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HPC can mean anything you want it to be.
In general "High Performance" is relative to the state-of-the-art.
What is "High Performance" today is generally "Old Hat", 5 years from now....
That may be true if you look only at the hardware. The other part of HPC is the software which is tweaked to actually fully use the hardware capabilities: that most people have the equevalent of a 10-year-old Supercomuter under their desk does not mean they are doing high performance computing...