Xbox Series X Developer Kit Teardown Unveils 40GB GDDR6 Memory, Features 20 Samsung Dies At 14Gbps

GamersNexus has confirmed in a teardown video that the Xbox Series X Devkits will have 40GB of GDDR6 memory onboard the motherboard.

Xbox Series X Devkits Confirmed With 40GB GDDR6 Memory In 20 Samsung Dies, Teardown Reveals

Currently, the Microsoft Xbox Series X consoles shipped to gamers worldwide have 16 GB of full system memory. Although the memory is made entirely of GDDR6, it is divided into two segments, a faster 10 GB segment operating at 560 GB/s (14 Gbps @ 320-bit) and a slower 6 GB segment operating at 336 GB/s (14 Gbps @ 192-bit). That is the configuration used for all XSX consoles, but the developer kits contain more than twice as much memory as the top console.

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In the teardown you can see that Steve Burke is shocked by the fact that the Xbox Series X has 10 GDDR6 memory chips on the back and 10 on the front as well. These particular dies are referred to as the ‘K4ZAF325BM-HC14’ SKU, with a capacity of 16 Gb (2 GB) per die and memory speeds of up to 14 Gbps. These memory chips run over a 320-bit bus interface and offer a bandwidth of up to 560 GB/s. That’s the same bandwidth as the Xbox Series X, but split across all of the memory dies rather than using a segmented approach as the retail unit.

Xbox Series X Devkit PCB shots (Image Credits: GamersNexus):

Now the main reason for having such huge memory pools onboard the Xbox Series X devkit is quite obvious. They are designed for developers and a 40 GB GDDR6 buffer can help debug the game with uncompressed textures while it is not optimized yet. It’s a comically large memory buffer for anything but developer use. The current flagship graphics card for gaming desktops comes with a 24GB GDDR6 memory capacity, so the XSX Devkit offers 66% of that. Only a workstation card like the RTX A6000 offers a comparable amount of memory with 48 GB GDDR6 and that thing costs a fortune (about $5000 US).

Besides the huge memory pool, some other interesting parts of the Xbox Series X Devkit teardown are the cooling design. The case that resembles the Xbox One console has a large blower-style and a smaller blow-type cooler that directs air out of the chassis. The larger fan sits atop a large heat sink that covers the Xbox Series X ‘Project Scarlett’ SOC. It contains a copper block composed of aluminum fins and copper heat pipes. The whole block is one big vapor chamber and has padded surfaces that contact the GDDR6 memory dies.

Series X Devkit Cooling Teardown (Image Credit: GamersNexus):

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Unfortunately, these specs and design are only limited to Microsoft’s Xbox Series X devkits, and even if you can find one from online listings, you won’t be able to play games on it because the system will lock you out immediately.

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