OEM versions of Windows 8 are identical to Full License Retail versions except for the following:
-- OEM licenses are tied to the very first computer you install and activate it on
- OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard
Not true any more. The new license terms for Windows 8 OEM/System Builder versions allow for license transfer to a new machine (though it does not specify how many times you can perform this transfer). You can also transfer the software with the license to another person as long as you include "the original media, the certificate of authenticity, the product key and the proof of purchase directly to that other person, without retaining any copies of the software." (see below).
Can I transfer the software to another computer or user? You may transfer the software to another computer that belongs to you. You may also transfer the software (together with the license) to a computer owned by someone else if a) you are the first licensed user of the software and b) the new user agrees to the terms of this agreement. To make that transfer, you must transfer the original media, the certificate of authenticity, the product key and the proof of purchase directly to that other person, without retaining any copies of the software. You may use the backup copy we allow you to make or the media that the software came on to transfer the software. Anytime you transfer the software to a new computer, you must remove the software from the prior computer. You may not transfer the software to share licenses between computers. You may transfer Get Genuine Windows software, Pro Pack or Media Center Pack software only together with the licensed computer.