thanks for informing me,i didn't know this before,i found my gpu model which is sapphire nitro+ rx 580 4gb (sku# 11265-07-41G) and i saw that all 8gb version is 2000mhz and 4gb version is 1750mhz,mine is 1750mhz,now i have a question for you can i overclock it 1750 to 2000mhz?