Until the 1990s, scaling up was almost always a more cost-effective strategy to increase available computer power because communication between computers was extremely slow compared with communication between a single computer's components.

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This statement is true. Before the 1990s, communication between computers was much slower than communication between a single computer's components, making scaling up a more cost-effective strategy to increase available computer power.

Until the 1990s, Scaling Up Was Almost Always a More