Hello, I have MSI 5700 XT reference design video card. My card runs at very high GPU clock speeds when the system is idle. I was having the same problem at memory clock speed. However, I solved this problem with the CRU program. When the memory clock is idle, it runs at 200 mhz. However, the GPU clock operates at very high 770mhz speeds. This causes the system to heat up in vain. I couldn't find a solution on the Internet. Many users have this problem but there is no solution. NVIDA improves by choosing the optimum power option for the cards. However, there is no such setting in AMD software.