In a larger city today, I visited with an owner of computer related business who has a commercial Cox account with 8 mbps down and 3 mbps up.
Testmy showed incorrect download result at 60 mbps on 25 Mbyte payload, but HTML5 Internet speed test, »speedof.me/
showed a score around 8 mbps down. Upload on speedof was way off, but Testmy was around 2 mbps this Saturday late morning.
Conclusion, Testmy download results for those with high speed bandwidth can be invalid on smaller payloads, but Speedof appears to be within expected results; whereas on uploads, Testmy is more accurate, but Speedof can be way off if one gets an incorrect result.
I have found SpeakEasy with similar results as Speedof on downloads.
Exede 5 mbps: WB-1: 163
About 2:35 PM CST
SpeakEasy: Seattle Server
Download Speed: 2424 kbps (303 KB/sec transfer rate)
Upload Speed: 668 kbps (83.5 KB/sec transfer rate)
SpeakEasy: LA Server
Download Speed: 6625 kbps (828.1 KB/sec transfer rate)
Upload Speed: 1231 kbps (153.9 KB/sec transfer rate)
Speedof: LA Server
Download Speed: 5.69 Mb/s
Testmy: Dallas Server Upload
:::.. Upload Test Results ..:::
Upload Connection:: 1017 Kbps or 1 Mbps
Upload Test Size:: 2.9 MB or 2992 kB or 3063420 bytes
Upload Speed:: 127 kB/s
Tested At:: »TestMy.net
Validation Link:: »testmy.net/db/FBQi4PD
Test Time:: 2012-06-23 14:37:58 Local Time