What Mac Pro's support 6 gb/s hd speeds

Discussion in 'Mac Pro' started by SmilesLots, Jul 24, 2011.

  1. SmilesLots macrumors regular

    SmilesLots

    Joined:
    Apr 30, 2010
    Location:
    SW Virginia
    #1
    What Mac Pro's if any currently support 6 gb/s hard drive speeds? TIA
     
  2. blunti macrumors 6502a

    Joined:
    Mar 15, 2011
    #2
    by default? none. there are a few topics about 3rd party add-on cards though. might wanna check those out...


    Sent from my iPhone using Tapatalk
     
  3. Dnix macrumors 6502

    Joined:
    Dec 9, 2010
  4. derbothaus macrumors 601

    derbothaus

    Joined:
    Jul 17, 2010
    #4
    PCI these day's runs from 2Gb/s to 128Gb/s. So yes if drivers are up to snuff and you slot it correctly there is no problem getting 6Gb/s.
     
  5. FireWire2 macrumors 6502

    FireWire2

    Joined:
    Oct 12, 2008
    #6
    Technically, there is.

    Most of the 2x ports SATA 6Gb/s has a design flaw, it has 2x 6Gb ports but connected to 1x lane PCI e V2 (5Gb/s)

    It's bandwidth not even 1/2 of what it supports.

    It's strange!
     
  6. derbothaus macrumors 601

    derbothaus

    Joined:
    Jul 17, 2010
    #7
    Good point. Watch what you buy. I have never looked for an expansion card in these "modern" times. I think some of the 4x cards go by the name "True SATA 6Gb/s" or "True SATA 3".
     
  7. nanofrog, Jul 26, 2011
    Last edited: Jul 26, 2011

    nanofrog macrumors G4

    Joined:
    May 6, 2008
    #8
    It's a design compromise to keep it cheap as well as minimize the lane usage (i.e. no 2x lane configurations).

    So it's either 1x or 4x lanes depending on the requirement; inexpensive vs. performance (that can't utilize all of the bandwidth assigned to it for 2x ports). Most of the 4x lane versions however are 4x port, and there's still a performance limit for simultaneous usage and disks that can exceed the band limitations.

    They've waited for PCIe 3.0 to "fix" the issue (1GB/s per lane), and even then, 2x ports running simultaneously still get throttled if the disks can actually exceed 500MB/s for sustained throughputs (still 2x ports on 1x lane SATA controllers). Not a big change on the surface, but if a single disk is run, at least they can operate at full band for SATA III (get the additional 40 - 50MB/s out of the disk).
     
  8. xgman macrumors 601

    xgman

    Joined:
    Aug 6, 2007
    #9
    Note that "boot" support for the sata 3 cards is kind of dicey right now.
     

Share This Page