Specifications

Main Board QSSC-S4R Technical Product Specification
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2.2.2 Intel® 7500 Chipset
The Intel® 7500 Chipset (Boxboro I/O Hub) component provides a connection point between various I/O components
and Intel
® QuickPath Interconnect (Intel® QPI) based processors.
Intel® 7500 Chipset provides the following:
y Four independent processor buses
y Fully connected sockets (with 4 Intel® QuickPath interconnects per socket)
y Several PCIe* I/O subsystems
y CPU-integrated memory controller
y Registered DDR3 800/978/1066 MHz via on-board memory buffer (Intel® 7500 Scalable Memory Buffer)
y RAS features supported on system QSSC-S4R:
- Memory demand and patrol scrubbing
- System Recovery from Uncorrected Data Errors*
- DRAM SDDC (x4 or x8 Single Device Data Correction)
- Intel® SMI retry
- QPI Link retry
- QPI CRC (8-bit or 16-bit rolling)
- On-die error correction
- Memory Lockstep Mode
- DIMM and Rank Sparing
- Intra– and Inter–socket Memory Mirroring
- Intel® Scalable Memory Interconnect (Intel® SMI) lane failover
- Intel® SMI Clock fail-over
- QPI Clock fail-over
- QPI Self-Healing
- QPI Poisoning and Viral Mode
- Mirrored Memory Board Hot Add / Remove
- PCI-e hot plug
- DIMM isolation
- Memory board hot add
- OS Memory on-lining (capacity change)*
* Feature requires OS support.
2.2.2.1 Intel® 7500 Chipset Feature Summary
The IOH provides the interface between the processor Intel QPI and industry-standard PCI Express* components. The
two Intel QPI interfaces are full-width links (20 lanes in each direction). The two x16 PCI Express Gen2 ports are also
configurable as x8 and x4 links compliant to the PCI Express Base Specification, Revision 2.0. The single x4 PCI
Express Gen2 port can bifurcate into two independent x2 interfaces. In addition, the legacy IOH supports a x4 ESI link
interface for the legacy bridge. For MP platforms, non-legacy IOHs also support an additional x4 PCI Express Gen1
interface. Refer to
Figure 3 Intel® 7500 Chipset High-Level Block Diagram for a high-level view of the IOH and its
interfaces. The IOH supports the following features and technologies:
x Intel
® QuickPath Interconnect MP-small profile
x Intel
® QuickPath Interconnect MP-enterprise profile (Boxboro-MC platform only) Interface to CPU or other IOH
(limited configurations)
x PCI Express Gen2
x Intel
® I/O Accelerated Technology (Intel® I/OAT) Gen3 (updated DMA engine with virtualization enhancements)