Where they differ from the Oculus Rift recommended specifications is in RAM and the amount of USB ports required. Oculus quotes 8GB of RAM is ideal, while it needs three USB 3.0 ports and one USB 2.0 port for operation. READ: HTC Vive preview: An experience that’s out of this world. One thing in Oculus' favour though is that it only requires a HDMI 1.3 port rather than HDMI 1.4.