Does anyone know if Yosemite DP 6 enables TRIM for 3rd party SSD's again? Or should I just wait to install my SSD? (I'm doing an upgrade from a traditional HD)
What I did was install the SSD while the machine was running mavericks, then install TRIM Enabler. Then from there turn off TRIM, and install Yosemite. Once Yosemite is all installed, then I re-enabled TRIM.
Yes, that used to be the case with the earlier Developer Previews. The application "TRIM Enabler" has since been updated and will not cause foot failure.