HP Workstation x4000 hp workstation x4000 - Technical Reference manual - Windo - Page 40
x4000 8-RIMM Memory Expander Card, System Memory,
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System Memory and Processors System Memory Figure 3-1 x4000 8-RIMM Memory Expander Card 2A (J6) 1A (J5) 4A (J8) 3A (J7) 4B (J4) 3B (J3) 2B (J2) 1B (J1) The eight-RIMM MEC uses two memory repeater hubs for RDRAM (MRH-R). Each MRH-R supports two Direct RDRAM channels with two RIMMs per channel. The Memory Controller Hub (MCH) interfaces to the MEC using an expansion channel for each MRH-R. The MEC supports 400 MHz operation delivering up to 3.2 GB/s memory bandwidth using two expansion channels operating in lock step. The expansion channel is a super set of the Direct RDRAM channel using an additional two Rambus Signaling Levels (RSL) to communicate channel and control information from the MCH to the MRH-R. The RDRAM memory interface can achieve greater than 95% use of the maximum bandwidth. 40 Chapter 3
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