I have Wesena ITX7 case with Intel i3 21xx CPU. Whatever settings I choose for the fans my case fan does not turn faster than 950 rpm. As load increases CPU fan starts going faster and faster making lot of noise, I think if case fan started rotating little faster CPU fan wont have to go so fast and it will make for quieter operation. This was not a big issue since most of the time cpu fan stayed lower than 1300 rpm. But after I added 3.5 inch second HDD (originally I had only SSD in there) situation has worsened significantly. There is not a lot of clearance between CPU heatsink and lower side of the HDD, also additional wires have made everything little crowded making airflow further restricted. This case has sliding bracket for the HDD which makes arranging wires properly very hard. Now CPU fan rotates at more than 1500 rpm most of the time and even going above 2000 rpm its really noisy, but still case fan stays below 1000 rpm, and I cant get it to turn faster than that.
What can I do to make things better? This case fan came with the case, would replacing it help? Would adding second fan help? Has anyone added second fan to Wesena ITX7 case? I don't think there is provision in the case for mounting second fan.
Thanks for the help.