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Slow ssd speeds on raid 0 samsung 840pro with sabertooth 990fx r2.0 mobo

Hello all, been a lurker for a billion years and decided to write in finally. Just built a new computer and having installed windows 7 on 2 raid 0 Samsung 840 pro 256g drives it feels a bit underwhelming. My computer takes around 30 seconds for boot ( clocked after raid drivers load) and my brother's rig does it in half the time (He is not running raid). Also the windows updates take some time to install so I was worried my read/writes are way off so I took some tests with Magician and as-ssd.


I was trying to google a fix and it looks like people have an AMD SATA Controller in their device manager while I have old windows default one. I couldn't for the life of me update my drivers, it's difficult to find any 800/900 series drivers on AMD's site. I think that would speed up my bad write/reads. Samsung Magician could not detect my drives as Samsung.

Sorry if I posted badly, I never write in forums, I checked the stickies for any fixes and also checked the forums for my particular problem but couldn't find anything too relevant. Thank you so much in advance.

ASUS SABERTOOTH 990FX R2.0
G.SKILL Ripjaws X Series 16GB (2 x 8GB)
2x SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB SATA III
EVGA ACX Cooler 03G-P4-2784-KR GeForce GTX 780
CORSAIR TX Series CMPSU-750TX 750W
lian li PC-7BYCF Case
Windows 7 Home Premium sp1 64bit
10 answers Last reply Best Answer
More about slow ssd speeds raid samsung 840pro sabertooth 990fx mobo
  1. I can't read your images. Are your drives in IDE mode? I know of someone that had his SSD and other drives in IDE mode and the machine crawled.
  2. Karsten75 said:
    I can't read your images. Are your drives in IDE mode? I know of someone that had his SSD and other drives in IDE mode and the machine crawled.


    My drives are running in AHCI mode.
  3. How are your drives in AHCI mode and in raid0?
  4. Isn't AHCI just a subset of raid?
  5. Turn on RAPID mode?
  6. Best answer
    in your bios, check your sata port's mode. it should be raid.
    edit -I'm home now and can see your images. You are running the amd raid driver (ahcix64s) you are getting 939MB/s sequential transfer speeds which is near the top end for an AMD chipset. In fact all your speeds are really good from what I can see. You cant enable rapid mode on raids I dont think.
    You have AMD AHCI Compatible Raid controller listed under your storage controller which is also correct. Please rt click on it and on the driver tab, make sure the driver ends in .1540 ) which is the latest afaik.

    30s is also a fairly normal boot time. Raid actually slows that process down as is does most normal users tasks. Please have a read thru Toms analysis:
    http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485.html

    the only odd thing is the ide/atapi controllers. this might be the as media ports but I dont see that controller listed in the storage controller section (did you not load the drivers for it?) Or are they disabled and what we are seeing is leftover from when the OS was in ide mode?
  7. It does show 1540 as my driver. I saw my sequential read/write as fine, the random read and write seemed off. My brother has the same ssd and he was getting 66k read/write where as i'm getting 47/52k. But if you say that is normal, I guess I'll consider this answered.
  8. rerun youor as-ssd benchmark from safemode and post the screenshot plz.

    Different systems have different drivers, antivirus, windows configs (did you turn off superfetch & perform the other OS optimzations?) for example. Safemode will eliminate many of these differences.
  9. idrizmiftari said:
    Hello all, been a lurker for a billion years and decided to write in finally. Just built a new computer and having installed windows 7 on 2 raid 0 Samsung 840 pro 256g drives it feels a bit underwhelming. My computer takes around 30 seconds for boot ( clocked after raid drivers load) and my brother's rig does it in half the time (He is not running raid). Also the windows updates take some time to install so I was worried my read/writes are way off so I took some tests with Magician and as-ssd.


    I was trying to google a fix and it looks like people have an AMD SATA Controller in their device manager while I have old windows default one. I couldn't for the life of me update my drivers, it's difficult to find any 800/900 series drivers on AMD's site. I think that would speed up my bad write/reads. Samsung Magician could not detect my drives as Samsung.

    Sorry if I posted badly, I never write in forums, I checked the stickies for any fixes and also checked the forums for my particular problem but couldn't find anything too relevant. Thank you so much in advance.

    ASUS SABERTOOTH 990FX R2.0
    G.SKILL Ripjaws X Series 16GB (2 x 8GB)
    2x SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB SATA III
    EVGA ACX Cooler 03G-P4-2784-KR GeForce GTX 780
    CORSAIR TX Series CMPSU-750TX 750W
    lian li PC-7BYCF Case
    Windows 7 Home Premium sp1 64bit
  10. I have an AMD FX 6200 Six Core 3.80GHz
    16GB Ram Windows 7 Home 64bit and I've fitted a raid 0 with samsung SSD EVO840 120GB each.

    I record 49mb/s write speed. Its soooo bad. From 2x SSD
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