the 5400rpm stock drive isn't that much slower than the upgrades. Although disappointing in some respects, it's actually good news in others - why spend the extra money on a hybrid drive, when a 2TB 5400rpm unit isn't that much more expensive? It seems that just like PS3 upgrades, cost per gig is the biggest consideration in choosing a new HDD.
we saw little to no in-game improvement when we compared game performance from the standard stock drive to an SSD. Trials Fusion texture pop-in apart, loading time improvements are the only real benefit we can see right now.
Something worthy of serious thought is a 2TB 5400rpm drive: typically, the higher the storage, the more data is crammed onto the platters, so while 5400rpm may not sound particularly fast, bandwidth does increase according to data density. If we were to start this feature from scratch, we would probably swap in one of these drives in favour of the hybrid SSHD
the variable success we got from the onboard caching suggests that the price premium isn't really worth it. On the flipside, while 2TB 2.5-inch 5400rpm drives are expensive, USB 3.0 "passport" variants are actually cheaper, and only a little pricier than the hybrid drive. There's another bonus too: prise the drive out from the enclosure and not only do you have a PS4 upgrade, you also have a caddy in which to house your old 500GB HDD.
