- Nov 27, 2007
Yeah it's just that any kind of RAM is prohibitively expensive when going over 16GB, thus they opted to optimise the crap out of I/O (I really suggest you look at the PS5 presentation about the SSD they use, and how it differs from just using an m.2 drive on current PCs, it's very informative) to use as RAM extension.My all surprise with both the consoles is the low ram amount.
I was expecting more than 16GB:
- OS are more memory hungry- 4K requires 2x more ram capacity- RT requires more ram- Special sound require more ram- Games should grow in complexity so more ram for themIt seams the market requires some new type of intermediate RAM, one with more capacity than GDDR6/GDDR5/DDR4, slower and cheaper.
Probably something very similar to NVME but with less capacity and cheaper without the need of flash capability.
On PCs a 10x faster SSD usually means ~2x better loading times. Both of the new consoles have several fixed-function blocks that cut out a lot of the filesystem/OS/CPU overhead.
On PS5 they aimed to get 100x faster loading time (compared to a HDD) with a 100x faster SSD. Their target was 5.5 GB/s (which they sometimes beat significantly, with compression). This means you can keep a lot less stuff in the video memory and stream it in on-the-fly at quite impressive speeds (hundreds of milliseconds).
Xbox for instance has 100GB of SSD space set aside for the purpose. The "Sampler feedback" feature of DX 12 Ultimate means you can even keep parts of the textures off of GPU Memory (Microsoft estimated often only ~50% of large textures are actually sampled at a time).