iMac (21.5-inch, Late 2013) - Technical Specifications
iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
Upgrading an iMac — Buchanan Consulting
Differences Between Late 2013 iMacs (Tapered Aluminum): EveryMac.com
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
Stayin' Alive: Upgrading the CPU, Hard Drive, and RAM on a 2006 iMac
What should you take into consideration when upgrading the processor of a PC? - Quora
iMac not powering up after upgrade (RAM, SSD, CPU thermal transfer) | MacRumors Forums
Apple iMac 21.5インチ Late 2013 Intel R Core TM i5-4570R CPU @ 2.70GHz 8GB HDD 1TB High Sierra 一体型 PC T5235910(iMac)|売買されたオークション情報、yahooの商品情報をアーカイブ公開 - オークファン(aucfan.com)
late 2013 imac proccesor upgrade help | MacRumors Forums
Apple finally adds upgradeable CPU and RAM on 4K iMac | Cult of Mac
iMac 27" Late 2013 Full Upgrade Process CPU, SSD, RAM | Shades Of Tech ⬡ - YouTube
iMac Pro Teardown Highlights Modular RAM, CPU and SSD Along With Redesigned Internals - MacRumors