Hi guys. System fx6300 motherboard gigabyte 970 d3s3p psu 750watt +80. I have 2 sapphire rx 480 8gb graphics cards. One is model 11260-01-20g and the other model is 11260-07-20g. I do not get an error even when I overclock a high amount of 01-20g model. Even when I overclock the other on my other card, I get an error. Sometimes I get an error when I do not overclock. I've tried every possible way. I changed the bios, changed the board, changed the psu, gave the voltage but my problem did not improve. I'm glad you helped me.