so lets see here.. 2 reports of a fix after what? 9 months of complete failure? ..... absolutely shameful.

That new driver is not listed on the XP521 update page 

I can not download it from Dell driver update site. Anyone has a link with the driver that is working?

I would like to try it to see if there is any better.

I know I searched, when you click on compatibility on that driver page it shows:

Systems

Inspiron Desktop 2330

Operating Systems

Microsoft Windows 8 64-bit

I have an XPS 521 with Win 7 64 bit.

THERE IS A FIX FOR THE WIRELESS PROBLEM for N-6235: - NEW INTEL DRIVER.

today the dell tech downloaded and installed the new Intel driver.  this has FIXED the problem.  before the fix using wireless 3.5Mbps download speed. Using dongle 24Mbps.  Now without the dongle 24Mbps.

Using the Intel N-6235 card:

 Driver version: 15.5.7.52

Google brought me this:

www.dell.com/.../DriverDetails

@emy12 I can read compatibility with Win7.

What about all of the new systems with the Killer n 1202 ?

Yes, that is the right driver.  

Note that the Dell tech performed several configuration settings with the driver that I would not have known to perform.

Here's how my driver is currently configured:

802.11n Channel Width for band 2.4 - Auto

802.11n Channel Width for band 5.2 - Auto

802.11n Mode - Enabled

Ad Hoc Channel 802.11b/g - 11

Ad Hoc QoS Mode - WMM Disabled

Bluetooth AMP - Disabled

Fat Channel Intolerant - Disabled

Mixed Mode Protection - CTS-t0-self Enabled

Preferred Band - 3. Prefer 5.2GHz band

Roaming Aggressiveness - 3. medium

Transmit Power - 3. Medium

Wake on Magic Packet - Enabled

Wake on Pattern Match - Enabled

Wireless Mode - 5. 802.11a/b/g

I am unable to install the "new" driver. My system actually sees it as being older (approximately 2 months) than the one I currently have on my system.

Could anyone who has implemented this "fix" show speedtest results?

I'm unable to download the new drivers for all of the recent updates from Feb. When installing it says its the same version I already have from January. No idea.

15.5.7.52 driver version for the Intel N-5235

this appears to have been created on 11/19/2012. i don't know when it was released, however when the tech helped me he downloaded some stuff from January.  i'm not technical enough to have paid attention to that.  Hopefully, a Dell rep will weigh in at some point to this largely abandoned constituency.  This is kind of the blind leading the blind.  And that among customers willing to pay for Dell's premium product.  Makes you wonder.

Speedtest Comcast - alternating tests over 10 minutes

Built-in wireless: Download Mbps

http://stage.results.speedtest.comcast.net/result/215315992.png

9.45

http://stage.results.speedtest.comcast.net/result/215317162.png

18.82

http://stage.results.speedtest.comcast.net/result/215318062.png

12.14

http://stage.results.speedtest.comcast.net/result/215318362.png

8.82

Average 12.31

Dongle: Download Mbps

http://stage.results.speedtest.comcast.net/result/215316562.png

9.24

http://stage.results.speedtest.comcast.net/result/215316832.png

7.26

http://stage.results.speedtest.comcast.net/result/215317762.png

22.75

http://stage.results.speedtest.comcast.net/result/215319072.png

16.25

Average 13.88