If you will do a clean install, you will need a windows dvd.
They are all the same, differing only in what the activation code will allow.
I suggest you do the install and try to activete with either key. Odds are, you will be successful.
You may need to talk with MS activation to assure them that you are not running a pirated copy and that the copy of windows is being run on only one pc.
If your purpose is gaming, then using a amd cpu is probably a poor choice. Bulldozer was a big disappointment for gamers.
At every price point, a intel cpu is equal or better for gaming.
Read this article: http://www.tomshardware.com/reviews/gaming-cpu-review-overclock,3106.html
1: An FX-6300 is Vishera (Piledriver), not Bulldozer.
2: How does the value of piledriver depend on how much gamers liked bulldozer?
3: Vishera has 15% better perf.-per-core than Bulldozer. I myself don't like Zambezi.
4: A FX-6300 is 25% better at multithreading than a core i3-3220(~$140).
5: I don't have the $ to get a core i5-3570k.
6: With an avg. 20% OC, a FX-6300 will outperform the best core i3 @ gaming by 15%-20%.
7: I don't just look at the specs of a CPU and judge it like that.
8: I've got my answer.