Answer to "NVME M.2 SSD with adapter"Samsung has updated firmare for the SSD 970 Evo Plus PCIe NVMe, this is the direct link. Now it works on Macs https://www.globalmac.cl/SSD-Samsung-970-Evo-M2-NVMe-1TB Best Regards! Alex
Answer to "Best possible processor for my iMac 2012 i5"Hi, Regarding SSD NVMe upgrade options for intel iMac: • If your iMac is 27” Late-2013 or newer, it has PCIe slot (both “FusionDrive” and “HDD” models). • If your iMac is 21.5” with FusionDrive from Apple, it has PCIe slot with one small Apple SSD. • Apple PCIe slot is compatible with Samsung 970 Evo Plus M.2 NVMe SSD (firmware updated) plus Sintech adapter. Adata Pro NVMe SSD is cheaper and good too. Both are twice as fast compared to the original Apple SSDs. • macOS High Sierra required. (Upgrade Macs is my favorite work at www.globalmac.cl) Good luck!