Chipkill


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Chipkill

A memory module technology from IBM that, similar to RAID 3 for hard disks, spreads the bits across multiple memory chips. It can take bad memory chips offline when too many bit errors are encountered and also correct errors of several bits per module. Chipkill typically exceeds the error correction in ECC memory. Although often referred to as Chipkill, similar technologies from other vendors are Single Device Disable Code (SDDC) from Intel, Extended ECC from Sun and Chipspare from HP. See ECC memory and RAID.
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All capacities support IBM's Chipkill technology, redundant spare memory chips with bit steering, memory scrubbing and thresholding to enhance data retention and overall system reliability.
The 16-bit Chipkill logic can correct 1, 2, 3, or 4-bit errors on the same DRAM and detect 1 to 8 bit errors contained in two DRAMs.