AMD Motherboards - B450 chipset PCIE lane availability for GPU + M.2

Print Page | Close Window

B450 chipset PCIE lane availability for GPU + M.2

Printed From: ASRock.com
Category: Media&User's Review
Forum Name: AMD Motherboards
Forum Description: ASRock AMD Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=21115
Printed Date: 26 Dec 2024 at 8:18pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B450 chipset PCIE lane availability for GPU + M.2

Posted By: abhishekkalyani
Subject: B450 chipset PCIE lane availability for GPU + M.2
Date Posted: 16 Jan 2022 at 11:39pm

Hi,

I am planning to build my system with Ryzen 5 3600 in a B450 mobo(My choice are ASRock B450M Pro4 or MSI B450M Pro-VDH Max)

Now I am also using a GTX 1050 TI GPU with it. So if I Install a M.2 NVME SSD, as far as I know that B450 mobo dont have its own PCIE 3.0 x4 lanes for M.2 slot. So it uses CPU's lanes for the same. So now, if I install it, will my GPU will run at x8 lanes? or My GPU will continue to to run at x16? But can it be possible, will the B450 be able to use 4 lanes from my CPU's(3000 series ryzen) total 20!

Replies:

Posted By: Xaltar
Date Posted: 17 Jan 2022 at 12:02am

Slots
AMD Ryzen series CPUs (Vermeer, Matisse, Cezanne, Renoir, Summit Ridge and Pinnacle Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD Ryzen series CPUs (Picasso, Raven Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD Athlon series CPUs
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x4 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)

- 1 x PCI Express 2.0 x1 Slot
- Supports AMD Quad CrossFireX??and CrossFireX??

*Supports NVMe SSD as boot disks
Storage
- 4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0, RAID 1 and RAID 10), NCQ, AHCI and Hot Plug*
- 1 x Ultra M.2 Socket (M2_1), supports M Key type 2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32 Gb/s) (with Vermeer, Matisse, Cezanne, Renoir, Picasso, Summit Ridge, Raven Ridge and Pinnacle Ridge) or Gen3 x2 (16 Gb/s) (with Athlon series APU)**
- 1 x M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280 M.2 SATA3 6.0 Gb/s module

*M2_2 and SATA3_3 share lanes. If either one of them is in use, the other one will be disabled.

**Supports NVMe SSD as boot disks
Supports ASRock U.2 Kit

With the 3600 you will be running at x16. Not that it matters at all with a
1050Ti anyway. The number of lanes multiplied by the throughput of the PCIe
generation determine the maximum bandwidth between the CPU and GPU. Even higher
end GPUs (like the RTX 2080) struggle to saturate the full PCIe 3.0 x16 bandwidth. My point is, x8 is more than enough bandwidth for 90% of GPUs and
x16 will not provide any measurable performance increase in most cases.

-------------

Posted By: abhishekkalyani
Date Posted: 17 Jan 2022 at 3:02pm

Yes GTX 1050 TI will never use full capacity of 16 lanes. But my question is whatever the GPU is, will it be able to use all 16 lanes on B450 mobo with M.2 NvME SSD in it?

Posted By: Xaltar
Date Posted: 18 Jan 2022 at 1:17am

I already answered that

With the 3600 you will be running at x16

-------------