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When performing the second pass, address pairs are hammered only at the rate deemed as the maximum allowable by memory vendors (200K accesses per 64ms). Once this rate is exceeded, the integrity of memory contents may no longer be guaranteed. If errors are detected in both passes, errors are reported as normal.

This warning appears when errors are detected during the first pass (maximum hammer rate) but no errors are detected during the second pass (lower hammer rate). See MemTest86 Test Algorithms for a description of the two passes that are performed during the Hammer Test (Test 13).

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  • Chrome will also send a signal to your default search engine when you focus in the omnibox, telling it to get ready to provide suggestions.
  • That signal includes the URL of the currently displayed search engine results page.
  • When in Incognito mode, in order to provide these suggestions, Chrome relies on an on-device model that does not communicate with your default search engine until you select a suggestion.

When MemTest86 detects errors during the memory tests, the memory address, actual and expected data are reported to the user. The memory address is the location in system memory where the data contained does not match what was expected. This is the address that is specified by the CPU to the memory controller when requesting data from DRAM.

One would need to do a major scientific study of 1000 of computers and their usage patterns, then do a forensic analysis of each application to study how it makes use of the RAM while it executes. To date, we have only seen 1-bit errors as a result of running the Hammer Test. Starting from MemTest86 v6.2, the user may see a warning indicating that the RAM may be vulnerable to high frequency row hammer bit flips.

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The memory controller then decodes this memory address to identify the specific channel, DIMM, rank, DRAM chip, bank, row and column in DRAM using a chipset-specific address decoding scheme. The errors detected during Test 13, albeit exposed only in extreme memory access cases, are most certainly real errors. During typical home PC usage (eg. web browsing, word processing, etc.), it is less likely that the memory usage pattern will fall into the extreme case that make it vulnerable to disturbance errors. It may be of greater concern if you were running highly sensitive equipment such as medical equipment, aircraft control systems, or bank database servers. It is impossible to predict with any accuracy if these errors will occur in real life applications.