Annisman,
Nvidia suggests using 24 GB of system memory, someone probably already posted this but I wanted 2 make sure is all.
[QUOTE"GeForce GTX Titan X is itself a 12 GB card. So minimum amount of RAM required to support this card is 24 GB. If you have lesser amount of RAM, the card will still run but the entire GPU memory will not get utilized.It will get limited to 4 GB or lesser amount.We received some users who had less than 24 GB of RAM installed and the PC was showing up VRAM only as 4 GB. The OS will limit the VRAM if the system RAM is less than 24 GB. So as a result, it will be of no use having a 12 GB card installed in the machine. The system RAM will not be able to support 12 GB VRAM. And it will yield only 4 GB VRAM as available dedicated graphics memory. Since you are going to get such a powerful card with 12 GB VRAM, it will be of no use running it on 8 GB ( however, 8GB is really a good amount for other NVIDIA cards). So best is to get the RAM upgraded and enjoy the performance of the card."]