Computing capacity worldwide was probably around 2 x 1020 – 1.5 x 1021 FLOPS, at around the end of 2015.

## Support

We are not aware of recent, plausible estimates for hardware capacity.

Vipul Naik estimated global hardware capacity in February 2014, based on Hilbert & Lopez’s estimates for 1986-2007. He calculated that if all computers ran at full capacity, they would perform 10-1000 zettaFLOPS, i.e. 1022 – 1024 FLOPS.1 We think these are substantial overestimates, because producing so much computing hardware would cost more than 10% of gross world product (GWP), which is implausibly high. The most cost-efficient computing hardware we are aware of today are GPUs, which still cost about \$3/GFLOPS, or \$1/GFLOPSyear if we assume hardware is used for around three years. This means maintaining hardware capable of 1022 – 1024 FLOPS would cost at least \$1013 – \$1015  per year. Yet gross world product (GWP) is only around \$8 x 1013, so this would imply hardware spending constitutes more than 13% – 1300% of GWP. Even the lower end of this range seems implausible.2

One way to estimate global hardware capacity ourselves is based on annual hardware spending. This is slightly complicated because hardware lasts for several years. So to calculate how much hardware exists in 2016, we would ideally like to know how much was bought in every preceding year, and also how much of each annual hardware purchase has already been discarded. To simplify matters, we will instead assume that hardware lasts for around three years.

It appears that very roughly \$300bn-\$1,500bn was spent on hardware in 2015.3 We previously estimated that the cheapest available hardware (in April 2015) was around \$3/GFLOPS. So if humanity spent \$300bn-\$1,500bn on hardware in 2015, and it was mostly the cheapest hardware, then the hardware we bought should perform around 1020 – 5 x 1020 FLOPS. If we multiply this by three to account for the previous two years’ hardware purchases still being around, we have about  3 x 1020 – 1.5 x 1021 FLOPS.

This estimate is rough, and could be improved in several ways. Most likely, more hardware is being bought each year than the previous year. So approximating last years’ hardware purchase to this years’ will yield too much hardware. In particular, the faster global hardware is growing, the closer the total is to whatever humanity bought this year (that is, counterintuitively, if you think hardware is growing faster, you should suppose that there is less of it by this particular method of estimation). Furthermore, perhaps a lot of hardware is not the cheapest for various reasons. This too suggests there is less hardware than we estimated.

On the other hand, hardware may often last for more than three years (we don’t have a strong basis for our assumption there). And our prices are from early 2015, so hardware is likely somewhat cheaper now (in early 2016). Our guess is that overall these considerations mean our estimate should be lower, but probably by less than a factor of four in total. This suggests 7.5 x 1019 – 1.5 x 1021 FLOPS of hardware.

However Hilbert & Lopez (2012) estimated that in 2007 the world’s computing capacity was around 2 x 1020 IPS (similar to FLOPS) already, after constructing a detailed inventory of technologies.4 Their estimate does not appear to conflict with data about the global economy at the time.5 Growth is unlikely to have been negative since 2007, though Hilbert & Lopez may have overestimated. So we revise our estimate to 2 x 1020 – 1.5 x 1021 FLOPS for the end of 2015.

This still suggests that in the last nine years, the world’s hardware has grown by a factor of 1-7.5, implying a growth rate of 0%-25%. Even 25% would be quite low compared to growth rates between 1986 and 2007 according to Hilbert & Lopez (2012), which were 61% for general purpose computing and 86% for the set of ASICs they studied (which in 2007 accounted for 32 times as much computing as general purpose computers).6 However if we are to distrust estimates which imply hardware is a large fraction of GWP, then we must expect hardware growth has slowed substantially in recent years. For comparison, our estimates are around 2-15% of Naik’s lower bound, and suggest that hardware constitutes around 0.3%-1.9% of GWP.

Such large changes in the long run growth rate are surprising to us, and—if they are real—we are unsure what produced them. One possibility is that hardware prices have stopped falling so fast (i.e. Moore’s Law is ending for the price of computation). Another is that spending on hardware decreased for some reason, for instance because people stopped enjoying large returns from additional hardware. We think this question deserves further research.

