DRAM access is always going to be variable by nature, though they reduce the problem somewhat by never reordering loads and stores. Stores will always write back to D$1 cache and only hit DRAM when a line needs to be flushed from the last level cache, so assuming your data and code fits in cache you can theoretically have 100% determinism (although all of the specific latency numbers are model-dependent, so just like a traditional DSP you'll have to tune for each target).

It's also worth noting that hard real-time systems tend to be custom designed, and often for high-budget products like medical devices or test equipment. So it is probably possible to add a bunch of SRAM to the board, and guaranteed latency to that memory is very easy.