The 877 Mbps sounds like it was definitely using MIMO on 5 GHz. Unfortunately the only answer I can offer is a range. Though there’s so many variables when it comes to wireless transmission and integrity that changes on a per second basis that it’s impossible to nail a hard number without controlled environments. The iPad is capable of the 1 Gbps maximum throughput according to spec. Though this is only on the 5 GHz spectrum and using a multi-station setup at 256-QAM Modulation with 8x/8x MIMO streams. The IEEE 802.11AC specification has wiggle room all the way up to 1 Gbps (~1024 Mbps give or take a few baud here and there). From what I can tell it looks like that model had Dual-Channel AC capable radios with MIMO.
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