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The original 128K Mac was 13.6” high, 9.6” wide, 10.9” deep (35.4 x 24.4 x 26.4 cm) and 16.5 lb (7.5 kg). Today’s Mac Pro is 9.9″ by 6.6″ (25 by 17 cm) and weighs 11 lb (5 kg) — smaller, shorter, and lighter than its ancient progenitor. Open your hand and stretch your fingers wide: The distance from the tip of your pinky to the tip of your thumb is in the 9 to 10 inches range (for most males). This gives you an idea of how astonishingly small the Mac Pro is.
At 7 teraflops, the new Pro’s performance specs are impressive…but what’s even more impressive is how all that computing power is stuffed into such a small package without everything melting down. Look inside the new Mac Pro and you’ll find a Xeon processor, twin AMD FirePro graphics engines, main memory, a solid-state “drive”, driven by 450W of maximum electric power… and all cooled by a single fan. The previous Mac Pro version, at only 2 teraflops, needed eight blowers to keep its GPU happy.
Interesting story linking energy density, Seymour Cray, the Bell Labs and the 64bit A7 chip... not mentioning the Mac Pro's real size.