Mind you I am using Outboard Amplifiers for All Channels on my 3008, but I find it very hard to believe that the 809 has more power than either the 3008 or 5008 as both are THX Ultra2 Certified while both the 809 and the Integra are THX Select and both weigh almost 20 Pounds more. Also, the AVR Reviewed from that link is based off the 808 and not the 809.
There has been a great deal of debate about the All Channels Driven Test. Especially the methodology. All I know is it simply does not make sense that AVR's that have 4 separate Power Transformers would be less powerful.
The Integra based off the 807 also output over 100 Watts when tested by HT Magazine as well. Perhaps it could be that the 3000 and 5000 are 9 Channel AVR's, but it just does not make sense.