Solved Is my GPU running on PCIe 4.0 or 3.0 ASUS ROG Strix B550-F Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Motherboard (PCIe 4.0

Actually, looks like your GPU can use up to 8 lanes



From here:

So then it should be running at PCIe 4.0? I think I do still have the integrated graphics at least I know, I didn't uninstall it. I'll check and see Thanks!

Removed the AMD Software but it still, shows PCI Express x8 Gen 3? It's got me baffled.

Scott said:

I think you have this right. Looking more closely at your board's manual it doesn't look like the first GPU slot and the first M.2 slot
share bandwidth with each other or anything else. It's the other four PCIe slots that share bandwidth with each other.

I don't understand why your GPU is running x8 Gen 3 as it should be running x16 Gen 4.


(snip)

Click to expand...

The RTX 4060 is PCI-E 4.0 X8. Not X16. NVIDIA GeForce RTX 4060 Specs

Apparently, PCI-E 3.0 is what you get from the 5700G. AMD Ryzen 7 5700G Specs I didn't know that.

Haven't downloaded it yet but I'm fixing to. I'll se what it has to say.

p5200 said:

Haven't downloaded it yet but I'm fixing to. I'll se what it has to say.

Click to expand...

Crossed messaging, sorry.

Your 5700G only supports PCI-E 3.0, not 4.0. AMD Ryzen 7 5700G Specs

If you do a Web search, the consensus is that the performance loss of a 4060 at PCI-E 3.0 will be negligible to small. Don't worry.

Ok, so that's the reason I guess. Thanks! Saved me a lot of wasted time looking at everything else!

Yeah I discovered the limitations of the 5700G on a micro build I was doing. I figured that out after using a PCIe 4.0 M.2 drive in an X570 motherboard but not getting PCIe 4.0 connections. 5700x works fine though but no graphics.

BamaInArk said:

Yeah I discovered the limitations of the 5700G on a micro build I was doing. I figured that out after using a PCIe 4.0 M.2 drive in an X570 motherboard but not getting PCIe 4.0 connections. 5700x works fine though but no graphics.

Click to expand...

If I remember correctly, my M.2 Drive also, showed up as 3.0 for the same reason I guess.

bobkn said:

Crossed messaging, sorry.

Your 5700G only supports PCI-E 3.0, not 4.0. AMD Ryzen 7 5700G Specs

If you do a Web search, the consensus is that the performance loss of a 4060 at PCI-E 3.0 will be negligible to small. Don't worry.

Click to expand...

Interesting. Perhaps this is why I failed to get my ROG CROSSHAIR VIII HERO to successfully produce RAID 0 in NVMe. I'm only using a Ryzen 7 3800X. I think someone here suggested that I'd be better off with a 5800X but for the time being it isn't a priority for me.

MBD: ASUS ROG Strix B550-F Gaming WiFi II
CPU: AMD Ryzen 5700X3D
GPU: ROG-STRIX-RTX3060TI-08G-V2-GAMING
SD1: ADATA XPG SX8200 Pro (2TB M.2 NVME SSD) (PCIe 3.0 x4)
SD2: Intel 660p (2TB M.2 NVME SSD) (PCIe 3.0 x4)

Notes:
The GPU is in upper PCIe slot PCIEX16_1
None of the other PCIe slots are being used

Bus interface:comparison
RTX 3060 Ti: PCIe 4.0 x16
RTX 4060: PCIe 4.0 x8

Should be able to do gen 4 NVMe too.

Scannerman said:

Should be able to do gen 4 NVMe too.

Click to expand...

yup, all 4 of my M.2 slots are gen 4.0.

This explains it further...Since the B550 Chipset only supports PCIe Gen 3 then to get Gen 4 you have to pick a CPU that supports it.

