I have two laptops – one 8-month old Asus 1215n win7/32 containing an Atheros wireless driver, and one new Asus 1225b Win7/64 laptop containing a Broadcom wireless driver service. The new laptop is the new version of the old laptop, with twice the memory and a faster hard disk. My wireless router is a Dlink DIR-655 Extreme N, updated with the latest firmware 1.34. I have installed inSSIDer, and can see that the router is using two channels 11+7. I have also tested data throughput speeds using LANSpeedTest.

The problem is that the old laptop connects at 150Mbps with the data throughput about 77 Mbps, and the new laptop connects at 72 Mbps with data throughput about 44 Mbps. This does not seem right to me – the new laptop should be at least as good as the old laptop. I have excellent signal strength on both laptops – which are only a few feet apart – and have been careful to check all wireless parameters that I can think of on both machines, including using AES encryption.

I'm at the point where I'm looking at dual band, dual channel external USB wireless Adapters so that I can jump right to 300 Mbps connections, with hopefully something like 140 Mbps data throughput. However, I do not know if that is possible with my current D-Link router.

Can anyone suggest how I can get 150 Mpbs out of the new laptop (maybe I'm missing a setting?), or where I should go to from here? Thanks in advance.