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.
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):
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.