Part two! The extra RAM stick is installed, and now Terminal says:
phil-laceys-imac-g5:~ Phil$ ioreg -p IODeviceTree -n memory -S | grep ram-
| “ram-layout-architecture” = <00000002>
| “ram-bus-width” = <00000080>
I’m slightly confused, as the “architecture” value is unchanged, but the “bus width” value is now 80 instead of 40.
So does that mean I’ve changed from 64-bit to 128-bit or not?!?
Startup from cold now takes 38 seconds (18 seconds faster), and iPhoto takes 9 seconds to load (6 seconds faster).
I’m not sure whether these speed improvements are down to just having twice as much RAM, a 128-bit pipeline or a combination of both.
I fear there needs to be some research done. I feel an email to Apple coming on. :o)
Not sure whether this is at all relevant, but 00000040 is hexadecimal for 64, and 00000080 is hexadecimal for 128.
Clear as mud.