Overclocker Roman Hartung (der8auer) discusses his delidding of a Threadripper CPU in a new video: he confirms that AMD is, in fact, using four functional Ryzen dies to create a single Threadripper chip. Being that AMD’s EPYC server processors are made the exact same way, der8auer speculates that the company has plans for a 32-core desktop processor (the choice of using four dies was intentional).
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Source: [H]ardOCP – Threadripper Delidding Uncovers EPYC in Disguise: 32-Core Desktop CPU in the Works?