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[darksorcerer]

Just picked up this adapter yesterday to replace a USB adapter I picked up a while ago (The LINKSYS WUSB6300 AC1200 WIRELESS-AC USB ADAPTER, plugged in via USB 3.0 port).  I wanted a PCI-E card initially but Bestbuy only had the USB one, so I went with that.  The USB one had been working fine regardless, but playing 1080p MKV videos between computers would freeze or pixelate periodically...

So yeah, I got the PCI-E DWA-582 adapter instead thinking it would handle this sort of application better... but...

The problem is...
- When testing the card, running a speedtest on speedtest.net and also on speedtest.shaw.ca (as Shaw in Canada is my internet service provider), the download speed is consistently better then the USB adapter by about 10mbps... which is great.  I get about 60mbps instead of about 50mbps...  BUT... the upload speedtest never completes and I get a timeout error every time...  The upload speedtest starts out fast at about 3.5mbps... then starts to slow down to less than 1mbps, then it times out.  When I Disable the new dwa-582 adapter and switch back to the Linksys USB adapter, the Linksys adapter completes the Download and Upload test consistently, but again the download speed is about 10bmps slower...  So I know the issue is not related to my 802.11ac network... channel settings, interference... etc.  Otherwise both adapters would be affected...

There seems to be only one driver available as well, so I can't try a different one...

However, I do think this is a driver issue...

My modem/router Combo:
Brand: CISCO
Model: DPC3848V

Set to AC only, 5ghz only... but I think these setting are irrelevant as the USB adapter on the same machine does not have this issue...

I'm running Windows 7 home premium 64-bit...

[FurryNutz]

What channel are you using on 5Ghz.
How far away is the DWA from the ISP modem/router.
Can you test the DWA on a different PC to see if the same thing happens?
Does wired LAN cable tests pass?

PC 3rd Party Security Software Configurations

• Turn off all anti virus and firewall programs on PC while testing. 3rd party firewalls are not generally needed when using routers as they are effective on blocking malicious inbound traffic.
• Turn off all devices accept for one wired LAN PC while testing.

[darksorcerer]

What channel are you using on 5Ghz.
How far away is the DWA from the ISP modem/router.
Can you test the DWA on a different PC to see if the same thing happens?
Does wired LAN cable tests pass?

Hey thanks for the reply

So the wifi channel is set to auto, so each time the modem/router combo is reset is scans automatically for the best available channel.  That being said, I'm not at home right now, but last time I looked I believe it was on channel 67...  and running a third-party wifi analyzer app, there were no other wifi connections in my frequency or channel range at all.  And also, my other AC USB adapter on the same machine works fine, and has a much weaker antenna as it's just a USB adapter...

The distance between the dwa-582 and the ISP modem/router combo is... The modem is in my living room, the the dwa-582 is installed in a computer in an upstairs bedroom right above the living room.  Not sure how many feet that is... but it's not very far anyway.

Technically I could test the dwa-582 in my livingroom computer which is running Windows 10, but I would like to avoid that if possible as that would really be a lot of work.

The only LAN cable test that can be performed is on my Windows 10 livingroom computer which is right next to the modem, and yeah that passes with flying colors every time...  And... But... even the Linksys USB AC adapter on the same computer passes with flying colors and doesn't get timeout errors... just the download speed is slightly slower...

[FurryNutz]

Try channel 36, 48, 149 or 161.

[darksorcerer]

Ok I'll have to try later this evening sometime when I'm home from work.

Just out of curiosity though... How or why would the channel cause an issue like this on the dwa-582 and not on the Linksys USB AC adapter on the same computer?  Just trying to understand why you think that might work?  I wouldn't say I'm an expert, but competent for sure... so really just trying to make sense of it...

Uploads don't time out on the Linksys, but
Uploads do time out on the dwa-582...
Just running speedtests...

[FurryNutz]

Might try to remove any other MFr wifi drivers to be sure. Remove the D-link ones then re-install.
Use the drivers from the web site.

Not sure what channels are supported on the Cisco modem however D-Link supports 36 thru 48 and 149 thru 165 on there routers and wifi APs. Could be this 67 is specific to Cisco. Testing of the adapter on a different PC would be recommended and also testing with a different wireless router would be good too. If the problem persists then it could be a faulty adapter.