So I recently RMA'd a Sapphire HD 7970 Vapor-X after it failed within the first month of use. I didn't do much overclocking with it because it had a very low OC ceiling to the point where it wasn't even worth it. I'm waiting on my replacement from Althon Micro to arrive, but I've recently learned that these GPU manufacturers almost never send out brand new cards as replacements and always sent out refurbs. Kind of disappointing news to me but I'm wondering about how refurbished cards overclock. Are refurbs generally terrible OC'ers? I get the feeling most refurbs are simply from people who return the card to a retailer like newegg within the 30 day period simply because they get a lousy OC. Anyone here have any experience with overclocking refurbished cards?