Apple Mac Pro (Mid 2010) - Manual (Page 32)

32 Chapter 2 Life with Your Mac Pro
Internal Expansion Options
Drive carriers (4)
Optical drive carrier
Slot 1: Double-wide
PCI Express graphics
(graphics card installed)
Memory slots
(4 or 8 slots depending
on model)
Slots 2–4: PCI Express
Battery
(behind graphics card)