Hmmm. So in 7 years it depreciated from $35e6 to $35e3. Thousand fold depreciation corresponds to \log_2(1000) ~= 10 halvings in 7 years = 84 months, so about o

Hmmm. So in 7 years it depreciated from $35e6 to $35e3. Thousand fold depreciation corresponds to \log_2(1000) ~= 10 halvings in 7 years = 84 months, so about one halving every 8.4 months. Moore's law is generally reported to be doubling of transistor density every 18 months -- though of course the analogous laws in storage and the like have varying time constants (e.g. GPUs were at one point moving a lot faster). This depreciation would then be at roughly double the speed of Moore's law (i.e. 8.4 rather than 18 months).