I doubled my RAM this morning from 12 to 24, so I decided to do another round of testing. The comp was very heavy: DNX sequences being read from the network, lots of keying, Particular, Optical Flares, and Twixtor. The recommendations for 24 seem to be bang-on: Quarter-res, Quicktime DNxHD 12gb RAM, fastest render: 9:30 24gb RAM, 3gb background, 2gb / instance, 7 cores used: 5:02 24gb RAM, 8gb background, 3gb / instance, 5 cores used: 2:15 Full-res, Quicktime Lossless 24gb RAM, 3gb background, 2gb / instance, 7 cores used: 17:10 24gb RAM, 8gb background, 3gb / instance, 5 cores used: 12:34 I'm impressed. I really didn't expect the settings change to make such a difference, especially since I didn't have much luck with the recommended settings for 12gb.
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