Browse Prior Art Database

Redirecting Airflow Based on DIMM Activity

IP.com Disclosure Number: IPCOM000099032D
Original Publication Date: 2005-Mar-09
Included in the Prior Art Database: 2005-Mar-09
Document File: 9 page(s) / 837K

Publishing Venue

IBM

Abstract

The key of the invention is to calculate how much power groups of DIMMS are consuming and to prioritize airflow across various groups of DIMMS to best utilize available cooling and to do so quicker than existing solutions and to reduce thermal excursions below existing solutions.

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Redirecting Airflow Based on DIMM Activity

    Figure 1 shows the top view of a first embodiment with eight DIMMS organized in two groups with only one group of DIMMS populated. The memory controller detects this situation and positions the air diverters to favor the populated DIMMS.

    Figure 2 shows a first embodiment with eight DIMMS organized into two groups of four and with the applications running in the left group consuming more power than the right group. This invention detects the application load imbalance and diverts airflow over the DIMMS to give priority to the devices consuming the higher power.

    Figure 3 shows a first embodiment with eight DIMMS organized into two groups of four and with the applications running in the left group consuming similar power to the right group. This invention detects the application load as balanced and does not divert airflow but allows it to be evenly distributed.

    Figure 4 shows a first embodiment with eight DIMMS organized into two groups of four and with the applications running in the right group consuming more power than the left group. This invention detects the application load imbalance and diverts airflow over the DIMMS to give priority to the devices consuming the higher power.

    Figure 5 the upper diagram shows the top view with connecting rods. There is one rod connecting the left group, another rod connecting the right group and a third rod connecting the two groups. The lower diagram shows one of the two diverters that connect the two groups together. At the top is the connecting ring attached to the diverter panel which receives a connecting ring attached to the rod which connects one group to another. The rings at the bottom are for connecting the two groups together and also attach to an actuator which is not shown.

    Figure 6 shows a simpler second embodiment which only requires one rod to tie all diverters and the actuator together.

    Figure 7 shows a third embodiment which has a horizontal diverter panel for each group and each panel connects to a separate actuator.

    A key part of this invention is to have the memory controller hub (MCH) calculate power, and therefore cooling load, for each group of DIMMS. The controller has intimate knowledge of all cycles sent to each group and a very accurate estimate of the power consumed for each cycle, therefo...