Samsung SSD 950 pro M2 ... PCIE or SATA slots? Which one is better?

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Pmcchiu

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May 21, 2016
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I just built a new system with intel 6700k + Asus z170 deluxe + corsair dominator 2x8GB
Now I am struggling to install Samsung SSD 950 pro in PCIE slot or M2 SATA slot.
What's the pros and cons? If I put SSD in PCIE, I could fully utilize all SATA slots for max number of hard drives? But any impact on my GTX970 display card as it is also plugged in PCIE 16x slots. Any difference in BIOS settings? Appreciate your help and support.
 
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PCIe is going to be faster as long as its at least on PCIE 3.0 x 4. You can plug your M2 into the 16, but it will only utilize 4 of the 16 so don't bother. This being the case, your M2 will utilize 8GB/s of bandwidth in the slot vs SATA3 at 6GB/s. As for the difference in speed between the 2 (2GB/s) you...
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an1m473dph33r

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Feb 3, 2014
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PCIe is going to be faster as long as its at least on PCIE 3.0 x 4. You can plug your M2 into the 16, but it will only utilize 4 of the 16 so don't bother. This being the case, your M2 will utilize 8GB/s of bandwidth in the slot vs SATA3 at 6GB/s. As for the difference in speed between the 2 (2GB/s) you may want to look at some real life tests as I cannot give a definitive answer on performance gains.

 
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TehPenguin

TehPenguin

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May 12, 2016
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Not trying to be picky,but in order to avoid confusion: SATA III has a throughput of 6Gb/s, as in six gigabits per second, not 6GB(or gigabytes), which results in a net 600MB/s.
PCIe offers a throughput of up to 32GB/s(gigabytes) at PCIe v4 x16

Hooking up your 950 Pro to a SATA slot will bottleneck it severely.

Your motherboard has a dedicated M.2 PCIe x4 slot, though.
 
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an1m473dph33r

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Feb 3, 2014
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Yes, but an M2 drive only utilizes 4 of the 16 lanes on PCIe, adding up to 8GB/s. Since such time as to having researched this further, I have discovered there is no way to plug an M2 drive into a SATA connection so my earlier remarks were pointless. M2 utilizes the SATA chipset, rendering some SATA ports unusable (number of ports depends on the mobo), but plugs into its own ports on the mobo. Utilizes PCIe bandwidth, but SATA chipset.
 
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an1m473dph33r

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Feb 3, 2014
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I understand that but this guy's whole post is predicated on the idea that you can plug a 950 SSD into SATA ports, which you cannot. These new M2 drives have their own ports on the motherboard.

 
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