Vejle

Valhalla
Vejle

File:X818337.jpg Valhalla
File:X818337-delid.jpg Valhalla with IHS removed
Part Number	X818337
Introduced	2010
Designed By	ATi IBM Microsoft NEC (eDRAM)
Type	XCGPU
Used In	Trinity Corona
Clock Speed	3.2GHz (CPU) 500MHz (GPU)
Cache	L1: 32KB/32KB (CPU) L2: 1MB (CPU)
Memory	10MB eDRAM (GPU)
Instruction Set	PowerPC RISC (CPU)
Cores	3 (CPU)
Threads	6 (CPU)
Process	45nm (CGPU die) 65nm (eDRAM die)
Package	Flip-chip BGA1155
Predecessor	Loki (CPU) Kronos (GPU)
Successor	Winchester CGPU

Valhalla (also known as Vejle) is the first XCGPU used in the Xbox 360. It is the successor to Loki CPU and Kronos GPU, and is manufactured on the 45nm process (except for the eDRAM daughter-die, which remains at 65nm). Valhalla adds an Integrated Heat Spreader over the dies.

Specifications

CPU

• 3 two-way SMD-capable RISC cores clocked at 3.2GHz
• SIMD: Two VMX128 units
• 32KB L1 data cache
• 32KB L1 instruction cache
• 1MB L2 cache at 1.6 GHz with a 256-bit bus
• 21.6GB/s FSB
• 768 bits of IBM eFUSE One-Time-Program memory for fusesets
• One-Time-Programmable ROM and 64KB SRAM for the 1BL and Config Ring
• Big-endian architecture
• 45nm process

GPU

• 500Mhz clock speed
• 48 floating-point vector processors divided into 3 dynamically scheduled SIMD groups (16 each)
• Unified shader architecture
• 16 texture addressing units
• 16 texture filtering units
• 8 pixel rendering pipelines
• Direct access to CPU L2 cache
• 45nm process

eDRAM

• 10MB 256GB/s eDRAM
• Contains logic for:
  • 4-sample anti-aliasing
  • Alpha compositing
  • Color
  • Z/stencil buffering
• 65nm process

Details

• Part Number: X818337
• Foundries:
  • Canada Foundry