There is a mounting arms race in gigabit Wi-Fi, and particularly the dash to implement the latest rounds of the 802.11ac standard. Most vendors now support the base level of the standard and are now adding second-round features such as multiuser-MIMO. These extensions are only in draft as yet, but pre-standard chips are already appearing, with a David and Goliath contest brewing at the cutting edge, between Quantenna and Broadcom. Qualcomm Atheros recently added multiuser MIMO to its VIVE Wi-Fi chipsets, but did not include support for another feature of stage-two 11ac, six-stream MIMO. Broadcom this week announced the industry’s first six-stream platform for home routers, labelling it ‘5G WiFi XStream’ and promising peak data rates of 3.2Gbps ‘ 50%…