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I took the blade ssd out of a Mid 2012 Retina MacBook Pro, i was wondering if i could use it in this or do i have to go SATA?

The 2012 model uses a custom mSATA blade SSD. Sadly it does not offer support for the better PCIe /NVMe drives. Here’s a good reference and source for the correct drives The Ultimate Guide to Apple’s Proprietary SSDs and the guide to put it in iMac Intel 27" EMC 2546 Blade SSD Replacement