It looks right to me, since on a 12 GB system, at most 9 GB can be used by PR. The rest is reserved for other applications. And 8 is still less than 9. It just means that PR is using all available resources the best it can.
It also explains why a system with only 6 GB can be way slower than a 12 GB machine on encoding, because of the better memory usage.
Yes, well Colin,
We have 12 Gb ram with similar results on a Xeon Quad Core computer, getting rid of some 1,448 temporary files from rendering in another program left there by accident ,helped by typing %temp% in Windows address box and deleting the lot, I could then write a DVD ???????????
My Canon HV 20 gets a lot of VTR work too, from a Canon 5D mark II H264 mov as we need to get edited video to a Sony Bravia 46" for viewing.