd-upgrade-sata-3gbps,3469-16.html
"Almost No Advantages for SATA 6 Gb/s On A Typical Desktop"
That doesn't mean this applies to the pro, too, though. It all depends on how the data is present on the disk, if there is any compression involved or if there are other limits to the system like the usb routing in the old PS4 but just looking at the interface speed where the drive is attached isn't even telling half of the story.
