HP 48GX cpu clock speed

[cdmackay]

I just picked up a second HP 48GX, 2002 manufacture, and was interested to note a different cpu clock speed — as shown by A in the On-D self-tests — compared to my other one (same year).

One is 3.7MHz (roughly), and one is 3.9MHz; by coincidence, both serial numbers indicate week 37 of 2002.

Is that surprising? The wikipedia article suggests that one might expect 3.9 MHz, for GX, especially later models like mine.

Or is it not that simple?

One difference is that the 3.9MHz one has two RAM cards installed, but I doubt that's relevant.

Obviously, I don't expect to notice any difference in practice, and I could consider SpeedUI were I bothered about the 48 speed anyway, so this is just out of interest

thanks!