Guys, do you have a system monitoring your GPU while you fly? (vram usage, GPU usage, GPU MHz, temp)?
Because it may be that your card switches to "slow" mode for whatever reason.
Just an idea, I am a NV guy so I can not give you more concrete help as all my tools are for NVIDIA but the first thing I experienced running both my GPUs in SLI was overheatting (92°C). And after overheatting most GPUs will throttle back.
Just in case it helps anyone.
~S~
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