The reason I asked G4 digital audio is for a MIX Core+3 MIX Farms, so 4 PCI slots needed.
AFAIK the 4th PCI slot on older G4 models is just for video, so unsure if compatible with a MIX Farm
I have a working QS but it is too loud for me, and I don't want to faff around with replacement fans if I can avoid it, so am after a less noisy older G4 which will take the 4 MIX cards
Sorry about the colour thing - I was going on the appearance of the front panel - dark blue (or graphite?) to distinguish from the QS/MDD models with a lighter hue on the front panel.
The "Blue and White" G3s have a touch of green about them to me but maybe my colour perception is off.