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Z370 Taichi PCIe
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puma99dk| View Drop Down
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    Posted: 08 Sep 2018 at 9:10pm
The CPU it self has 16 PCI-E lanes wired to the graphics that why if you use the 2x16 slots they will run at 2x8 PCI-E.

The Z370 chipset have 24 PCI-E lanes, I have the same board and I use a i7-8086K it does have 16 PCI-E Lanes to directly for Grapchis and I use a Samsung 960 EVO 250GB M.2. and my GTX 1080 Ti on this board with bios P3.10 runs x16 3.0 without any issues and under no load it runs x16 1.1.
CPU: Intel Core i7-8086K
MOBO: AsRock Z370 Taichi
GFX: Nvidia GeForce GTX 1080 Ti Hybrid
OS/Win10 Pro: Samsung SSD 960 EVO 250GB
Storage: WDC Gold 1TB, RED 2x4TB, Purple 1x4GB
PSU: Corsair SF600
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Animalm4st3r View Drop Down
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Just dug out this old thread if someone else comes along with the same issue. Wardog was right.
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Animalm4st3r View Drop Down
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Well Pulled the GPU and M.2 Cleared CMOS. Installed GPU.
Still only 8x. Right now i have no second system around for further crosstesting
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2018 at 3:34am
Originally posted by Animalm4st3r Animalm4st3r wrote:

Was just curious because it was nowhere mentioned in the manual that this m.2 is using up lanes from the GPU


The M2 doesn't "use' lanes from the GPU, that I can tell.

Your CPU provides 16 lanes. What with 4 being used up via the M2 installed, that leave 12 free. Unfortunately there is no Spec for PCIe x12, so 8 it is .
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2018 at 3:31am
Originally posted by Animalm4st3r Animalm4st3r wrote:

well i just tried pulling the m.2 it stays at 8x


Just pulled it? Or did you remember to reset the BIOS after also?

I'm not pushing you, k? Just trying to help.
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Animalm4st3r View Drop Down
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well i just tried pulling the m.2 it stays at 8x

I think i will just live with it as it is not a big deal and everything is running smooth and stable

Was just curious because it was nowhere mentioned in the manual that this m.2 is using up lanes from the GPU


Edited by Animalm4st3r - 05 Feb 2018 at 3:08am
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2018 at 12:00am
Originally posted by wardog wardog wrote:

But it's not a compatibility issue. It's a math issue.

Your 8600K has 16 lanes. 4 are used with the M2 drive and 8 are used/left for the RX480.


If you want to tinker, pull the M2 drive and in its place do a cheap install of Windows. My guess is by freeing up those 4 M2 lanes your RX480 will be running x16.
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 04 Feb 2018 at 11:57pm
But it's not a compatibility issue. It's a math issue.

Your 8600K has 16 lanes. 4 are used with the M2 drive and 8 are used/left for the RX480.
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Animalm4st3r View Drop Down
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Points: 226 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Animalm4st3r Quote  Post ReplyReply Direct Link To This Post Posted: 04 Feb 2018 at 6:48pm
well then i will just live with that because its just a loss of 1% power overall.
It maybe some sort of compatibility issue becaue when i first installed windows i almost had to force feed the driver into windows over some shady tricks because the PC always crashed during a normal driver install..
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 04 Feb 2018 at 2:38pm
M.2_3 is only shared with SATA3_3
https://www.asrock.com/MB/Intel/Z370%20Taichi/index.asp#Specification
If M2_3 is occupied by a SATA-type M.2 device, SATA3_3 will be disabled.


This doesn't bode well for you!
https://ark.intel.com/products/126685/Intel-Core-i5-8600K-Processor-9M-Cache-up-to-4_30-GHz
Max # of PCI Express Lanes - 16
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