Honestly, I personally wouldn't take one if they were giving it away for free. You may have different feelings, but it was discontinued after two months in production for a reason. Do your research before making this purchase in any event.
These are review quotes that tend to focus on the coil whine noise, but other issues commonly noted were a lack of frame pacing, Crossfire driver profiles, thermal throttling, and retail samples that underperformed their review counterparts:
"What is a major issue, though, is the extremely annoying coil whine the card emits as soon as it runs a 3D application... On the HD 7990, however, it is very apparent, and I don't understand how AMD missed such a glaring problem. I talked to five other...