See below for specific requirements, sourced from the NVIDIA GEFORCE Surround Configuration Tool
GeForce GTX 1070 Single-GPU With 2D Surround (Landscape)
Orientation: Landscape
Accessory Display: Yes, no additional GPU (if using 3 or less displays)
Maximum Resolution: 11520x2160
Maximum Resolution (Bezel Correction): 10240x1600
Maximum number of displays: 2-4 in Surround,1 Accessory Display when using 3 or less displays in Surround
Special Instructions:
Any connectors can be used to enable Surround.
Once Surround is enabled, users can use any
connector for the Accessory Display.
Max of 4 displays can be used simultaneously (3 if monitors are 4K)
G-SYNC and regular monitors can be mixed in Surround; effects of G-SYNC will only be seen on G-SYNC- enabled monitors
GeForce GTX 1070 Single-GPU With 3D Surround (Landscape)
Orientation: Landscape
Accessory Display: Yes, no additional GPU (if using 3 or less displays)
Maximum Resolution: 11520x2160
Maximum Resolution (Bezel Correction): 10240x1600
Maximum number of displays: 2-4 in Surround,1 Accessory Display when using 3 or less displays in Surround
Special Instructions:
Once Surround is enabled, users can use any
connector for the Accessory Display.
Max of 4 displays can be used simultaneously (3 if monitors are 4K)
3D Vision Surround requires using three DVI or three DisplayPort connectors
All monitors must be the same make and model for 3D Vision Surround
Using DisplayPort connectors may require the use of DisplayPort to Dual-link DVI adapters. Please consult your monitor's manual for supported 3D connectors