## Implications

### Global computing capacity in terms of human brains

According to different estimates, the human brain performs the equivalent of between 3 x 1013 and 1025 FLOPS. The median estimate we know of is 1018 FLOPS. According to that median estimate and our estimate of global computing hardware, if the world’s entire computing capacity could be directed at running minds around as efficient as those of humans, we would have the equivalent of 200-1500 extra human minds.7 That is, turning all of the world’s hardware into human-efficiency minds at present would increase the world’s population of minds by at most about 0.00002%. If we select the most favorable set of estimates for producing large numbers, turning all of the world’s computing hardware into minds as efficient as humans’ would produce around 50 million extra minds, increasing the world’s effective population by about 1%.8

Figure: Projected number of human brains equivalent to global hardware under various assumptions. For brains, ‘small’ = 3 x 10^ 13, ‘median’ = 10^18, ‘large’ = 10^25. For ‘world hardware’, ‘high’ =2 x 10^20, ‘low’ = 1.5 x 10^21. ‘Growth’ is growth in computing hardware, the unlabeled default used in most projections is 25% per annum (our estimate above), ‘high’ = 86% per annum (the apparent growth rate in ASIC hardware in around 2007).

1. “My current guesstimate for total computation being done would be 0.1-10 zettaFLOPS and current estimate for how much computation can be done if all computers ran at full capacity would be 10-1000 zettaFLOPS (but this would entail prohibitive energy costs and not be sustainable).”

– Vipul Naik, research notes

2. One might wonder if the total stock of hardware seems high because hardware lasts for much longer than three years. This probably does not account for it, because the growth rate is high enough that even if substantially older hardware persisted, it would make up a small share of total hardware. For instance in 2007 the world’s computing capacity (for the general purpose and application specific computers Hilbert & Lopez estimated) was only 2 x 1020 IPS (similar to FLOPS), roughly 0.02%-2% of Naik’s estimate.

3. “In 2012, the worldwide computing hardware spending is expected at 418 billion U.S. dollars.” – Statista

Statista’s figure of ‘Forecast hardware spendings worldwide from 2013 to 2019 (in billion U.S. dollars)’ reports a 2013 figure of \$987bn, increasing to \$1075bn in 2015. It is unclear why these spending forecasts differ so much from Statista’s reported 2012 spending.

Statista also reports a prediction of 2016 hardware revenue at \$409bn Euro, which is around \$447bn USD. It looks like the prediction was made in 2012. Note that revenue is not identical to spending, but is probably a reasonable proxy.

For 2009, Reuters reports a substantially lower revenue figure than Statista, suggesting Statista figures may be systematically high, e.g. by being relatively inclusive:

“The global computer hardware market had total revenue of \$193.2 billion in 2009, representing a compound annual growth rate (CAGR) of 5.4% for the period spanning 2005-2009.” – Research and Markets press release, Reuters,

Statista‘s figure indicates revenue of 296 billion Euros, or around \$320 billion USD in 2009 (this is the same figure as for 2007, which may be the only number you can see without a subscription—so while it may look like we made an error here, we do have the figure for the correct year). This is around 50% more than the Research and Markets press release.

From these figures we estimate that spending on hardware in 2015 was \$300bn-\$1,500bn

4. “It is written from the perspective of the results of our recent inventory of 60 technological categories between 1986 and 2007 (measured in bits and MIPS [million-instructions-per-second])…”

“…The combined capacity of both groups of computers has grown from 730 tera-IPS in 1986 (73010^12 instructions per second), over 22.5 peta-IPS in 1993 (22.510^15 instructions per second), to 1.8 exa-IPS in 2000 (1.810^18 IPS), and 196 exa-IPS in 2007 (or roughly 210^20 instructions per second).”

–  Hilbert & Lopez (2012)

5. In 2007, GWP was probably about \$66T (in 2007 dollars). According to Hilbert & Lopez, the world could then perform 2 x 1020 IPS, which is  2 x 1014 MIPS. According to Muehlhauser & Rieber, hardware cost roughly \$5 x 10-3/MIPS in 2007. Thus the total value of hardware would have been around \$5 x 10-3/MIPS x 2 x 1014 MIPS = \$1012 (a trillion dollars), or 1.5% of GWP.
6. “The respective compound annual growth rates between 1986–2007 were 61% for general-purpose computations and 86% for application-specific computations, which is 10 and 14 times faster than global GDP during that period, respectively.”

Hilbert & Lopez (2012)

7. 2 x 1020 /1018  = 2 x 102

1.5 x 1021/1018=1.5 x 103

8. 1.5 x 1021 FLOPS of hardware divided by 3 x 1013 FLOPS/brain gives us 5 x 107 minds.