BUC 101 provides excellent expansion possibilities. Seven PCI slots accommodate a wealth of expansion cards. DIY-friendly features include SATA HDD/SSD EZ-SWAP dock, a large CPU cooler cutout hole and almost completely tool-free design. Getting the system up and running with BUC 101 is a great joy. To keep inside equipment clean and cool, PSU and fan filters are provided along with the magnetic air filter for side panel.