iMac19,1 fusion drive SSD blade sizes

Discussion in 'iMac' started by KonaBlend, Mar 29, 2019.

  1. KonaBlend macrumors member

    Oct 18, 2008
    can anyone confirm SSD blade sizes for 1TB and 2TB fusion drive options?

    on a related note, does the SSD blade use the same (apple proprietary?) connects to the motherboard as the non-fusion SSD configuration? and curious, is this connector basically M.2 with PCI express? version 3? how many lanes? so many questions i know...
  2. vertical smile macrumors 68040

    vertical smile

    Sep 23, 2014
    The current 2019 iMac's 1TB Fusion Drive has a tiny 32GB SSD. The 2TB and up has 128GB SSD.
  3. Zdigital2015 macrumors 65816

    Jul 14, 2015
    East Coast, United States
    32GB for the 1TB and 128GB for the 2TB and 3TB.

    PCIe version 3.0 x4 lanes 8GT/s. Proprietary connector 12+16 pins.

    See this blog post for more info -
  4. naerct macrumors member


    Mar 19, 2019
    Southern NH
    Yes, NVMe is a PCI device. Most blades need X4 PCI slots for full speed. In my old 2009 MacPro, a single NVMe blade in a X4 slot only gets me 1.5GB/s reads, since the MOBO is PCI 2.0. That speed nearly doubles in the PCI 3.0 MOBO which most Macs now use. However, I use a IO Crest X16 PCI card/switch ($200) which goes in a X16 slot and essentially gives you two blades on one PCI slot and full PCI 3.0 speeds. It also has a recommended heat sink and fan built into the card/enclosure. Samsung 1TB 970 EVO=2.7GB/s reads and 2.4GB/s writes.

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3 March 29, 2019