4 slots supporting DDR3 1066/1333 MHz (max 16GB or 32GB depending on specific BIOS/module compatibility). Expansion: 1x PCI Express x16 slot. 1x PCI Express x1 slot. 2x PCI slots. Storage & I/O:
(Pins are numbered top-left to bottom-right) Acer Inc Ipisb-vr Rev 1.01 Manual