Questions tagged [pci-express]

PCI-Express is a high-speed expansion bus which is developed to replace older buses such as PCI and AGP. The most common use of PCI-Express is the GPU installation on motherboards.

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Asus motherboard PCIe bifurcation & M.2 settings in PCIe x16 slots (from CPU)

Please help me understand the second table in the screenshot. This is from the Asus Pro WS W680-ACE IPMI user manual page 20. Can someone please explain what it means?
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How to disable GPU or PCIe bus power?

I have PC with dedicated (power hungry) GPU. I don't need it's power for most time and need to save power (sometimes I use this PC on UPS and GPU takes about 35W at idle) so I must physically remove ...
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About PCIe enumeration without IO map [duplicate]

I need a help to understand PCIe enumeration PCIe changes IO mapped IO to memory mapped IO. PCIe spec introduces Enhanced mechanism for Config read with MMIO. Since PCIe knows the memory address of ...
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GPU has two 8-pin PCIe sockets for power and my PSU has only one PCIe 6+2 connector. Is that one cable sufficient?

I'm building a PC and I've got an issue with the GPU (Sapphire Pulse 7800 XT 16gb graphics card) and the Deepcool DQ850-M-V3L 850 W modular power supply I'm using. The main problem is that the GPU has ...
The Alucard's user avatar
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How to get Intel i210at NIC ethernet card working on Linux

After my Ethernet port (on asus prime z370-p) mysteriously stopped working, I bought this PCIE ethernet card. I received this. Looks different than advertised, but probably equivalent? I am now ...
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dmesg: `PME: Spurious native interrupt!`

I am running Linux debian 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.76-1 (2024-02-01) x86_64 GNU/Linux (and dual-booting Windows 11, fast boot is turned off) and I see this line in my dmesg ...
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Why can't Intel CPU use AMD chipsets and vice versa?

In my own intrepretation, a chipset is just a hardware that implements PCIE, which is basically the communication protocol used by the CPU to communicate with device controllers. Now, PCIE is an open ...
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Is it possible to modfiy prefetchable memory for a PCI bridge?

The previous FPGA allowed for 0xFFFFF amount of memory. The newer FPGA has double the memory. The Linux pci driver is able to assign the correct memory space for each pci bus. [ 1.882289] pci 0000:...
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Is it possible to pass PCI express data signals via an express card USB 3.0 adapter?

I have a Magideal Dual Ports HUB PCI-E USB 3.0 Express Card Adapter that I use as a PCIe to USB 3.0 adapter. I want to connect an external GPU (as a PCI express device) via a USB 3.0 cable which only ...
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Trying to make sense of my PCIe slots

The following command gives me infos about my PCIe slots : # lspci -vv | grep -E 'PCI bridge|LnkCap:' 00:01.0 PCI bridge: Intel (...) PCIe Controller (x16) (...) LnkCap: Port #2, Speed 8GT/...
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What's the difference PCIe x16 (x4) vs x16

I'm a first time PC builder. I'm looking at mainboards. Some mainboards say they have a "PCIE 4.0 x16 (x4)" connection. I know what PCIE 4.0 x16 is but the (x4) confuses me. (Example ...
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NVMe VPD access failed

I get nvme 0000:01:00.0: VPD access failed. This is likely a firmware bug on this device. Contact the card vendor for a firmware update in my kernel log sometimes. However SMART data and NVMe self-...
Dmitry Sharshakov's user avatar
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Cloned SSD does not boot – a new twist

Looked at many posts but did not find a solution: I wanted to replace the original m.2 PCIe Kingston 500GB drive with m.2 WD 4TB SN850X (both are m.2 PCIe), with the Acer PC having one m.2 slot and ...
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GPU passthrough code 12 in win10 VM on proxmox

getting code 12 error in device manager. have tried 538 data center tesla, and 442 tesla desktop drivers. i cannot open nvidia control center, but on first try i get EULA prompt which i accept and ...
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Why does disabling active power management in BIOS double NVMe speed?

I bought a secondhand Dell OptiPlex 5060 Micro. It seems to be limited in speed to PCIe 2 (2 GB/s) despite clearly being PCIe 3. This is documented to happen on the 3070 OptiPlex micro here: https://...
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How to get Quadro RTX 6000 working in Dell EMC 8440 chassis?

