First up, the networking. My highly unscientific benchmark consists of doing an online speed test and then transferring a 100MB file from the NAS (which has a gigabit connection to the router). I expect the online test to top out at maybe 16Mb/s, as the reported sync speed is only 17Mb/s, but who knows?
For reference, the full stats from the router are:
|Link Rate||17646 Kbps||1287 Kbps|
|Line Attenuation||15.5 dB||9.5 dB|
|Noise Margin||4.9 dB||6.9 dB|
And now for the testing!
With the onboard 802.11g adapter (theoretical max speed 54Mb/s):
FTP file transfer from the NAS: 17.65Mb/s
With the shiny new 802.11n adapter in 2.4GHz mode (theoretical max speed 144Mb/s):
FTP file transfer from the NAS: 47.93Mb/s
With the shiny new 802.11n adapter in 5GHz mode (theoretical max speed 300Mb/s):
FTP file transfer from the NAS: 75.80Mb/s
So the result is that the internet is only slightly faster (I'm probably limited there by the ADSL connection), but local traffic is much faster. There's one more thing to try - currently, I'm using two antennas plugged directly into the back of the wifi card, so essentially the entire computer case is between the antenna and the access point. But I also have an external antenna on a short cable that was being used by the onboard wifi...
FTP file transfer from the NAS: 43.51Mb/s
I did not expect that result. I can only speculate as to what the cause might be - perhaps the other antenna isn't optimised for the 5GHz band? Or possibly the multiple-stream stuff only works if the antennas are located close together. Weird.