Hi as mentioned in the other thread, the radio in this device is clearly only a single chain one that is clearly running in "n" mode. Its quite common for tablets and smartphones to have only a single chain, most lower price range laptops are the same, only a single chain, hence they only can achieve 65MB/s on a 20MHz channel (72 if short guard band is invoked on the AP).
If you want to use 40MHz channels then you will need to allow this in the AP, your other laptops should then be able to achieve 300Mb/s (or there abouts) but I dont recommend you use 40MHz in the 2.4GHz band, but happily do in the 5GHz band if your AP is a dual band one. It appears this tablet is dual band so will get extra bandwidth if its enabled on your AP and the AP set to 40MHz in th 5GHz band.
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