Since you haven't provided any exact system information or details about what settings you actualyyl use, nobody can say anything.
New to this forum.
Here is my system details:
MS Windows 8 DG 7 Professional 64-Bit OS
(Gigabyte GeForce [GTX 780 Ti] GV-N78TD53GD-B)
Intel® C602 Chipset
Intel Xeon E5-1620 3.6 10M 1600 4C CPU
16GB Memory DDR3-1600 ECC
2TB HP 1000GB SATA 7200 HardDisc
(Noob description I know, don't know whats more important )
Im using the latest PS version, I bought the updated package from Adobe Creative Cloud.
I change the settings of my scratch disc location to be on a free drive (400 GB free) and the memory usage is on about 70%.