ATA vs SCSI

Discussion in 'Macintosh Computers' started by buzzfgo, Oct 8, 2004.

  1. macrumors member

    buzzfgo

    Joined:
    Sep 9, 2004
    Location:
    Up State NY
    #1
    I just found out that my G4 has a SCSI card in it. Would I see any gains in speed with a SCSI hard drive vs an ATA one?
     
  2. macrumors 65816

    tomf87

    Joined:
    Sep 10, 2003
    #2
    Even though SCSI is a more efficient bus, you most likely won't notice any performance gains with one or two drives. You may actually lose performance if the SCSI card is really old (SCSI-1 or SCSI-2).
     
  3. Moderator emeritus

    edesignuk

    Joined:
    Mar 25, 2002
    Location:
    London, England
    #3
    Depends if you can put a 15k U320 SCSI drive on it :D
     
  4. macrumors 65816

    tomf87

    Joined:
    Sep 10, 2003
    #4
    Still one drive won't be that much faster at transferring data. Even though the spindle speed is faster, the MB/sec doesn't increase that much with one drive. To get higher performance you need to use multiple spindles together.

    Then if you connect it to a SCSI-1 or SCSI-2 card, you are operating at those slower speeds.
     
  5. Moderator emeritus

    Joined:
    Jun 25, 2002
    Location:
    Gone but not forgotten.
    #5
    Well, since so much of an ATA drive's speed depends on the main processor, a slower machine may benefit from even an UltraSCSI card, since it doesn't require the main processor to be involved as much.
     
  6. macrumors 65816

    tomf87

    Joined:
    Sep 10, 2003
    #6
    Not sure what you mean there. The controllers for IDE/ATA drives are built on the devices. There really is no controller on the mainboard. That's why they are termed host bus adapters.

    Anyway, the SCSI card will plug into a PCI slot anyway, which is CPU controlled, so you're still hitting the CPU with something.
     

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