On what router? Have you read the wireless settings wikis?
R9000. I read all wireless setting wikis.
Single User Beamforming:
Controls whether 802.11ac beamforming is enabled for single user, aka "regular MIMO" connected devices that support beamforming.
Multi User Beamforming:
Controls whether 802.11ac beamforming is enabled for multi user, "MU-MIMO" connected devices that support beamforming. Since MU-MIMO is a 802.11ac wave 2 feature, all wave 2 devices will support beamforming & MU-MIMO.
Totally confusing. My believe was MIMO & beamforming is 2 different things. Is there even something called single user and multi user beamforming? Or is it a merged term that means beamforming with SU-MIMO & MU-MIMO thus eliminating a need for seperate MIMO setting?
That doesn't answer my question To clarify, I only enable Wireless-AC and all my devices support beamforming & MU-MIMO. R9000 is called Atheros based.
The question isn't primarily about MU-MIMO as well. I want to know about relation between 2 beamforming and 2 MIMO setting. You'll understand if you read main question again plus my reply to kernel-panic69.