Sobre el tema de usar ssd m.2 hay que tener en cuenta varias consideraciones segun Cerny, antes de que muchos caigamos en errores.
Having said that expandability of our SSD is going to be quite important, flash is costly and you may very well want to add storage to whatever we put in the console, now the kind of storage you need depends on how you're going to use, it if you have an extensive PlayStation 4 library and you'd like to take advantage of backwards compatibility to play those games on PlayStation 5, then a large external hard drive is ideal, you can leave your games on the hard drive and play them directly from there thus saving the pricier SSD storage for your PlayStation 5 titles, or you can copy your active PlayStation 4 titles to the SSD.
If your purpose in adding more storage is to play playstation 5 titles, though ideally you would add to your SSD storage we will be supporting certain M.2 SSDs, these are internal drives that you can get on the open market and install in a bay in the playstation 5, as for which ones we support and when I'll get to that in a moment, they connect through the custom IO unit just like our SSD, does so they can take full advantage of the decompression io coprocessors and all the other features I was talking about.
Here's the catch though that commercial drive has to be at least as fast as ours games that rely on the speed of our SSD need to work flawlessly with nem to drive, when I gave the Wired interview last year I said that the PlayStation 5 SSD was faster than anything available on PC, at the time commercial M.2 drives used PCIe 3.0 and four lanes of that cap out at 3.5 gigabytes a second, in other words no PCIe 3.0 Drive can hit the required spec.
M.2 drives with PCIe 4.0 or now out in the market we're getting our in samples and seeing four or five gigabytes a second, from them by year's end I expect there will be drives that saturate 4.0 and support seven gigabytes a second.
Having said that we are comparing apples and oranges though because that commercial M.2 Drive will have its own architecture its own flash controller and so, on for example the nvme specification lays out a priority scheme for requests that the M.2 drives can use, and that scheme is pretty nice but it only has two true priority levels, our drive supports six we can hook up a drive with only two priority levels definitely but our custom IO unit has to arbitrate the extra priorities rather than the M.2 drives flash controller, and so the M.2 drive needs a little extra speed to take care of issues arising from the different approach that Commercial Drive.
Commercial Drive also needs to physically fit inside of the bay we created in PlayStation 5 for m2 drives, unlike internal hard drives there's unfortunately no standard for the height of an M.2 Drive, and some M.2 drives have giant heat sinks in fact some of them even have their own fans.
Right now we're getting em to drive samples and benchmarking them in various ways, when games hit in beta as they get ready for the PlayStation 5 launch at year-end we'll also be doing some compatibility testing to make sure that the architecture of particular M.2 drives isn't too foreign for the games to handle, once we've done that compatibility testing we should be able to start letting you know which drives will physically fit, and which drive samples have benchmark appropriately high in our testing, it would be great if that happened by launch but it's likely to be a bit past it, so please hold off on getting that M.2 drive until you hear from us, ok.
- Los M.2 pcie 3.0 obviamente no sirven.
- Actualmente no existen ningún ssd M.2 a la venta comercialmente pueda replicar el formato de ssd interno de la consola.
- No vale cualquier M.2 Pcie 4.0 ni siquiera los mas rápidos actualmente que suelen rondar los 5GB/s (raw), el mismo dice que no mezclemos naranjas con manzanas, ya que aunque usen un formato m.2 el controlador que usa el interno de la consola es muy diferente con respecto a los controladores usados en las unidades comerciales, como ejemplo indica que la controladora personalizada que usan en el ssd de ps5 tiene 6 niveles de prioridad y las unidades comerciales solo 2 niveles.
- La consola puede hacer funcionar M.2 Pcie 4.0 con controladoras de dos niveles de prioridad, pero estos necesitan ser mucho mas rápidos para no tener problemas derivados con esta diferencia con respecto al interno, esperan que los fabricantes de cara a fin de año pongan a la venta unidades de 7GB/s (raw) que permitan solventar este problema.
- Por otra parte, no existe una normativa estandarizada para la altura de los ssd m.2 y algunos modelos tampoco podrían servir, por usar disipadores, ventiladores, stacks de memoria mas altos y tal.
- Están comprobando las unidades que saldran que puedan ser compatibles y recomiendan que se espere a que ellos verifiquen y certifiquen que unidades son compatibles con la consola para tener un rendimiento adecuado.
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