System Builder Question

What is the difference between

Microsoft Windows 7 Professional Upgrade


Microsoft Windows 7 Professional SP1 64-bit - OEM

It seems most recommend the service pack option when building - What am I not getting? Is that possible? What's the actual difference?

I can't seem to find any information out there with details on which is the better choice. I understand the basic concept of the service pack, but maybe I'm missing something obvious.

I figure there is a simple answer out there, hope you all can help!

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  1. Look like I found an answer. Feel free to close/lock this :P
  2. The SP1 will save you a lot of time with ungrades to Win 7 after you install Win 7 without SP1.

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