Sunday, 19 June 2016 14:13

Slow Samsung Evo 850 SSD

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These are my reseach notes for trying to find out why my new Samsung Evo 850 SSD was not running at advertised speeds in my Dell E6540 Laptop.

Settings I tried and the results:

  • Chipset drivers set as IRRT but running in ACHI mode in bios (No Change)
  • using a standard ahci drive from microsoft 2006 causing issues (No Change)
  • use intel RST technology but make sure this is the driver being used (No Change)
  • c state setting in bios (No Change)
  • Disable the samsung RAPID Mode  as it is only a RAM disk
  • Intel speed step disabled (a bit better)
  • Single core rather than multi (slower IOPS read if i restrict to 1 core because not proper 1 CPU emulation, 1 core giving half speed and thus maxing the core out.)
  • UEFI / Legacy MBR (No Change)

Other Settings Not tried or are not applicable:

  • I can bump those 4K random read/writes up by disabling C1e and c-states in my BIOS
  • Other power settings in bios

So the Specific Settings I have available in my Dell E6540 are:

  • System Status
    • SATA Operation = AHCI
  • Performance
    • Multi Core Support
    • Intel SpeedStep
    • C-States Control
    • Intial Turboboost

None of these made any difference.

Other things to try that have been suggested:

  • Try safe mode
  • Try running prime 59 whilst running the Performance program because the CPU is kicked in fully
  • Window has power management features that could throttle the CPU
  • See if the drive is faulty by trying it in a Desktop PC with a powerful SATA chipset.


It is my chipset that has a limitation. Not all laptops were designed to handle SSD speeds because when these laptops were getting designed, SSDs were not main stream yet.


Read 1127 times Last modified on Sunday, 19 June 2016 14:28