simulate with GPU but not maximum

[tiang_listrx]

im using realflow 2015 and using 2 GTX 1080 but when i check on "open hardware monitor" it only show each of my GTX 1080 GPU memory used 2300MB.
why my GPU memory usage not at maximum?

[ChristianZ]

Have a look at the GPU chapter in the online manual
http://support.nextlimit.com/display/rf2016docs/GPU

Only the Dyverso-Solver is completely optimized for use with GPU, but no talking about dual-GPU so it is probably not properly using them.