F11: x86_64: Different boot styles

[lanas]

I've installed F11 x86_64 on two 64-bits machines from the very same
DVD and the two machines boot in a different manner:

1st : by showing a blue/white horizontal bar at the bottow of the
screen.  This boot method seems slow.

2nd: by showing a slanted 'teardrop' in the middle of the screen that
quickly shows the Fedora logo.  This boot method is faster.

Why are there two different ways of booting on two x86_64 machines from
the very same DVD ?  What is the mechanism that lead to these two
different approaches ?