I use a regular SSD for gaming and see no benefit using an M2 unless it requires an abnormal amount of data loading. I don't think you will notice a practical difference between loading from an M2 or SATA SSD.   Adaptors that might work are hit and miss between BIOS revisions, or just hit and miss overall. There are a few thread son here discussing them. Since they are not officially supported by Alienware, you have to rely on other user experiences with them to determine if they will work.   To replace the existing M2 with a new M2, one way of doing this is using Acronis. This is often but not always supplied by a drive manufacturer. Macrium Reflect is another popular option.   Macrium Reflect 
Hi,I have an Aurora R12 with a small SSD (256 gb) and a HDD (1TB). And I was thinking to add an additional SSD gen4 pcie, M.2 2280 from Western Digital (SN850), so that I can install games on the new SSD. I have several questions about that:1) is it possible to add a 3rd drive without having to remove one of the two already present?2)  Is it possible to plug directly this type of SSD without the need of an adapter? and do I need to buy a heatsink to avoid overheating?3) Would I benefit from the speed of the pcie4 on my aurora12 (or said otherwise, is the Bios still limiting the speed of pcie4) I'm pretty novice at adding components to a computer, so I definitely need your input on this.Thank you, Jonathan
Aurora R12, adding a WDSN850 SSD