Hi everyone, im a new member and this is my first post so if this has already been posted then please feel free to delete. I did a search and did not see what im about to post so here it goes. I have discovered that I can use a tool called Overclocker in conjuction with ATI TOOL and this cures the AVI, MPG downclocking problem in all of the drivers above 6.3! Its really simple, I use Overclocker to overclock my X1900XT with both Core and Mem. I use ATI TOOL to adjust the voltages. Make sure you apply your overclock with the Overclocker program and use ATI TOOL for adjusting the voltages. This works really great and you guys might want to give it a shot. Make sure you dont accidentaly change the clocks with ATI TOOL or it will downclock you again once video plays! You still have to have the two ATI services disabled and make sure that you use the 2D mode in the Overclocker program when you overclock! http://www.driverheaven.net/zardon/overclocker.zip I have my aircooled X1900XT running at 730mhz core and 832mhz memory.