Product description Manufacturer's Description The ASRock P67 Extreme6 is a high-end ATX P67-based motherboard similar to the ASRock P67 Extreme4. The main differences between the Extreme6 and Extreme4 are USB 3.0 and SATA3 ports/connectors--the Extreme6 boasts four rear USB 3.0 ports while the Extreme4 sports two and offers six total SATA3 connectors versus the Extreme4's four. ... https://www.electronics70off.co.uk/products/Asrock-P67-EXTREME6-REV-3.0-1155-Motherboard.html