The "tiny bit" is like...
Say a slice of pizza with 5 pepperoni's
lol
is PCIe 2.0
Now we drop to PCIe 1.0 - take away say 2-3 pepperoni's.
That pizza is still gonna taste dam good (especially if your hungry xD) regardless of the missing pepperoni's =).
Sorry for the analogy - i was hungry xD