2.6GHz vs 2.3GHz Macbook Retina

Started Jul 4, 2012 | Discussions thread
noirdesir Forum Pro • Posts: 13,096
Re: 2.6GHz vs 2.3GHz Macbook Retina

Jen Yates wrote:

Wojtek Bialy wrote:

Will 2.3GHz easily handle library of 10 000 36MP photos in LR6 while using PS CS8 running Mac OS XI ?

As others have said. In four years if you're finding things 'too slow' will an additional 10% improvement make enough of a difference?

Test it out. Fire up lightroom and try and work. After every action, close your eyes for ten seconds, then do it again but this time close your eyes for 9 seconds?

Did you notice a difference?

Okay, extreme example but 10% is a tiny increase when you think about it... and now I think about it why did I get the 2.7 over the 2.6?

My argument is usually that you get more enjoyment by not buying the fastest machine and investing the saved money into shortening your upgrade cycle. Say you put away $50 every month, that means you could buy a $1200 computer every two years or a $1800 computer every three years. If you add the resale value, you can probably buy a $1800 computer every two years (buy $1800 computer now, put away $50 every month, in two years sell your $1800 computer for $600 and you have again $1800 for a new computer). In the three year scenario, you could start with a $2400 computer, accumulate $1800 and resell for $600 to buy another new $2400 computer.

Now assume an increase in speed of 20% per year (and a 20% faster computer when going from $1800 to $2400) and a total run of six years.

  • Scenario A: 2 yr speed x, 2 yr speed 1.44x, 2 yr speed 2.07x, average speed: 1.5x or more relevantly, average work done in a given amount of time: 4.35 (2/1+2/1.44+2/2.07)

  • Scenario B: 3 yr speed 1.2x, 3 yr speed 2.07x, average speed: 1.64x, average work done: 3.95 (3/1.2+3/2.07)

Now, enjoyment of speed is highly subjective and non-linear and these assumptions here are just examples. It starts with a 20% speed increase year-over-year and a 20% speed increase for a 33% price increase (plus assumptions about depreciation, non-linear here). But a rule of thumb might be that if the price increases more than the performance (in relative terms), it might not be worth buying. The real problem of this calculation, however, is the very non-linear enjoyment of speed (eg, what might matter is how many percent you are below the top speed currently available as an average over time).

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