it seems i've keep the benchmark view of it... i think i've posted it somewhere here but dont know and dont care where it is, so here it is again...
1) 3D view ON, more than 50% means more than 1 CPU used.
2) turning OFF the 3D view back to normal view, ok near 0% CPU usage
3) 3D view and Spectrum/Spectrogram ON simultaneuosly... 65% usage
judge by yourself, so imho if 3D view is not your cup of tea, you only need normal view, then you will be fine without an upgrade. in fact, even if all views ON, you will still be fine, the scope will not BSoD..
ymmv.