Is SATA bandwidth Shared on the Motherboards?

Discussion in 'SSD and HDD storage' started by MegaFalloutFan, Jun 4, 2021.

  1. MegaFalloutFan

    MegaFalloutFan Maha Guru

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    Question,
    Any idea if chipset SATA ports share bandwidth?
    or each port can perform at its peak even if all saturated at same time, say connecting 6 SATA SSD's and running speed test at same time.
    Im talking specifically about Intel and to be more specific Z490 and H470

    Basically if i plan to get x6 1Tb SATA SSD's will i get their top speed or should i plan to buy an HBA card?
     
  2. Caesar

    Caesar Ancient Guru

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    YES. But how the cpu,OS.....handles the speed is another question
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    The HBA can "relieve" your CPU...
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    Each mobo has its own config such as ..... (must refer to motherboard manual)

    Note also:Some motherboards will even disable 2 SATA ports if you are using M.2 (i think port 5 and 6)

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    Untitled.png
     
    Last edited: Jun 4, 2021
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  3. cucaulay malkin

    cucaulay malkin Ancient Guru

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    I just checked,ran 3 different ssd benchmarks on three different sata ssd's I have in my system simultaneously.
    came out pretty much the same as when testing one at a time
    z490 aorus elite mobo
     
  4. Astyanax

    Astyanax Ancient Guru

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    Asmedia and Jmicron are the total capacity of the 1 or 2 lanes, and the controllers are usually 2 port each.
    Intel does not share bandwidth (total throughput only limited by the DMI/PCI link between PCH and CPU), you can hit max drive throughput for DMA transfers on all ports at once.

    AMD sata, who knows.
     

  5. MegaFalloutFan

    MegaFalloutFan Maha Guru

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    Thanks thats good to know
     
  6. MegaFalloutFan

    MegaFalloutFan Maha Guru

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    Isn't DMI link is just PCIe Gen 3.0 x4, so it should be enough for 6 SATA SSD's
    Right now i have the SSDs connected to my 5950x that had no SATA ports [it has just 4 native and 2 usless trough ASSmedia gen 2.0 x1 link], so I had to use HBA card but i had no idea it doesn't pass-trough trim.
    So i want to free my gaming PC back to gaming and move the SSD work to Intel, i have z490 with 6 sata ports, enough for all the SSD, x2 m.2 for two NVMe, boot drive on x4 adapter card to m.2 and the HBA card for Hard drives.
     

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