Could this be due to an outdated version of u-boot? I haven't had a chance to get Fedora on my BBB yet, so I don't know what version of u-boot is used/recommended in the image but I recall hearing about this in the OpenBSD mailing list:

"The last version of u-boot includes some important changes for the users

of BBB. With this version, the BBB runs at 1Ghz (now is running at

550mhz) when the board is connected to the power connector. The code was

developed by various developers of TI, so it's safe."

http://marc.info/?l=openbsd-arm&m=138100865002079&w=2

On Fri, Nov 29, 2013 at 2:04 PM, Jos Vos <jos@xos.nl> wrote:

On Fri, Nov 29, 2013 at 06:46:00PM +0000, Peter Robinson wrote:

> Are you using the same SD card for both?

Same brand, same speed and class specification, only one is 4 GB and
the other 8 GB. But when I run it multiple times (all results are
approx. the same) I guess Python etc. is in the buffer cache.

--
-- Jos Vos <jos@xos.nl>
-- X/OS Experts in Open Systems BV | Phone: +31 20 6938364
-- Amsterdam, The Netherlands | Fax: +31 20 6948204

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