The performance of your PC depends on its software.

The only obligatory requirement for the hardware is the possibility of connecting at least six monitors. You can do it by using one video card with four outputs (if your motherboard has 2-3 outputs and your CPU has integrated video) or two-three video cards with two video outputs (For motherboards with at least three PCIx16b slots). It is recommended that you use the power supply board with sufficient capacity (which should 1,5 times exceed the total capacity of your hardware). A separate video card should be used for the working station with several monitors.

An approximate PC configuration for 6 working stations:

• Processor Intel Core i5 7500 3.40GHz Intel® HD Graphics 630 graphics which supports the connection of 3 monitors (performance is at the level of GeForce GT 730/740)
• Motherboard MSI B250M Pro-VDH with one PCI-Ex16 and three DVI / VGA / HDMI video outputs — in the BIOS settings you need to enable the use of integrated video along with discrete.
• Video card GIGABYTE GeForce GT 730 1066MHz PCI-E 2.0 1024MB 5000MHz 64 bit which allows connecting three monitors
• RAM – at least 16GB and the possibility of increasing the amount of memory, if necessary.
• As a system disk for systems with a large number of workstations – it is recommended to use an SSD drive instead of HDD
• Power supply board – at least 800 W

This is an approximate configuration for assembling the desktop tower with the possibility of connecting six monitors.