HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 46

System Board Memory Controller Hub (82850) Feature Feature • Processor/system bus: - Supports Pentium IV processor at 100MHz system bus frequency (400MHz data bus) - Provides an eight-deep In-Order Queue that supports as many as eight outstanding transaction requests on the system bus - Desktop optimized AGTL+ bus driver technology with integrated AGTL + termination resistors - Support for 32-bit system bus address • Memory Controller • Accelerated Graphics Port (AGP) interface: - Single 1.5V AGP Pro connector - AGP 2.0 compliant, including AGP 4x data transfers and 2x/4x Fast Write protocol - AGP 1.5V connector support with 1.5V signalling only - AGP PIPE# or SBA initiated accesses to DRAM is not snooped - AGP FRAME initiated accesses to DRAM are snooped (snooper identifies that data is coherent in cache memory) - Hierarchical PCI configuration mechanism - Delayed transaction support for AGP-to-DRAM reads that cannot be serviced immediately Direct Rambus: • Dual Direct Rambus Channels operating in lock-step (both channels must be populated with a memory module). Supporting 300MHz or 400MHz • RDRAM 128Mbit and 256Mbit devices • Minimum upgrade increment of 32MB using 128Mbit DRAM technology • Hub Link 8-bit interface to ICH2: - High-speed interconnect between the MCH and ICH2 (266MB/sec) • As many as 64 Direct Rambus devices • Dual-channel maximum memory array size is: - 1GB using 128Mbit DRAM technology - 2GB using 256Mbit DRAM technology • As many as eight simultaneous open pages: - 1KB page size support for 128Mbit and 256Mbit RDRAM devices - 2KB page size support for 256Mbit RDRAM devices - 46 Chapter 2