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The original Xbox console featured a 733 MHz Intel Pentium III CPU, 64 MB of DDR SDRAM, an Nvidia NV2A GPU, and an 8 or 10 GB internal hard drive.
Here's a more detailed breakdown of the original Xbox's specifications:
CPU:
Type: Custom 32-bit 733 MHz Intel Pentium III "Coppermine-based" processor.
Architecture: 180 nm process.
Front-Side Bus (FSB): 133 MHz 64-bit GTL+ (1.06 GB/s bandwidth).
Cache: 32KB L1 cache, 128 KB on-die L2 cache.
SIMD: SSE floating point, MMX integer.
Memory:
RAM: 64 MB of DDR SDRAM (200 MHz).
Bandwidth: 6.4 GB/s (1.06 GB/s for CPU, 5.34 GB/s shared).
GPU:
Type: Nvidia GeForce 3-based NV2A.
Clock Speed: 233 MHz.
Theoretical Performance: 115 million vertices/second, 932 megapixels/second fillrate.
Real-world Performance: 250–700 megapixels/second fillrate with Z-buffering, fogging, alpha blending, and texture mapping.
Storage:
Internal Hard Drive: 8 or 10 GB (formatted to 8 GB with system reserve and MS Dash).
Memory Card: 8 MB.
Other:
Operating System: Custom, based on a heavily modified version of Windows 2000.
Graphics API: DirectX 8.1.
Online Service: Xbox Live (launched in November 2002).
Dimensions: 3.58” (91 mm) height, 12.6” (320 mm) width, 10.2” (259.1 mm) depth.
Weight: 8.8 lb (4 kg )