Using 256GB of ram, as I mentioned in another post, the simplest thing is to set tmpfs for 256GB and then use tmpfs for the both temp 1 and temp 2. This is only viable on linux though. I have some swap space that is on an SSD just for emergency overflow, but the swap is likely barely used. Basically if you have a low end SSD for the OS drive, using 16GB of it for swap should be enough to give a safety margin and that will probably be barely used or not used at all. Probably setting swappiness to zero is also a good idea:
sudo sysctl -w vm.swappiness=0