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H8DMT/H8DMT-IBX/H8DMT-F/H8DMT-IBXF User's Manual
nVidia MCP55 Pro Chipset Media and Communications
Processor
The nVidia MCP55 Pro Chipset is a single-chip, high-performance HyperTransport
peripheral controller. It includes a 28-lane PCI Express interface, an AMD Opteron
16-bit Hyper Transport interface link, a four-port Serial ATA interface, a dual-port Gb
Ethernet interface, a dual ATA133 bus master interface and a USB 2.0 interface. This
hub connects directly to the CPU.
HyperTransport Technology
HyperTransport technology is a high-speed, low latency point to point link that was
designed to increase the communication speed by a factor of up to 48x between
integrated circuits. This is done partly by reducing the number of buses in the chipset to
reduce bottlenecks and by enabling a more efficient use of memory in multi-processor
systems. The end result is a significant increase in bandwidth within the chipset.
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PC Health Monitoring
This section describes the PC health monitoring features of the H8DMT/H8DMT-IBX/
H8DMT-F/H8DMT-IBXF serverboard. The serverboard has an onboard System
Hardware Monitor chip that supports PC health monitoring.
Onboard Voltage Monitors
The onboard voltage monitor will continuously scan crucial voltage levels. Once a
voltage becomes unstable, it will give a warning or send an error message to the screen.
Users can adjust the voltage thresholds to define the sensitivity of the voltage monitor.
Real time readings of these voltage levels are all displayed in BIOS.
Fan Status Monitor with Firmware/Software Speed Control
The PC health monitor can check the RPM status of the cooling fans. The onboard fans
are controlled by thermal management via BIOS.
CPU Overheat/Fan Fail LED and Control
This feature is available when the user enables the CPU overheat/Fan Fail warning
function in the BIOS. This allows the user to define an overheat temperature. When this
temperature is exceeded or when a fan failure occurs, the Overheat/Fan Fail warning
LED is triggered.
Auto-Switching Voltage Regulator for the CPU Core
The 3-phase-switching voltage regulator for the CPU core can support up to 80A and
auto-sense voltage IDs ranging from 0.8 V to 1.55V. This will allow the regulator to run
cooler and thus make the system more stable.
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