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Thread: Unexplained Speed Difference 2 Similar SSDs - Connected Differently- GA-P55a-UD3 - MacOSX 10.8.2




  1. #1
    Join Date
    Nov 2010
    Location
    MD. USA
    Posts
    11

    Default Unexplained Speed Difference 2 Similar SSDs - Connected Differently- GA-P55a-UD3 - MacOSX 10.8.2

    I have 2 SSDs-Samsung 840-250GB and OCZ Vertex 3-250GB SSDs. Both have Trim support. Turbo Mode is disabled in BIOS.
    I use them for Mac OSX 10.8.2 Mountain Lion This is a Hackintosh-OSX on a PC. Same results with LION.
    The OCZ SSD is directly connected to one of the 2 GSATA ports on my GA-P55a-UD3-F11 Rev 2
    The Samsung 840 SSD is connected to Highpoint Rocket 620 PCIe 2.0 SATA III 6Gb/s controller card.
    The OCZ's disk throughput is about 2.5 times that of the Samsung SSD. I used Blackmagic to test. I confirmed the test using the drive test feature of Drive Genius.

    The GSATA port connection is 2.5 times faster than a connection through either controller card.
    Given the poor throughput usually associated with the GSATA ports on this motherboard, I think this throughput is opposite what's expected.
    I have also gathered throughput data with another [other than Highpoint] PCIe controller card- SY-PEX 40039-Asmedia 1061 SATA Host Controller
    Both PCIe controller cards are SATA 3 6Gbps.

    I have swapped the 2 SSDs between the GSATA connection and the 2 controller PCIe card connections.

    The throughput results are similar. The SSD connected to the GSATA port is 2.5 times faster than when connected to a PCIe card.

    I mentioned the Turbo Mode status after reading how Gigabyte supports PCIe using CPU connection in 1 case and chipset in another. Could that be part of problem?
    It's a problem with connecting to the motherboard using either of these cards.
    ANY IDEAS OF THE CAUSE & SOLUTIONS ?

    There are postings on the internet that show this strange finding does not happen with other motherboards-
    Folks get good throughput with both these cards.[Most of that data is from Windows 7].
    The controller cards were in the PCIex4 slot of the motherboard.
    The only other card in the PCIe or PCI slots is a MSI R5770 video card in x16 [I tried swapping the 5770 video card with the controller cards -did not fix problem.

    I have contacted the SSD vendors and the controller card vendors they have not been helpful.
    Ga-Z87X-UD5H, i7-4770K, built in video 16GB RAM, 2100 speed, Auria 27 inch monitor Hackintosh implementation of OSX 10.11 Sound used USB adapter[internal sound doesn't work! Ga-P55a-UD3 i5-560 8GB RAM, r 5770 video, Dell Ultra Monitor, BPN DE110SS Hard Drive Cage, SSD Samsung 840, 500Gb + HDD Windows 10 --P55a is connected to Comcast Router and to WiFi service from another provider[preferred]
    z87x is connected to Comcast router only --Canon pixma MX922 Canon Laser

  2. #2
    Join Date
    Aug 2009
    Location
    Birmingham,Great Britain
    Posts
    9,250

    Default Re: Unexplained Speed Difference 2 Similar SSDs - Connected Differently- GA-P55a-UD3 - MacOSX 10.8.2

    tried disabling usb3? I think that affects pci-e speeds on that board not sure
    Gigabyte z77x UP4-TH F11c Modded Bios
    Intel i7 3770k 24/7@4.8ghz 1.38v Turbo llc +0.165v dvid multithreading enabled
    Samsung Green(MV-3V4G3D/US) 8GB @2133mhz 9-10-10-21-1t 1.55v
    Thermalright Silver Arrow Cpu Cooler
    1xSamsung 840 pro 256 Gb SSD windows 8.1 pro 64bit
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    L.G E2260V L.E.D 1920x1080 Monitor
    Xfx Pro 750w silver rated Psu 80+
    Fractal Arc Midi Case

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