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Advanced Micro Devices, Inc. (AMD) is an American multinational corporation and fabless semiconductor company that designs, develops and sells computer processors and related technologies for business and consumer markets.

AMD's main products include microprocessors, motherboard chipsets, embedded processors, and graphics processors for servers, workstations, personal computers, and embedded system applications. The company has also expanded into new markets, such as the data center, gaming, and high-performance computing markets. AMD's processors are used in a wide range of computing devices, including personal computers, servers, laptops, and gaming consoles.

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BrikoX

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AMD Ryzen 9000X3D rumored to reverse the 3D stacking hierarchy — the L3 cache block allegedly sits below the CCDs (www.tomshardware.com)

submitted 3 weeks ago by BrikoX to c/amd

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So that's where the higher clock speeds and better thermals stem from.

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[–] [email protected] 3 points 3 weeks ago

Would make a lot of sense to me.

L3 would connect on one side to the cores, but on the other to the memory controllers. In this configuration the memory connection won't need to go back to the CCX die only to get routed directly to the IO die.
With the CCX die on top, it should make getting the heat out of it a lot easier. It's no longer got the L3 die sitting on it like a blanket.

The drawback is that there's probably more logic on the L3 die to be able to deal with all signals passing from the CCX to other chiplets.