да, вы можете поменять GeForce GTX 760 на AMD Radeon RX 580 GTX XXX Edition
... из спецификации AMD:
Requirements: External Power 1x 8-pins Minimum Power Supply Requirement 500 watt XFX Recommended Power Supply XFX 550W PSU Card Dimension (cm) 27 x 12.4 x 4 Card Dimension (inch) 10.63 x 4.88 x 1.57
... от спецификаций NVIDIA:
Requirements: Supplementary Power Connectors Two 6-pin Minimum Recommended System Power 500 watt Height 4.376 inches (11.11 cm) Length 9.5 inches (24.13 cm) Width Dual-slot
PCI-E = PCI Express