Because it's a pretty generic term, so I guess in circles were precision is desired, DRAM is preferable. You could claim to "store everything in RAM" and still

Because it's a pretty generic term, so I guess in circles were precision is desired, DRAM is preferable. You could claim to "store everything in RAM" and still be talking about a conventional disk, for example. It's probably worth making the distinction here, considering they're claiming "maximum performance", implying fastest possible hardware available, which isn't the case: they'd at least be using SRAM if it were.