Chipkill support
Chipkill is a form of advanced Error Checking and Correcting (ECC) computer memory technology. The
HP xw9400 Workstation supports 128-bit Chipkill ECC memory functionality. Standard ECC functionality
detects and corrects single bit data errors in memory systems. But Chipkill offers greater memory error
protection by providing error correction for up to 4-bit errors within the same symbol (nibble boundary).
Chipkill cannot correct any random four bits across 128 bits.
Chipkill on the xw9400 functions within these parameters:
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The workstation enables Chipkill functionality on paired ECC memory DIMMs only.
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The use of single memory DIMM—not supported on the xw9400 workstation—allows standard
single bit ECC only.
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Chipkill can detect and correct up to four bit errors if the four bits are in the same symbol. That is,
multiple bit errors in bits 0–3 or 4–7 of a byte can be detected and corrected. Multi-bit error that
overlap or span symbol boundaries (bits 2–5 or 3–6, for example) cannot be corrected. For DIMMs
that are based on x4 parts, this means that a single DRAM chip can fail and the system will continue
to operate. For x8 and x16 parts, a complete DRAM chip cannot fail, but symbol errors will be
corrected as described.
12 Chapter 1 Product overview ENWW
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