802.11ac 5Ghz Connect at 40Mz Channel Width?

MacBook Pro (Retina, 15-inch, Late 2013
I have a 15" Late 2013 tMBP running Yosemite. My router is a Buffalo WZR-1750DHPD running dd-wrt from the factory. Build 23709c for those that are familiar with dd-wrt. The router is dual band and has the ability to set 20/40/80Mhz channel widths. No matter what I do, I can get my rMBP to connect at anything other than 20Mz. To see how I'm connecting I use the Option + wifi icon in the upper right. As you can see it say 20Mhz.
I have the router set for 40Mhz on the 5Ghz band. I'm stumped.

Hi!
Is your EA6500 running on the classic firmware? Or have you already upgraded it to the Smart Wifi?
You mentioned that the channel width is at 80 MHz. Was the channel on Auto? You may try other channels & find the best pair for the 80 MHz Channel Width.
Also, check the Asus PCE-AC 66 PCI card wireless properties, whether it's maximized or was just set to N-only. This can be checked by going to Control Panel > Device Manager > Network Adapters > right click on the aforementioned adapter then choose properties > Advanced Tab > check under Properties List & corresponding Value.

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Hi
My desktop pc has an Asus PCE-AC 66 PCI card (supports up to 1300 mbps wifi) and is only 5m or so away from the the EA6500 router without any obstructions - yet i cannot connect at 1300 mbps AC wifi. On the EA6500 router, i have selected 'mixed' as network mode under 5ghz (since i have some other devices which connect on wifi N on 5ghz) but if i select channel width as 80mhz, i have issues connecting to the 5ghz network on the desktop pc. The desktop briefly connects and under status it says lan speed as 1.3gbps but then it disconnects and i can't connect again. If i select channel width as 'auto' then no problems, the desktop can connect but lan speeds are only 400-600 mbps. Any idea why i cannot connect at 1300 mbps? I suspect i may connect at 1300 mbps if i choose network mode as 'AC' but then my other wifi N devices on 5ghz won't be able to connect.
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Hi!
Is your EA6500 running on the classic firmware? Or have you already upgraded it to the Smart Wifi?
You mentioned that the channel width is at 80 MHz. Was the channel on Auto? You may try other channels & find the best pair for the 80 MHz Channel Width.
Also, check the Asus PCE-AC 66 PCI card wireless properties, whether it's maximized or was just set to N-only. This can be checked by going to Control Panel > Device Manager > Network Adapters > right click on the aforementioned adapter then choose properties > Advanced Tab > check under Properties List & corresponding Value.

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Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

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