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:
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.
XO-4 is available in two models, XO-4 and XO-4 Touch. XO-4 provides multi touch input on the display.
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 |
| XO-4 | 4 or 8 GB | 1 or 2 GB | 38 s |