By now using PPI should be the same as using GB for the RAM or GHz for the CPU (pre several cores, now it's a little bit more complex). 300 PPI is classified as

By now using PPI should be the same as using GB for the RAM or GHz for the CPU (pre several cores, now it's a little bit more complex). 300 PPI is classified as not retina but you wouldn't notice it anyway, that's why we need to drop the retina classification.