I you want your hardware to last long time then don't buy sapphire. I already got one faulty graphics card even out of the box. People are complaining that fans in sapphire cards die after even a month. 2 months seems to be maximum expected life for sapphire cards. 
That is so odd you mentioned that! Literally a month ago I got barely used sapphire 5870 (I knew the originaly purchaser personally) and that damn thing died within 3 days of me using it for mining at stock speeds.. It took them 3 weeks to RMA it! I wish I could get the idiots to reimburse the btc I lost over that period of time.