Since vSphere 6.5, Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE) has been supported. RoCE provides extremely low latency and high throughput communication over an Ethernet network, and allows one VM to access the memory contents of another VM directly, without the involvement of the hosts' CPU. This is usually reserved for network-intensive applications. Like FCoE, it requires a lossless network. RoCE requires hardware support in the form of Host Channel Adapters (HCAs) when VMs communicate across different ESXi hosts. RDMA is built into ESXi, and therefore, HCAs are not required when VMs reside on the same ESXi host. As of vSphere 6.7, only some Linux distributions support RoCE, such as guest operating systems running virtual hardware version 13 or later. The RoCE support in vSphere 6.5 (and later) is named Paravirtual RDMA (PVRDMA).