My old 8800GTX started doing red horizontal lines after some years. I baked it in the oven. It worked for another six months, then I upgraded. Now my GTX 580. Used for 4+ years. Then it started doing blue horizontal lines almost everywhere. I baked it in the oven. Working like day 1. Procedure: 1) Unmount every cooler\plastic parts. It means you will need T4 srewdriver for most screws. 2) You don't have to remove paper labels, they resist. 3) Remove all the thermal paste, you will replace it after cooking. 4) Take the naked GPU with GPU at top, under it put oven\cooking paper (not aluminium paper), cover plastic 6/8-pin PCI-E power sockets with a little piece of cooking paper for more safety (these are the only exposed plastic parts left), then put it in the oven at the middle with baking tray. 5) Oven setting: you have to pre-heat it to 180°Celsius/356°Fahrenheit, then you put the GPU at middle with baking tray (GPU at top). VERY IMPORTANT: It must be set to STATIC, not fan-assisted\"ventilato", this would definetely break the card, not grill too, just STATIC HEAT FROM TOP AND BOTTOM. 6) Leave the card for 8 minutes (8,5 is still OK, not much over 9 minutes). 7) Remove the tray and wait a bit until the card is touchable, then remove from tray and leave it over a table until it's fresh. 8) Put thermal paste everywhere, close it, put in your PC, voilà new card. Have fun. Do at your own risk anyway.