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In page UNIVAC I:

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UNIVAC I used 6,103 vacuum tubes,[1][2] weighed 16,686 pounds (8.3 short tons; 7.6 t), consumed 125 kW,[3] and could perform about 1,905 operations per second running on a 2.25 MHz clock. The Central Complex alone (i.e. the processor and memory unit) was 4.3 m by 2.4 m by 2.6 m high. The complete system occupied more than 35.5 m2 (382 ft2) of floor space.[citation needed]