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Ultra M.2 PCIe Gen 3 side effects?

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Dirtydeedz View Drop Down
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    Posted: 31 Oct 2015 at 2:28am
Question:
1. Would a single Graphics card x16 become reduced to X8 using 1 or 2 of these Ultra M.2 Slots(x4)?
2. If running in x8 PCIe would the GPU take a performance hit? Currently, I'm using a 780 on a PCIe 2.0 x 16 slot which is the same thing.

I'm looking real hard at the Asrock Extreme 7+ which offers 3 X Ultra M.2(PCIe x4) slots.


Triple Ultra M.2 32 Gb/s (PCIe Gen3 x4 & SATA3)

The PCIe Gen3 x4 Ultra M.2 interface pushes data transfer speeds up to 32Gb/s. In addition, it also supports SATA3 6Gb/s M.2 modules, and is compatible with ASRock's U.2 Kit for installing some of the world's fastest U.2 PCIe Gen3 x4 SSDs.

The Secret of Ultra M.2

Ultra M.2 is one of ASRock creative innovations. Compared to normal M.2 with PCIe Gen2 x2 bandwidth, ASRock is the first one in the world to double the M.2 bandwidth to PCIe Gen3 x4! Furthermore, the layout of Ultra M.2 is also specially designed. On a regular motherboard design, the signal route starts from the M.2 device, goes through the onboard chipset, and finally reaches CPU. In contrast, by connecting the M.2 interface to CPU directly, ASRock Ultra M.2 has lower latency and pushes the I/O speed to a new level.



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Dirtydeedz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dirtydeedz Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2015 at 2:47am
From this article, it would appear that even if the GPU(NVidia) is running at X8 it doesn't matter.
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Joe America View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe America Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2015 at 10:33pm
if you are using the motherboard m.2 slot, usually PCIe slot 5 is disabled ( the last slot ).
it depends on the board, it works that way for the extreme4/3.1 I have.
the other slots can still run at 16x.

you can purchase PCIe v3 cards and use up one of your PCE v3 slots for two m.2 cards but they don't support any kind of motherboard raid of them, you just have two really fast drives.

not all boards support booting from the M.2 , the extreme4/3.1 does not support it as of today while the extreme4 does... go figure.




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Post Options Post Options   Thanks (0) Thanks(0)   Quote parsec Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2015 at 1:17am
Originally posted by Dirtydeedz Dirtydeedz wrote:

Question:
1. Would a single Graphics card x16 become reduced to X8 using 1 or 2 of these Ultra M.2 Slots(x4)?
2. If running in x8 PCIe would the GPU take a performance hit? Currently, I'm using a 780 on a PCIe 2.0 x 16 slot which is the same thing.

I'm looking real hard at the Asrock Extreme 7+ which offers 3 X Ultra M.2(PCIe x4) slots.


Z170 chipset boards, like the ASRock Z170 Extreme7+, are different in the way they allocate resources to the Ultra M.2 slots, compared to previous boards using the Z97 chipset that have an Ultra M.2 slot.

Intel improved the Z170 chipset to include PCIe 3.0 lanes. All recent earlier Intel chipsets used PCIe 2.0 lanes. Intel calls the Z170 chipset interface DMI3, which again is based on PCIe 3.0.

With the new Z170 chipset DMI3 interface, the 16 PCIe 3.0 lanes in the CPU are no longer shared between the PCIe 3.0 x16 slots and the Ultra M.2 slots. The Z170 chipset's DMI3 interface is used for the Ultra M.2 slots.

A video card used in a Z170 board will have all of the 16 PCIe 3.0 lanes from the CPU available, and will run at PCIe 3.0 x16 when one or more of the Ultra M.2 slots are in use. ASRock Z170 boards do not use any of the CPU's PCIe 3.0 lanes for the Ultra M.2 slots.

The only tradeoff with this configuration is the DMI3 resources in the Z170 chipset are shared between the Ultra M.2 slots and the SATA III ports. When one of the Ultra M.2 slots is in use, two of the SATA III ports will no longer be available.


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