ASUS ROG STRIX B550-F GAMING
3rd Gen AMD Ryzen Processors
1 x PCIe 4.0 x16 SafeSlots (supports x16 mode)
AMD B550 Chipset
1 x PCIe 3.0 x16 slot (supports x4 mode)*
3 x PCIe 3.0 x1 slots
* Share bandwidth with PCIe3.0 x1_1, PCIe3.0 x1_2, PCIe3.0 x1_3

Click to expand...

The following lists which 5000 series CPUs do not support PCIe Gen 4.

Cezanne (5000 series, Zen 3 based)
Have the integrated GPU disabled
CPUs support 24 PCIe 3.0 lanes
Ryzen 3: 5100
Ryzen 5: 5500
Ryzen 7: 5700

Cezanne (5000 series with Radeon Graphics, Zen 3 based)
Includes integrated 5th generation GPU
CPUs support 24 PCIe 3.0 lanes
Ryzen 3: 5300G, 5300GE, 5305G, 5305GE
Ryzen 5: 5500GT, 5600G, 5600GE, 5600GT, 5605G, 5605GE
Ryzen 7: 5700G, 5700GE, 5705G, 5705GE

Click to expand...

List of AMD Ryzen processors

Summarizing the information in the ASUS ROG STRIX B550-F GAMING manual for the M.2 slots:

Total supports 2 x M.2 slots
3rd Gen AMD Ryzen Processors
* M.2_1 slot: supports PCIe 4.0 x4
AMD B550 Chipset
* M.2_2 slot: supports PCIe 3.0 x4

Click to expand...

This shows that only the 1st M.2 slot supports PCIe Gen 4. However, that assumes the CPU supports PCIe Gen 4 which the Ryzen 7 5700G does not.

I'll probably replace the processor with a Ryzen 7 5700X later on.

I wonder of this one supports PCIe 4 across all lanes.

Scannerman said:

I wonder of this one supports PCIe 4 across all lanes.

https://www.amazon.ca/AMD-RyzenTM-5800XT-16-Thread-Processor-dp-B0D6NNDQ92/dp/B0D6NNDQ92/ref=dp_ob_title_ce

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20 lanes, all PCI-E 4.0.

The build I'm putting together for the time being has 44 lanes but it's only PCIe gen 3.

Scannerman said:

The build I'm putting together for the time being has 44 lanes but it's only PCIe gen 3.

Click to expand...

The 20 lanes for the 5800XT were for the CPU only.

What CPU are you using? An old Xeon?

All modern consumer grade CPUs controll 24 PCIe lanes, server grade like Xeon, Threadripper, Epyc double or more.
Of those 24, 4 are dedicated to communication with Chipest and 16 to communication with 1 or 2 PCIe x16 slots/busses. First x16 slot has 16 of those lines but if 2 of those first two x16 slots are used PCIe lanes are divided between them in 8+8 lines.
That leaves other 4 PCIe lanes to be used by eventual PCIe x1/x4 or M.2 NVMe slots/busses.
PCIe x16 slot doesn't "share" PCIe lanes with M.2 NVMe slots, inserting NVMe SSD in M.2 slot is not going to "steal" any PCIe lanes from CPU or can gain any if none of x16 slots is not used, it simply has 4 lames allocated to it and if no NVMe SSD is used they are just "wasted".
Generation of those 16 lanes is determined by CPU and BIOS options.
Wiring/traces are same for all PCIe generations, it's only frequency/bandwidth that changes so they are all up and down compatible. Every PCIe generation doubles the bandwidth/speed of previous generation but uses it's bandwidth/speed of earlier one.

It's similar with Chipset controlled/provided PCIe lanes but that doesn't depend on CPU PCIe generation. It also generates and distributes them same way and can have different generation from CPU. Cheaper MB Chipsets usually have less and/or earlier generation lanes that those of top grade. Chipsets also control most of I/O operations like for instance SATA so if they have less PCIe lanes, they may share them with SATA ports so some of them may become unavailable if M.2 or PCIe U (usually x4 or x1) are used.