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Fatal1ty AB350 Gaming-ITX/ac no Gen3 PCIe for M.2

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: http://forum.asrock.com/forum_posts.asp?TID=12177
Printed Date: 04 Mar 2024 at 7:07am
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Topic: Fatal1ty AB350 Gaming-ITX/ac no Gen3 PCIe for M.2
Posted By: thomasryzen
Subject: Fatal1ty AB350 Gaming-ITX/ac no Gen3 PCIe for M.2
Date Posted: 12 Aug 2019 at 6:35pm
Hi,
so I just build my new PC with Fatal1ty AB350 Gaming-ITX/ac with AMD Ryzen 5 3400G and Plextor M9PeGN 256GB NVMe drive... have BIOS 5.70 on board.

When I test disk speed with CrystalDiskMark I get 822/822 MB/s not 3000/1000 MB/s as my M.2 drive can. In bios in Advanced -> AMD PBS -> PCIe x16 Switch I see only Auto, Gen1, Gen2 but no Gen3

Any ideas how to have PCIE3X4 on M.2 and not PCIE2X2 and have full M.2 speed?



Replies:
Posted By: thomasryzen
Date Posted: 12 Aug 2019 at 7:50pm
ok, updated bios to 6.0 see gen3 in M.2 settings... but still speed is 821/823 MB/s....


Posted By: thomasryzen
Date Posted: 13 Aug 2019 at 12:40am
can anyone help me, please?


Posted By: cx5
Date Posted: 13 Aug 2019 at 11:23am
@tomasryzen, I think we need a lot more info in order to reply/say something.

Your suffering is alarming and I'm sure many people would like to help.

Without knowing much I'm just simply guessing and asking
1) M9PeGN comes with heatsink or not? if not did you add one? may be heat throttle down?
2) your itx case? small and tiny not good air flow cause nvme throttle down ???
3) M.2 ultra socket on the back, no space, you were forced to remove heatsink???
4) uefi settings?


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x370taichi@3.50gen4
AX750 Optane900P SN770
3800x PosdonZro4 BarrowPWM-17w>420x140x28
XFX SWFT319 6900XT
MSI RX560 LP to get Fluid Motion BlueskyFRC 75hz


Posted By: gizmic
Date Posted: 13 Aug 2019 at 12:46pm
which cpu

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Posted By: thomasryzen
Date Posted: 13 Aug 2019 at 10:19pm
Hi, CPU is in first post.

@cx5
1. M9PeGN is without heatsink, did check temperature and is 46 celcius
2. no case (didn't have tim to put pc in case) air flow is amazing :) he is in open space and distance from desk is 5 cm
3. Again to heatsink, yes it's on back but it have airflow and tem is 46
4. in uefi drive is set to M.2 NVMe and M.2 is set to Gen3



Posted By: Ray62
Date Posted: 14 Aug 2019 at 5:04am
From my point of view it's not clear in which PCIe mode the SSD is running.
Did you check with a tool how the PCIE_M slot is used?
HWInfo -> Motherboard->Systemslots shows the Slot data bus width.

Is it Gen3 x2 mode, it behaves like with an old A-Series APU (Bristol Ridge).
With a Ryzen 5 3400G APU it should be Gen3 x4.
However, i think, this is a bios issue (if the drive is connected correctly).

I would contact Asrock support.

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Asrock Fatal1ty X370 Professional Gaming Offline
Under test:
MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE



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