It an okay card considering it is actually a HD 5770 which was released back in Sept/Oct 2009.
C2D E8600 2.8GHz
ASUS P5SD2 VM
Its a good card for your CPU but I would not trust that PSU with anything ass I cannot find any reviews or specs on it at all.
Generally speaking, even if the Odyssey is a below average PSU, based on the wattage it should be able to handle the HD 6770 due to it's relatively moderate power requirements.
I have the 6770 myself, downgraded from the 6870 cause I like the 1 6-pin connection and its lesser power consumption. 450W is the minimum recommended for the 6770 but some PSU doesn't provide the power they said on the label.