The DSP chips on the MIX card do not all have access to the same amount of RAM.3 chips have SRAM (Static Random Access Memory). Extremely fast but limited in size. Good for reverbs and short delays.2 chips have DRAM (Dynamic Random Access Memory). Slow but large in size. Good for long delay effects.1 chip has no external RAM. The new DSP's on the MIX cards have many times more internal memory than a 56002, so there is enough to do many processes including EQ, dynamics, and mixing.The original DSP Farms all had SRAM. This was wasteful when it came to doing long delays like Procrastinator (1 per DSP limited by RAM) and EQ's (which didn't use very much SRAM). We did an analysis of usage of RAM and determined that we could best use available board real estate and power by giving different flavors of DSP. This allows more instances per chip, as well as longer delays. The tradeoff is that you can run out of "compatible" chips while there are still DSPs available.