A couple days ago a posted a couple questions about overclocking a GTX 550Ti. Now though I am having another problem. I raised the core clock to 1000 MHz and the voltages to 1.112. Using Furmark to stress test the overclock everything was fine. I got no artifacts and no thermal throttling or any other problem with a 20 minute test. However when I played a game it stayed at 1000 coreclock/2000 shader clock for a few minutes but the core clock drops to 405 and the shader clock drops to 800. Also the memory frequency which is set at stock also drops into the low hundreds. So what is wrong and what is going on? Is the overclock unstablen or do you think it's just the game?