[gambiting]

Funnily enough, I'm a PS4 developer, have two devkits on my desk, and I had no idea about any of those things(they are certainly not mentioned in official documentation). It's just not relevant at all to software development how the hard drive is connected or what sort of south bridge it uses.

[lsaferite]

Shouldn't the performance profile of something like the HDD be of some interest to a developer?

[gambiting]

It is. And Sony provides us with minimum and maximum available hdd bandwidth. We have to make sure that the game works and is playable at both(the devkits have a special mode to simulate the minimum available bandwidth).