If you clone it, be sure to boot from the SSD at least once without the HDD connected. Otherwise you may end up using the boot files on the old drive. The problem is that Windows uses the disk signature (or I guess volume signature) to find the boot files. If you clone the drive, both drives end up with the same signature. That's why you are better off booting with the original drive unplugged. Then at least change the signature of the old drive.