The longer I have this FM1 board running, the more enthusiastic I get!
After some teething problems, as how to enable AMD Dual Graphics (not explained in the ASUS manual, but for this board a-must-know),
I installed the latest BIOS and now thing are running quite well.

The HD 6690D2, formed by the A6-3500 combined with a HD 6670 (a DDR3 model for power consumption sake), really outperfoms my HD 4770 on those projects both cards can work on (Moo! and Collatz) at roughly half the power needed (44 Watt against 80 Watt, the power needed for the APU not counted, as I also do not count the power needed for the CPU that fuels the HD 4770)

The bottlenecks for the system for real big credits, BOINC-wise, are
1. The number of cores (could be 1 higher with the sheer unobtainable A6-3600, A8-3800 or the mythical A8-3820) and
2. The speed of the Graphics Core of the A6-3500, only 444 Mhz where the top models offer 600 Mhz. The overclockable Black Edition/K models might reach even higher, but are 100 Watt as opposed to the 65 Watt of the A6-3500, A6-3600, A8-3800 or the mythical A8-3820. Mind you, when running the A6-3500 at 2400 Mhz (Turbo mode) as I do you will reach 88 Watt anyway.

As some people say a second HD 6670 would cause the grapics of the APU to be disabled, I am now tempted to install a low power nVidia card in the second PCIe slot to see how that goes. Keep you posted.