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I have an iMac 11,1 A1312 MB953LL/A that I think has a 2.66 GHz Core i5 processor. I’ve installed 8GB of new memory and I’m installing a new 4TB hard drive. However it appears that the OS is determined by the model number instead of the hardware configuration. My model appears to be compatible with High Sierra, and I have a Snow Leopard (10.6) CD. So will I be able to upgrade to High Sierra (10.13) online after I install my OS 10.6? Thanks