Hello MikroTik Community. I'm new to Mtik and RouterOS and so far I love the products. I have been a diehard Ub*t user for years but I'm quickly starting to see the benefits of having total control over all the parameters I was never able to have. I decided to bench the new AR9888 AC radios and for the life of me I cannot get throughput above 162Mbps TCP and I was hoping some one could shine some light on the subject. Please note this is a lab environment, perfect conditions 0 noise.

Setup
Server - Windows 7, Quad xeon 1Gb nic
Client - Dell Latitude laptop win 7 1Gb nic
Switch - Netforce10 48port Gigabit switch
AP's - NetMetal5 with AR9888 (5180/80Mhz/AC Only), Ub*t AC PRO, Tp-Link Archer C7 v2 with DD-WRT

Tests
Using iPerf3 hardwired from server-switch-client I can achieve 782Mbps average.
Server Hardwired-switch-Netmetal5(WispAP)-Archer C7(Client)-Client I only get 162Mbps max throughput (link established 1,300Mbps Tx/RX)
Server Hardwired-switch-Ub*t AC PRO-Archer C7(Client)-Client I only get 155Mbps max throughput (link established 976Mbps Tx/RX)
Server Hardwired-switch-Ub*t AC PRO-NetMetal5(CAP)-Client I only get 159Mbps max throughput (link established 1,300Mbps Tx/RX)

Any idea why im getting such low results I should at least see close to 782Mbps right?? Thank you for all of your insight.

Try with 2 chains on netmetal and after that 40mhz.

Try with 2 chains on netmetal and after that 40mhz.

Thank you for your suggestion. Interesting find.
80Mhz Tx/Rx Chain 2 off - 146Mbps
40Mhz Tx/Rx All chains on(I know it does not matter) - 72Mbps
40Mhz Tx/Rx Chain 2 off - 71Mbps
40Mhz Tx/Rx Chain 1,2 off - 70Mbps

Very strange behavior, could this be self interference? Tx/Rx CCQ is 100% SNR 46 NF -105 so perfect conditions...