Hi all, I found my graphic card is stuck at 500 Mhz instead of 680 Mhz. After a lot of search and tests, I finally found that the graphic card's bios is in the motherboard's bios. I modded it with radeon bios editor, but I am unable to replace the module. I tried with Phoenix BIOS Editor, but it is unable to rebuild my bios, even the stock one. Next, I tried with Phoenix bios tool, but it always builds the original module. It is a Dell Studio 1555 laptop. I can upload some needed files tomorrow. Last of all, I'm sorry for my english, I'm french Thanks a lot. Finally found by myself : I forgot to check "Allow user modification of other modules" in advanced settings of phoenix tool...