Do I need to buy a new copy of Windows 8 for my new PC if I already installed on another system?

31 Dec 2012
Windows 7
Explorer 9
31 Dec 2012 | Windows 7 | Explorer 9

Okay my parts to my custom PC is coming in a couple of days. When Windows 8 came out late october, I bought it for the $14.99 promotional offer on my windows 7 x64 laptop. I did install Windows 8 on another partition on that laptop but did not like it and deleted it.

My question is if I delete every trace of windows 8 associated to my Microsoft account and laptop, can I use the Windows 8 product key on my custom PC for a clean install?
Or Do I need to buy system builder Windows 8?

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