Just to clarify this bit.
Like I previously said, that's technically against the TOS. OEM licenses are technically tied to 1 board-1 activation. If you get a new motherboard/CPU, you're
supposed to buy a new license since you already used up that activation. But...like I said..there's ways around that - but again, are against the TOS/EULA for OEM licenses.
Edit: Ninja'd by Joe. Damn you.