I just got a 4670 from Moderno.

First card had some issues, due to artifacts appearing at clock speed when I use Furmark. Moderno changed 1-1, and now everything is fine.

2 lessons:
1) Buy for reputable seller like Moderno
2) Once you get a card, it's best you try some Ati-tool or furmark to check for errors (even if you don't plan to overclock) it's best you check for issues on the stock settings.

So far, everything looks good. Furmark for 1-hour also OK.