Dell XPS 8700 (Mid 2013) - Manual (Page 5)

Expansion Bus
PCI Express x1:
Connectors two
Connector size 36‑pin
PCI Express x4:
Connectors one
Connector size 64‑pin
PCI Express x16:
Connectors one
Connector size 164‑pin
PCI Express mini‑card
Connectors two
Connector size 52‑pin
Power
Input voltage 100‑240 VAC
Input frequency 50 Hz/60 Hz
Rated input current 8.0 A/4.0 A