Hi Daniel...there is no RAM preview in DaVinci Resolve. Everything happens in the GPU in real time and the slower the GPU you have, the lesser real time capability you'll get. You can do a render (cache) to disk to get real time playback.
If you have a disk array that can play back DPX files in realtime (and it's being used for the cache), you can switch to "user selected clips" render cache mode. Then when you right click a clip and mark the clip for render cache, Resolve will write out DPX files the first time through the clip. Then until you make a change it will play back in realtime.
You could also enable "all clips" render cache mode and you won't have to select each one.
If only the cache would be a permanent solution.
But it gets invalidated as soon as you leave the project.
So its quite unusable for long term projects where you wanna pre-render a full act or movie to be safe for presentation.
I also have the problem that very often the cached images only give me a black screen.
I need to invalidate the cache to get it back.
Same problem I had in Resolve 8
Right now there is a bug in R9b3 where the CACHE directory gets lost when adding a new timeline of sometimes just changing timelines.
I think I pasted it in 30 times now ;)
Also one should be able to shift select a group for processing to disk, but only single clips allow that feature.
An IO selection would be great too.
Thanks for the replies. It would be nice to see a RAM preview type option in a future version. I guess a similar effect could be achieved by caching to a fast SSD. I recall being in grading sessions using Base Light where the colourist had to use something like a ram preview as the nodes stacked up or maybe he was caching to disk.
[Daniel Christie]"I guess a similar effect could be achieved by caching to a fast SSD."
Black Magic has some notes on the use of SSDs in their configuration guide relating to "burst rate" versus "sustained" data throughput. May work for very small files, but it doesn't seem like a general solution.
"I always pass on free advice -- its never of any use to me" Oscar Wilde.