z77 slot32GB. Expansion Slots. PCI Slots, 1 xPCI Express 3.0 *2.0 x16 slot (x16 mode) 1 xPCI Express 2.0 x16 slot (maximum x4 mode, compatible withOnboard mSATA slot for mSATA SSDs; PCI Express Gen 3.0 support; 2-way CrossFireX™ multi