This is only with OEM Software.
If you check the Retail prices of none OEM you can see that its alot more as in £69 to £250 ish
As ntdoc mentions with OEM there only vaild for that mother board.
I guess on the install you have to Authenticate it,
and that's where it all changes.
The first one to talk to microsoft will be valid i guess.
And the other will fail.
As the results show, XP is actually faster lol