Northbridge
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The Xbox 360's North Bridge is integrated into the system's Xenos (GPU) and shares a memory controller with it.
- 128-bit GDDR3 Memory Controller @ 1.4GHz (22.4GB/s)
- 700 MHz 512MB Samsung GDDR3 RAM (8 chips, each 512Mbit by 16 bits)
- Shared System/Graphics memory
- (5.6GB/s per chip)
- 90nm Process
- 500MB/s read/write (1GB/s total) SIS Southbridge interface (PCI express)