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XBOX ONE ARCHITECTURE

Daniel Mason and Joonho Han AGENDA

● History ● CPU ● Instruction Set Architecture ● GPU ● Memory ● ● One and PS4 Comparison ● Summary HISTORY

• Released on November 22, 2013

• Predecessors were the Xbox and

• Eighth generation of gaming systems

• Utilizes with many Xbox 360 games

• Around 20 million units sold FULL ARCHITECTURE CPU - AMD JAGUAR

• Runs on an AMD Jaguar APU • It uses 8 -64 bit cores, in the form of 2 quad cores, running at 1.75 GHz. • Jaguar is an improvement from its predecessor, Bobcat. • The size of the L2 cache is 2MB and is shared among all of its cores as opposed to the Bobcat’s 1MB cache per core. • Jaguar uses 4 CPU cores instead of 2 like Bobcat. This leads to an improvement in performance in multithreaded workloads. BOBCAT VS. JAGUAR ISA - X86-64

• 64 bit version of x86 instruction set • Main features include: • Pointers and long integers 64 bits long • General-purpose registers expanded from 8 to 16 • Much of program state held in registers rather than on stack. • Better performance than traditional branching code due to conditional operations being implemented using conditional move instructions • Floating-point operations implemented using register-oriented instruction set, rather than stack-based approach supported by IA32 DURANGO PROCESSOR CHIP GPU

• It uses is the AMD Durango graphics processor chip which uses the (GCN) architecture. • Uses a 28nm process • Has 768 shading units • Clock speed of 853MHz • The GPU core is relatively small. This is because there is a large 32MB of on-die RAM so there is less space for the GPU. MEMORY

GPU: • 8GB of DDR3 RAM • 5 GB is reserved for games • 3 GB is used for utility software and the operating system • The memory is connected using a 256 bit memory bus • Has a bandwidth of 68.2GB/s • Clock speed of 1066MHz

Cache: • 32MB of ESRAM • Has a bandwidth of 109GB/s for both writes and reads

OPERATING SYSTEM

• Xbox One console runs on operating system that includes the core called OneCore. • OneCore is Windows-based operating system using the Hyper-V (VMM) and Windows 10. • Hyper-V allows the Xbox One to create virtual machines on x86-64 systems. • Backward compatibility to Xbox 360 games is available by emulating a virtual Xbox 360 environment on the Xbox One. • With Windows 10, Universal Windows Platform apps became available on Xbox One allowing for a single app to be able to run on a variety of devices. XBOX ONE AND PS4 COMPARISON

Xbox One PS4 AMD 8 core CPU AMD 8 core CPU 1.75GHz CPU clock speed 1.6GHz CPU clock speed 8GB of DDR3 RAM 8GB of GDDR5 RAM 1.31 teraflop GPU 1.84 teraflop GPU SUMMARY

• The Xbox One CPU uses an AMD Jaguar APU. It utilizes 2 quad core modules with 4 x86-64 cores on each. • The memory is comprised of 8GB of DDR3 RAM and 32MB of ESRAM. • The GPU runs on an AMD graphics chip codenamed Durango which uses a GCN architecture. • Operating system contains three partitions, one for the Host OS, one for running applications, one for running games. • Xbox One has a better CPU while the PS4 has a better graphics. SOURCES • https://www.cs.cmu.edu/~fp/courses/15213-s07/misc/asm64-handout.pdf • http://www.eurogamer.net/articles/2015-06-23-xbox-one-back-compatibility-supports-xbox-360-dlc • http://www.extremetech.com/gaming/156467-xbox-one-hardware-and-software-specs-detailed-and-analyzed • https://www.extremetech.com/gaming/171735-xbox-one-apu-reverse-engineered-reveals-sram-as-the-reason-for-small-gpu • http://www.anandtech.com/show/6976/amds-jaguar-architecture-the-cpu-powering-xbox-one--4-kabini-temash/3 • https://www.extremetech.com/gaming/171735-xbox-one-apu-reverse-engineered-reveals-sram-as-the-reason-for-small-gpu • https://www.techpowerup.com/gpudb/2086/xbox-one-gpu • http://www.techradar.com/news/gaming/consoles/ps4-vs-xbox-720-which-is-better-1127315/2 • http://www.redgamingtech.com/xbox-one-the-hardware-specs-and-architecture/ • http://cdn.wccftech.com/wp-content/uploads/2014/04/Xbox-One-runs-Windows-8.jpg • http://wccftech.com/xbox-one-architecture-explained-runs-windows-8-virtually-indistinguishable/ • https://en.wikipedia.org/wiki/Xbox_One • https://en.wikipedia.org/wiki/Xbox_One_system_software • http://www.eurogamer.net/articles/digitalfoundry-the-complete-xbox-one-interview