Ah, OK.
I must admit now, I have been playing online during the past 2 days.
I have been fying exclusively the Hurricane (Rotol).
The first thing I must do is to switch off the mirror.
After that I enjoy constant 55-65fps at all moments, no stutters at all, my GPUs are constant on the 85% utlisation and I am very happy.
I needed to install a second fan inside my chassis to bring more cold air inside in order to have the GPU temperature dropping from 92°C down to 85°C but that was all.
I now need to find the courage to test without ramdrive in order to make an objective comparison.