You’re thinking of using an 8GB graphics card designed for general computing and playing games to drive four 3840 x 2160 monitors which are to display “an Ultrahigh-Resolution 3D Human Brain Model”?
[i]Standard Memory Config 8 GB GDDR5X
Maximum Digital Resolution *2 7680x4320@60Hz
*2 - 7680x4320 at 60 Hz RGB 8-bit with dual DisplayPort connectors or 7680x4320 at 60 Hz YUV420 8-bit with one DisplayPort 1.3 connector.[/i]