This depends on the size of the effects and the sample rate. At 48kHz, you can run one of (for example) the following 8 channel presets on each of the two DSPs:
3 23 Octal Compressor
3 16 Compressor_8
3 31 8*10 Grafic Eq
3 12 8 Diatonicshifts
6 20 Combdelays 8ch
6 27 LongPanningDelays8
10 32 4 Stereo Verbs
These are just a few of many – you get the picture …
