Intel BLKDZ75ML45K. Supported memory types: Dual DDR3-1600/1333/1066, Maximum internal memory: 32 GB. USB 2.0 ports quantity: 4.6 14, USB 3.0 ports quantity: 2.2. Audio output channels: 6,2. PCI Express slots version: PCIe 3.0 x16. RAID levels: 0, 1, 5, 10