Upgrading Motherboard & CPU - Windows 7 (OEM)

This is my first time posting here so apologies in advance if I miss anything.
Here's my problem, I want to change my motherboard and cpu in my system, which should go fine but I am worried about reactivating the OS if this is needed (I've read that sometimes this is not needed when changing the motherboard). I have an OEM version of windows as I bought my PC from a small system builder.

Current Setup -
Intel i3 550 (3.2 Ghz)
Intel DH55TC Motherbaord

Proposed Upgrade -
Intel i5 3570K (3.4 Ghz)
Asus P8Z77-V Motherboard

Would I be able to change these components and call Microsoft after upgrading explaining that it was an upgrade and the OS is only installed on one system so they could reactive my OS?

Thank you!
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  1. Best answer
    I believe you could only reinstall it, if you are are replacing the motherboard with the same make/model. Legally the OEM version is bound to that specific motherboard. And upgrading to a new motherboard you would have to purchase another copy of windows.
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