 Users have reported using up to 8MB of volatile RAM successfully.Yamaha also offered a rack-mount version of the SY85 called the TG500.It lacks the keyboard, sequencer, floppy drive and continuous sliders but adds additional outputs, a further card slot of each kind (for four slots in total) and 2MB of waveform ROM for 50 additional internal waveforms for a total of 8MB over the 6MB of the SY85.