Very slow 802.11n. 20" iMac, Vista, Broadcom, Belkin N1

Question

I've been trying to get some drivers working with Windows Vista. I'll post the results I've been having and maybe someone can assist.
I have a 20" brand new iMac with Leopard running bootcamp windows vista ultimate. When I connect to a Belkin Pre-N wireless router I get 802.11g wireless speeds(expected) of about 36mb/s (it's a good distance away, 2 bars).
I have another wireless router Belkin N1 wireless and I get differing wireless speeds/connectivity depending on what drivers I use. I have 5 full bars and an "excellent" connection rating for it.
I understand that the specifications for 802.11n that both belkin and apple use are based on draft specifications and may not be compatible.
The drivers on the leopard disk are marked as 4.80.75.0. I can connect using those and use the internet. But at very, very slow speeds (27.0 mb/s Broadband tests show .5% of normal speeds for my provider, a wired connection will get 105.8% of normal speeds for my provider.)
I got some other drivers that were posted by other users at the following location
(http://www.versiontracker.com/php/dlpage.php?id=115683&db=win&pid=149836&kind=&l nk=ftp%3A%2F%2Fftp.support.acer-euro.com%2Fnotebook%2Ftravelmate_2480%2Fvista%2F Drivers%2F802.11b%2BgBroadcom+Wireless+Lan+Driver4.102.15.61.zip)
Those drivers are marked as 4.102.15.61. It will connect 1 out of 7 tries at 270mb/s but will disconnect after a few seconds.
There are some other drivers posted by another user at the following location:
http://discussions.apple.com/thread.jspa?threadID=1309942&tstart=0
These are marked as 4.150.31.0. Same issue as the ones on the leopard disk. I get connectivity, but at very slow speeds.
I believe I have the most up to date firmware for my router but will check that and post on the message board some results. Another option that I have is to completely disable the 802.11n protocol on the router and just use 802.11g.
Does anyone know any other drivers out there that I could try? I will post findings. Again this is only a problem while trying to connect to a Belkin N1 wireless router. I get much better speeds/connection using a Belkin Pre-N router.

Answer 1

I have a 24" Core 2 Duo iMac (2.4 GHz, 4 GB RAM) running Leopard and an Apple Airport Extreme base station, and am having the same problem with slow wireless speed under Vista Ultimate edition with Boot Camp. All Vista software updates as of March 11, 2008 have been applied.
I've reinstalled the driver from the Leopard disk (no effect) and updated the driver directly in Windows, using the one that Windows detects automatically (no effect). Under OS X, I get close to optimal bandwidth over the 802.11n connection to my cable modem. The Airport Extreme is set to use 5 GHz only and does not use the 802.11g-compatibility mode.
When I use a wired connection to my gigabit Ethernet switch, everything is fine.
Message was edited by: jeffkirk