This has been already been answered. Programs that report AGP 1x and/or 2x at the same time as 8x are in error - period. The early draft AGP 8x specs allowed AGP 3.0 transfer rates to fallback to 1x and 2x, but this was dropped completely in the final spec.
The PowerStrip *screen* report is correct, but the formatted diagnostic report gives the state of the secondary device on the 9x00 (4E641002h), not the primary (4E441002h).
PowerStrip 3.29 corrects that, reporting the state of 4E441002h: