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Thread: slow ssd's




  1. #11
    parsec's Avatar
    parsec is offline Senior Member
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    Default Re: slow ssd's

    That is certainly NOT the difference between SATA II and SATA III! No SATA III SSD in existence can do over 8GB/s read speed, except...

    ... when a Samsung EVO has RAPID mode enabled in the Samsung Magician software. What we are really seeing is the RAM caching that RAPID creates, which is similar to a RAM drive created by software out of the PC RAM memory.

    So all the read speed results are strictly those of the PC's RAM memory, which certainly can do 8GB/s read speed. For some reason, Anvil is not affected as much by the Samsung RAM cache in the write tests than it is in the read tests. We can see some affect of RAPID in the write tests, but not as much as in the read tests.

    Prof Jim's Anvil test was done without RAPID enabled, so we see the true results of his SSD connected to a SATA II interface. The OP's Anvil test with RAPID enabled, is 95% that of his PC's RAM memory, and in no way indicates the actual performance of an EVO.

    I'm not saying the Samsung EVO is a bad SSD, in a couple performance aspects without RAPID, it is the best of any current SSD. But once RAPID mode is enabled, we are no longer comparing SSDs, we are comparing a RAM drive to SSDs, which are two very different things.

  2. #12
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    Default Re: slow ssd's

    You where right about rapid mode being enabled. I wonderedslow ssd's-samsung-ssd-840-evo-250g-scsi-disk-device_250gb_1gb-20150307-0304-png why I got those readings. Disabled it an ran again. So this shouled be the true speed. RIGHT
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  3. #13
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    Default Re: slow ssd's

    Yes, that is the true performance of your 840 EVO, which is great.

    A few other things that can affect SSD benchmark and real world performance are the use of CPU power saving options, like SpeedStep and C States.

    If you have the IRST driver package installed on a Z87 or Z97 board, there is a new feature from Intel called Dynamic Storage Accelerator. There is an option in the BIOS, Storage Configuration screen, to enable this option. You then can configure DSA in the IRST Windows UI, which is by default set to the performance setting.

    RAPID can be useful, if you understand how it works. The first time you open/read a file from the EVO, it is read from the SSD of course, and also put into the RAM cache. If you open that same file again without the PC having been rebooted, it will be read super fast from the RAM cache.

  4. #14
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    Default Re: slow ssd's

    Well i have a Samsung xp941 coming Monday so might need help with that to want to thank everyone on tweaktown for the help
    Rich
    Motherboard Name ASRock extream6
    Inteli7-4790k @4.5ghz
    16gig Corsair Vengeance CMZ8GX3M2A1600C9
    SAPPHIRE TRI-X OC 100362-2SR Radeon R9 290

    Mouse logitech G602
    windows 7 ultimate
    lg blue ray burner
    Os smsung xp941 256gb
    storage 2 1tb drives 2 500 gig drives
    evga 1300 watt gold
    in win GRone Gray 0.8mm atx full tower case
    cpu heatsink corsair hydro h50
    Logitech THX Z-5300 surround sound system
    LG 27inch monitor

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