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Aqua PCIe Lanes: CPU vs PCH Distribution
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rangulicon View Drop Down
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Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rangulicon Quote  Post ReplyReply Direct Link To This Post Topic: Aqua PCIe Lanes: CPU vs PCH Distribution
    Posted: 28 Nov 2019 at 1:04pm
Can anyone help in providing a full breakdown of how PCIe lanes for CPU and PCH are distributed among all slots and devices on the Aqua motherboard?

It'd also be great to know how populating certain slots affects available lanes for other devices.

The motherboard manual is not very helpful at describing any of this in detail for anything but the main PCIe slots.

If we can compile this information here it will help other Aqua motherboard owners in the future.
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Ray62 View Drop Down
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Points: 706 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Ray62 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov 2019 at 6:29am
First, the X570 Aqua and the X570 Creator are the same (without regarding the cooling).

As in nearly all X570 boards:
CPU:
PCIE1 PCIe 4.0 x16 with 16 lanes (8 lanes, if PCIE4 is used too)
PCIE4 PCIe 4.0 x16 with 8 lanes
First M2 slot with PCIe 4.0 4x

PCH:
PCIE6 PCIe 4.0 x16 with 4 lanes
Second M2 slot with PCIe 4.0 4x
4 SATA ports


Aqua/Creator specific:

* Via PCH->PCIe 2.0 Controller->HUB, the following connections share bandwidth via one PCIe 2.0 lane:
PCIE2 PCIe 2.0 x1
PCIE3 PCIe 2.0 x1
PCIE5 PCIe 2.0 x1
4 SATA ports

All the other devices (USB, WiFi, NET, Audio) not regarded here.

* This info is from here:
https://www.tomshardware.com/reviews/asrock-x570-creator-motherboard
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Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rangulicon Quote  Post ReplyReply Direct Link To This Post Posted: 30 Nov 2019 at 4:19am
Thank you for the info @Ray62.

I've seen people report that other X570 based boards split multiple M.2 slots between CPU and PCH based lanes.

It great to have confirmation that for the Creator and Aqua both M.2 slots are on the CPU based PCIe Lanes.
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Originally posted by rangulicon rangulicon wrote:

Thank you for the info @Ray62.

I've seen people report that other X570 based boards split multiple M.2 slots between CPU and PCH based lanes.

It great to have confirmation that for the Creator and Aqua both M.2 slots are on the CPU based PCIe Lanes.

What confirmation???

PCH:
PCIE6 PCIe 4.0 x16 with 4 lanes
Second M2 slot with PCIe 4.0 4x
4 SATA ports
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Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rangulicon Quote  Post ReplyReply Direct Link To This Post Posted: 30 Nov 2019 at 7:43am
Apologies I misread what you wrote. So all x570 boards split the M.2 between CPU and PCH. Good to know.
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Here is a Block Diagram I find gives the most info regarding how connections are distributed between the chipset and CPU PCIe lanes.
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Ray62 View Drop Down
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Points: 706 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray62 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Dec 2019 at 5:14am
It would be nice to see those diagrams in all Asrock (and other vendors) mainboard manuals.
I just wonder from which side this image (just an imgur link) is stolen...

And i got it: An new Aqua review @Anandtech:
https://www.anandtech.com/show/14951/the-asrock-x570-aqua-motherboard-review-

But sad like for all Aqua-Reviews, they also did not test it with a 3950X or at least with a 3900X for showing the real cooling muscles of this board. Isn't it allowed by Asrock?
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