Even when lower cost Broadcom-based dual-band AC3100/AC3150 class routers like ASUS' RT-AC88U and RT-AC3100 started shipping a few months later, working MU-MIMO firmware was still MIA.
And when we finally tested a Broadcom MU-MIMO router with allegedly working MU-MIMO firmware in the form of TP-Link's Archer C3150 in August 2016, we found MU-MIMO performance so poor, that it was essentially non-functional.
Routers like Linksys' EA8500 and NETGEAR's R7800 Nighthawk X4s actually had working MU-MIMO when they shipped.
But as we found in our test of six MU-MIMO enabled routers a little over a year ago, there was a big difference in total throughput gain, which is the whole point of MU-MIMO.
Here are two S7's connected to the R7800 with MU-MIMO off... Average total throughput drops from 624 Mbps to 513 Mbps, a loss of about 18%.
Other manufacturers like TP-Link have created a new model version like the Archer C3150 V2 and even created a new FCC ID.The other problem working against MU-MIMO as a useful Wi-Fi technology is that devices support it have been slow to come to market, particularly in the U. But if you're an i Phone fan, Apple has yet to support MU-MIMO, and perhaps never will, at least until they settle their kerfuffle with Qualcomm.Tablets supporting MU-MIMO also still aren't that common.This happens with both Qualcomm and Broadcom-based routers; the problem is on the client side.I was able to get my hands on a pair of Google Pixels and a pair of Samsung Galaxy S7s to test this.It turns out that Broadcom's problems were not all in firmware, however.I learned late last year that some manufacturers have quietly been phasing a BCM4366 C0 version of Broadcom's 4x4 radio So C into production without any visible model number or version change to products.Some of these still await firmware upgrades to enable MU-MIMO.AC2600 class routers with Qualcomm's 4x4 radio were next to market in mid-2015.It's interesting that TP-Link's Class II Change letter refers to the previous BCM4366 B1 as "SU-MIMO". phones to support MU-MIMO were Google Nexus and Samsung's Galaxy S6.The takeaway here is that even if you load new firmware onto your AC3100/3150/5300/5400 router, it's unlikely you'll get decent MU-MIMO performance. Both Google and Samsung continue to include MU-MIMO in their phones including 2x2 MU-MIMO in Google's Pixel and Samsung's Galaxy S7/S7 Edge.