I'm sorry you have problems with your 5770's, but I do not. I love my 5770's.
That was last week, I didnt play many games throughout the week, and couple days ago I went to CCC and did the auto tune, (because I want to sell this POS), it started going crazy windows shutting down... So i rebooted and set it to factory defaults and disabled overdrive...started playing wow again and after 30mins game shutdown and windows went beserk, if I had of left it, it would have BSOD. I just hit the reset button to play with things.
Basically even though the cards @ stock, it seems to still act as it did when overclocked too far. Now I get 100% load on both, BSOD... and major overheating and I can't seem to fix it. (Apart from smashing them to pieces and asking for a refund.)