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For DDR4: One DRAM manufacturer, Micron, indicated that they are putting rowhammer mitigations into some of their DDR4 DRAM (see this data sheet). Other manufacturers might be doing the same. Note that it is not necessarily true that "DDR4 is OK". There's nothing in the DDR4 standard that makes DDR4 memory safer than DDR3 memory -- the DDR4 standard does ...


Basically most DRAM (dynamic-Random-Access-Memory) modules are vulnerable to rowhammer. If you want to be secure from the possibility of switching bits (after hourlong 'hammering', ofc), all SRAM (static-Random-Access-Memory) modules will do. SRAM is mostly used in Servers, it is more expensive but more stable (and in this case secure) against flipping ...

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