Specifications

62 Product Errata
25759 Rev. 3.79 July 2009
Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors
101 DRAM Scrubber May Cause Data Corruption When Using Node-
Interleaved Memory
Description
When enabled, DRAM scrubbing cleans ECC errors from memory by performing a read-modify-
write operation of each memory location at a programmable rate. In an MP system, if memory is
configured as Node interleaved, the DRAM scrubber may cause data corruption. If another write
request is made to the same address being accessed by the scrubber and occurs in a specific timing
window, then the write data could be overwritten by older data from the scrubber.
Potential Effect on System
Intermittent and non-repeatable data corruption may result from this erratum.
Suggested Workaround
Disable either DRAM scrubbing or Node interleaving. BIOS should disable DRAM scrubbing (i.e.,
clear Dev:3x58[4:0] - DramScrub) if the Node interleaved memory option is selected. DRAM
scrubbing and Node interleaving are setup options in the BIOS.
Note: The recommended BIOS default setting has been DRAM scrubber enabled and Node
interleaving disabled.
Fix Planned
Yes