Have you tried updating the frimware on your router? Anohter thing to try is to go http://www.dslreports.com/tools and run the Tweak Test. After running the test, follow the advice to optimize the rwin settings for the wireless adapter.
I just got my second Vostro 1500 but this one has the 1505 card. What a dog! Using both laptops side by side, the one without was 4,664 kbps down and 1,600 kbps up. The 1505 was 1,200 kbps and 918 kbps respectively.
These tests repeated several times showed very little difference.
So my questions are -
Can I remove the 1505 card easily?
Will the integrated NIC then work?
Is it easier to send the whole thing back and start over?
Exact same issue with Vista 32bit on a Dell Studio Hybrid. This should be addressed with drivers/firmware, clearly this card has issues. I can reproduce it on D-Link and NetGear routers and an older Broadcom chipset in the XPS One works great. The 1505 is a Broadcom chip as well so this should not be too tough.
I also echo the troubles others have reported with this card. My computer is a new Dell and sits six feet from an "N+" class Belkin wireless router which has two antenae. The Dell reports a solid "excellent" connection yet the speed varies from its best ever 130Mb/sec to a low of 11Mb/sec. I had Dell Support remote in and install the latest drivers for this card and even tweak the settings on the router. At best, I get 130Mb/sec - better than the G router I had before but not as high as hoped and certainly not reliably steady.
I'm running this card on an XPS M1330 with a netgear wgt624 router and have been having the same problem. I don't really consider this a solution but I had a thumb drive connected to one of the USB ports, I noticed the night before the card was working fine and I didn't have it plugged in, low and behold I pulled it out and it worked fine. I believe the real solution is to not get this card in the first place if you can avoid it (apparently if you call in you can get the intel wireless-n card even if they don't allow it online). I've thought about trying to upgrade my router to wireless-n, I wonder if this has made a difference for anyone.
I have a wirelss -n router and the same wireless card on my laptop (Inspiron 1525). It started behaving erratically, sometimes it would connect sometimes it wouldn't. I have another laptop at home that connects to the same router without any problem. Because we actually got hit by lightning I troubleshot the issue with Dell thinking it may have been a hardware problem. One visit from a service technician, new cover and new wireless card later, the problem was still there. Conecting whenever it pleased. Dell offer to tackle the problem for a fee, which I refused as I find this shouldn't be the policy when under warranty. What fixed my problem was removing the dell wireless utility that comes pre-installed, removing the wireless card fromm the hardware list, and letting it pick-up the default broadcom drivers pre-installed in the computer. Hope this might help some of you.