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  1. #1
    ROG Junior Member Array
    Join Date
    Mar 2018

    Question is RAMCache II can retain information/preference after turning off the pc ?

    Hi guys, is there anyone can help me. I am a bit curious about RAMCache II.

    is RAMCache II have a capability of retaining information after turning off the pc ?
    I do some research that the normal cache of RAM is automatically erased after turning off the pc.

  2. #2
    ROG Guru: Black Belt Array Korth PC Specs
    Korth PC Specs
    MotherboardASUS X99 R5E (BIOS2101/1902)
    ProcessorHaswell-EP E5-1680-3 SR20H/R2 (4.4GHz)
    Memory (part number)Vengeance LPX 4x8GB SS DDR4-3000 (CMK32GX4M4C3000C15)
    Graphics Card #1NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Graphics Card #2NVIDIA Quadro GP100GL/16GB, 16xPCIe3, NVLink1 (SLI-HB)
    Sound CardJDS Labs O2+ODAC (RevB), USB2 UAC1
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    Storage #1Samsung 850 PRO 512GB SSDs, 4xSATA3 RAID0
    Storage #2Comay BladeDrive E28 3200GB SSD, 8xPCIe2
    CPU CoolerRaijintek NEMESIS/TISIS, AS5, 2xNH-A14
    CaseObsidian 750D (original), 6xNH-A14
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    Korth's Avatar
    Join Date
    Mar 2015

    Volatile memory - like DDR4 RAM - requires constant power to hold data, the data is corrupted or lost once power is removed. There are forensic methods of recovering data from unpowered RAM, they usually involve quick action and extreme subzero temperatures and laser-etching the packaging down to expose the silicon and optically extract/reconstruct the stored information - the sort of stuff you'd expect some MIB/NSA/CIA agency might be able to pull off. There are no software methods which can recover the contents of RAM after power is shut off. In fact, most computers electrically "erase" the RAM contents during POST every time they reboot.

    Nonvolatile memory - like SSD storage and NVDIMMs - only requires power when (re)writing data, they can hold data indefinitely without power.

    If RAMCache operates entirely within volatile RAM then it can't retain any cached information after power loss. And there's no point in running RAMCache with nonvolatile memory types because it would offer no performance benefit.

    Some SSD brands offer caching software - like Samsung's RAPID Magician - which can cache SSD data in (volatile) RAM. Some of these can be configured to permit Read Caching and/or Write Caching independently - enabling both offers best performance gains but enabling Write Caching risks data loss if the cache cannot be written before sudden power loss.

    Some physical RAM disk devices still exist which actually run a virtual disk in volatile RAM DIMMs. Most of these feature some sort of battery or NVflash backup system to prevent data loss during sudden power loss events, but these backups can be deliberately disabled if "destroying" data (for paranoia/security reasons) is important.
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