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% Hardware evolution: Hardware Evolution 2008 - 2012
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Although the XO has continued to look pretty much the same on the
outside, the electronics inside have been changing. For details of the
differences, refer to:
- [http://wiki.laptop.org/go/Hardware\_specification](http://wiki.laptop.org/go/Hardware_specification)
for the XO 1.0
- [http://wiki.laptop.org/go/Hardware\_specification\_1.5](http://wiki.laptop.org/go/Hardware_specification_1.5)
- [http://wiki.laptop.org/go/XO-1.75](http://wiki.laptop.org/go/XO-1.75)
To some extent, the changes were made to keep using high volume parts,
and improve performance. The change from 1.5 to 1.75 involved a change
of the processor from x86 to arm, and a reduction in power consumption
of about 50%. With power management improvements, this permits the XO to
last more than 3.5 hours.
As you can see from the "boot time" comparison, lower power has not been
at the expense of decreased performance.
Version Hard Disk Memory Boot Time
--------- ----------- --------- -------------
XO 1.0 > 1 GB 256 MB > 76 s
XO 1.5 > 4 GB 1000 MB > 54 s
XO-1.75 > 4 GB 512 MB > 47 s
TODO: Add xo-4 info
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