OK, I've just upgraded my ePMP3000's and Force300's to Version 4.4 (RC30) and I've done some throughput tests. What I've done is to have a MikroTik RB4011 connected to the AP's ethernet, and another RB4011 connected to the SM's ethernet - so that I can test the real throughput that the ePMP Link is capable of carrying, using the MikroTik's test. The RB4011's are running 6.44.3
So - first testing in 40Mhz channel widths with 75%/25% ratios, and testing in TCP, using the 'Both' (Bi-Directional at the same time) test. This test was 249 Megabit download and 54 Megabit upload - so an aggregate of 303 Megabit per second in a 40 Mhz channel.
I also tested in 80 Mhz channel widths - although it clearly says "Beta Quality" on the 80Mhz modes. For this test I wanted to the one-way 'upload only' and then the 'download only' and then to also do a 'both' Bidirectional test. In the following image, this is showing the AP's throughput graph - showing how much sustained traffic it was carrying, while the Mikrotik 4011's were doing their tests through this link.
This is 80 Mhz channel with 75%/25% ratios.
The Upload only test was 191 mbps (25% ratio)
The Download only test was 536 mbps (75% ratio)
The 'Both' Bi-directional test was 532 + 174 = 706 mbps aggregate
