I'am mining on Windows 7 with 1x HD7990 (GPU 1 +2), 2x R9 290x (GPU 3+4) 1x R9 390 (GPU 5). As seen in the picture the GPU usage with all cards but the HD 7990 fluctuates between 0% and 100% every few seconds - no difference in solo- and poolmining. No special settings, I just used a straight forword windows tutorial and installed the newest Catalyst drivers (yes - noob
). I had to underclock the HD 7990 and the two 290x cards for heating reasons, the 390x is a little bit overclocked - temperatures are all around 80 - 85 C°.
Is this fluctuating GPU usage normal? Thanks for your help .