Land grid array sockets for server applications
IBM Journal of Research and Development
A power, packaging, and cooling overview of the IBM eServer z900
IBM Journal of Research and Development
An advanced multichip module (MCM) for high-performance UNIX servers
IBM Journal of Research and Development
First- and second-level packaging of the z990 processor cage
IBM Journal of Research and Development
Hybrid cooling with cycle steering in the IBM eServer z990
IBM Journal of Research and Development
RAS design for the IBM eServer z900
IBM Journal of Research and Development
First- and second-level packaging of the z990 processor cage
IBM Journal of Research and Development
The evolution of build-up package technology and its design challenges
IBM Journal of Research and Development - POWER5 and packaging
High-speed interconnect and packaging design of the IBM System z9 processor cage
IBM Journal of Research and Development
Packaging design of the IBM system z10 enterprise class platform central electronic complex
IBM Journal of Research and Development
Power and thermal monitoring for the IBM system z10
IBM Journal of Research and Development
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The z990 eServerTM central electronic complex (CEC) houses four multichip-module-based processor units instead of one, as in the previous-generation z900 eServer. The multichip module (MCM) input/output pin density in z990 processor units is more than twice that of the MCMs in z900 processor units. This increase in packaging density and the consequent tripling of the current drawn by the processor units were accommodated by the first-time use of land grid array (LGA) MCM-to-board interconnections in an IBM zSeries® eServer. This was done by using innovative refrigeration cooling of the MCM with air cooling as backup, and by a new mechanical packaging and power distribution scheme. This paper describes the mechanical engineering of the CEC cage, the LGA MCM-to-board interconnection scheme, and the mechanical isolation of the MCM evaporator-heat-sink mass from the LGA contacts. The paper also describes the electrical power and the cooling solutions implemented to meet the more demanding requirements of the denser CEC package.