So apparently the first mac pros had the freezing issues with D300, D500 and D700.
Then Apple said that there were faulty graphic cards and accepted to replace D500 and D700 only, ignoring the fact that D300 were having the same issues.
As a result of this, the new mac pros with the updated D500 and D700 are working fine now and Apple removed from the market the machines with D300.
Is this correct?
So what should users with D300 mac pros do in order to have a freezes-free machine?
I was clearly told at the Apple Store that they cannot do crossgrades (Eg. replacing a D300 with a D500/700, even if I told them that I was going to pay for the upgrade. They said this is impossible to do). So bax2003 how did you manage to make this magic happen?
Regarding my situation (6cores, 64 GB ram, D300) I decided not to go back to Mavericks and I'm still on Sierra, experiencing around 2 crashes a week and saving my projects like crazy just to avoid the disaster.