Raspberry Pi is 4.5 times faster than the Cray 1 was in 1978
roylongbottom.org.uk
From an evaluation by Roy Longbottom, this interesting observation:
In 1978, the Cray 1 supercomputer cost $7 Million, weighed 10,500 pounds and had a 115 kilowatt power supply. It was, by far, the fastest computer in the world. The Raspberry Pi costs around $70 (CPU board, case, power supply, SD card), weighs a few ounces, uses a 5 watt power supply and is more than 4.5 times faster than the Cray 1.
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And model 1 was even cheaper (but I guess these values should be indexed on inflation anyway)
I love looking that stuff up for perspective. 7 million in 1978 is $33 million today.