YEAH! I would love to see an article on energy to make vs. to use. I have seen numbers from 66% in use to 20% in use.
The second page of this article, Life Cycle Analysis and Eco PC Review
, cites a major study that appeared in the first serious book on the environmental impact of computers.
Here, also, is an abstract of the piece:
The total energy and fossil fuels used in producing a desktop computer with 17-inch CRT monitor are estimated at 6,400 megajoules (MJ) or 260 kg respectively. This indicates that computer manufacturing is energy intensive: the ratio of fossil fuel use to product weight is 11, an order of magnitude larger than the factor of 1-2 for many other manufactured goods. This high energy intensity of manufacturing, combined with rapid turnover in computers, results in an annual life cycle energy burden that is surprisingly high: about 2,600 MJ per year, 1.3 times that of a refrigerator. In contrast with many home appliances, life cycle energy use of a computer is dominated by production (81%) as opposed to operation (19%). Extension of usable lifespan (e.g. by reselling or upgrading) is thus a promising approach to mitigating energy impacts, as well as other environmental burdens associated with manufacturing and disposal.
This is all based on the assumption of a 3-yr usable life, which is typical. Lengthen the life, and the percentages obviously change.