Win 7 Sp1 x64

[lovingGamer]

Wtf is Sp1?

[Ganz]

Sp1 would refer to Service Pack 1.  Think of it like a patch for windows.  If windows kept the naming scheme Windows 8.1 would actually be called Windows 8 Sp1

[Taswell]

Microsoft is done with consumer Service packs as far as i know, So it doesnt matter anymore

[lovingGamer]

Microsoft is done with consumer Service packs as far as i know, So it doesnt matter anymore

so it doesn't matter at all?.

[LinusDropTips]

Service Packs are compilations of updates for a Windows operating system. They are distinct form "regular" updates in that they are fully validated my Microsoft and shouldn't cause any issues (which is important for businesses that can't afford down-time and tech support calls, especially those with Windows servers). The OS install media will be released several times, each with a new Service Pack (for example Windows 7 has "Windows 7", "Windows 7 SP1", and "Windows 7 SP1 U" install media).

I hope this helps, feel free to ask if you have any more questions

 

EDIT: The Service Pack version of your install media won't affect the installation or usage of your product so long as you have a legitimate Windows key for that SKU (eg. Windows 7 Pro).