Daysher :
Hi guys.
I want to get a new build but I was planning on using my old SSD with win 10 on it so I don't have to purchase win again is that possible ?
Thanks
Since the anniversary update Microsoft has allowed us to link a digital license with a Microsoft account. This then allows you to re-activate a computer through your Microsoft account after what they describe as a "significant" hardware change. This includes "replacing" the motherboard. If you sign in using a Microsoft account on your current PC then chances are your Win10 license has already been associated with your Microsoft account.
It's unlikely that the install of Windows on your SSD will successfully boot with drastically different hardware. BUT, if you install a fresh copy of Win10 in your upgraded machine (make sure it's the same version of Win10, 64Bit Home for example), then you *might* be able to successfully activate it by entering your Microsoft account and attempting to use your existing license.
Overview from Microsoft is here:
https://support.microsoft.com/en-us/help/20530/windows-10-reactivating-after-hardware-change
Just to be clear, Microsoft has said from the outset that buying an entirely new computer requires a new Windows 10 license. This feature has been introduced for re-associating your license after a "significant hardware change". So quite where the line is drawn in a legal sense between "entirely new computer" and "significant hardware change" I don't know. The support page above clearly states that you need the same "type of device", and there's a limit to the number of times you can do this. But I don't believe they're telling anyone specifically exactly how this works or where they're drawing the line.
In any case, it might be worth a try if this is a "significant hardware change". I can't guarantee it will work.
**EDIT: I forgot to mention. If you reinstall Win10, do NOT enter a product key. Just "skip" that bit, and then once installed, go to Activation, enter your Microsoft account, and see if it will agree to associate your device with the license that should be there.
Of course - you'll also need to make sure you've linked your license with a Microsoft account BEFORE you start. That's the first section in the support page I linked above.