Windows 7: whats the difference in these two licenses??

Microsoft Windows 7 Home Premium 64-bit 1-Pack for System Builders - OEM




Microsoft Windows 7 Home Premium SP1 64-bit English 1-Pack - OEM


What is the system builders??? what exactly does it do for me, is there a difference on how many times i can use it or what? or they are the same, one just locks it to the mobo and the other doesn't, Shine me with your infinite knowledge of computers guys

1) Any "OEM" copy that you can buy from a store is system builders (as contrasted with the royalty oem copies that come PREINSTALLED when you buy a branded computer).

2) A system builder copy was originally meant to be sold to white box vendors who would then install it on a computer meant for resale to a 3rd party. So if you bought a PC from a mom and pop store, thats what you would find. The EULA was abused later by coupling the license to an insignificant piece of hardware such as a mouse.

In Windows 7 at least, system builder copies are freely available from respected stores like newegg and tigerdirect which leads to the conclusion that MS is OK with it.

3) System builder is cheaper than retail copies because legally they are tied to the first mobo they are installed on, they are NOT transferrable. Second, MS support is not bundled with them.