Modern supercomputers are built by combining thousands of small computer servers and using software to turn them into a single entity.
In that sense, any organization with enough money and expertise can buy what amount to off-the-shelf components and create a fast machine.
The Chinese system follows that model by linking thousands upon thousands of chips made by the American companies Intel and Nvidia.
Based on this quote, the members of Sevenforums have enough computing power to give them a run for their money.
(i have another 30 odd comps accessible to me in the shed to add to the tally).