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#1301
Hi imacken
The 1650MHz is the advertised speed of your card. The higher speed readings shown in the benchmarks are caused by NVIDIA Boost. It is a feature that allows the card too boost beyond it's stock speed. As the GPU core temperature increases the boost speed is automatically lowered to keep the core temperature from increasing to a point that will force it to thermal throttle. Each benchmark uses a different method to determine the maximum speed.
Heaven sometimes show the maximum reading for my 1070ti as 2138MHz when the card is cold, but any runs there after it will show 2100MHz as the maximum.