I need to install and power the (circa 2018) Quadro RTX 6000 (QR6) GPUs in a Dell EMC 8440. The Dell 8440 uses the "Special 14 Pin to 8 Pin PCIe Cable" for GPUs, but because the QR6 is a ...
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SSD speed in different socket of CPU and chipset

If a motherboard chipset (like B760) has x4 DMI version 4.0 which has speed around 8GBps. And I use a M.2 NVMe PCIe 4.0 x4 SSD (speed around 8Gbps) in a socket which lanes are directly attached to cpu ...
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PCIe lanes distribution on in different interface

i5 12400f provide up to 20 lanes and compatible chipset like B760 have 14 lane whereas MSI Pro B760M-EDDR4 have 1x16, 1x4 interface. How these lanes are allocated chipset has only 14 lanes then how ...
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PCIe expansion cards for dual NVME M.2 drives

I have a MPG Z690 Carbon Motherboard. Here are the specs of the PCIe slots. PCI_E1 & PCI_E2 slots (From CPU) Support PCIe 5.0 Support x16/ x0, x8/ x8 Will two PCIe adapter cards for dual M.2 ...
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Using M.2 drives on a PCIe X16 adapter card

I purchased four M.2 NVME Gen 4 4Tb SSDs and a MPG Z690 Carbon WIFI motherboard. I want to do everything possible to produce the fastest read/write speeds from the individual drives. To be clear, I do ...
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Writing to PCIe registers at offsets > 0x1000

I'm on Ubuntu 22. I have a PCIe device (Intel H310 LPC), and I'd like to write to a particular configuration register (GEN_PMCON_A). According to the datasheet (p. 174), the GEN_PMCON_A register is at ...
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Alma Linux 9.x PLX SDK

The Broadcomm Linux PLX SDK 8.23 can be compiled and loaded on CentOS7, Alma Linux 8.8, openSUSE 15.5 or Ubuntu 20.04 computers essentially without problems (besides changing a mm->mmap_sem to mm-&...
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Usage of 8-pin connectors and 12VHPWR connector between PSU and RTX 3090 [pictures]

My PSU is 1000W Asus TUF Gaming Gold https://www.verkkokauppa.com/fi/product/867676/Asus-TUF-Gaming-1000W-ATX-virtalahde-1000-W My GPU is MSI Suprim X RTX 3090 which needs three (6+2pin PCI-E) ...
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TFTP breaks when I use ethernet PCI card but it succeeds when I use USB PCI with ethernet dongle

This question was closed on network exchange and I've been told to ask it here, so: I have a VM with an ethernet PCI card and a USB PCI card mapped on it. When I use ethernet PCI card to transfer file ...
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NL-SAS disk in desktop PCIe SAS controller. Does it work?

I have recently got the idea of deploying a home NAS, since I got a used SAS disk online. But now I realised it's a nearline SAS disk, and I preemptively bought a SAS controller for my desktop ...
Kazetta's user avatar
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NVME on PCIe on Gigabyte x570UD 1.0

I bought two NVME of 4TB each that I plugged on a PCIexpress extension card on my motherboard. Let me name the two newly bought NVMEs: NVME1 NVME2 (see below for more details) The problem I can ...
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How to correctly use 2 PSUs in a multi-GPU server

I am in the process of building a personal multi-gpu server for deep learning projects. Currently, I have 4x 4090 and 2x 1600W Superflower Titanium PSUs. The GPUs will be connected to the motherboard ...
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PCIE Finger Torn off Graphics Card

I have a 3080 ti FE that has been relegated to the bin due to mishandling during shipment. I will attach photos of all the visible damage, but I am mostly concerned with what I think is pin B65 being ...
BrokenPCIEFinger's user avatar
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1 answer
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Is it true that my 1650super runs on pcie 1.0 speed?

On hwinfo, I see this [Video Card] Video Card: MSI GTX 1650 SUPER Video Bus: PCIe v3.0 x16 (8.0 GT/s) @ x16 (2.5 GT/s) I was confused about the 2.5 GT/s in the end, so I asked ChatGPT. The line &...
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GPU PCIe lane usage

I have Asus TUF Gaming RTX 3060ti, Asus Prime Z490-V motherboard and i7-10700F CPU, GPU is installed on the top x16 slot on the motherboard. When checking nVidia panel in system information section, ...
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Is this normal/fine for a pci-e x16 slot?

I was in the middle of cleaning the dust build-up in my PC and when I took the gpu out carefully and got the gpu out. I noticed this https://imgur.com/a/4YTvikF This is the whole pci-e x16 slot area /...
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How does interrupt controller deals with PCI, QPI and other buses?

We know that communication between CPU and Notrh Bridge things happens through the PCIe or memory bus. Communication between CPU and South Bridge devices is made through the interconnect interface (...
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Will a mini pci-e sata card work on a laptop?

Recently I converted an old HP ProBook 4440s laptop that had no use for years into a mini nas for me. I was wondering how much can I do with this laptop so I wanna give it 16gb of ram and more storage ...
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What is this strange slightly-longer PCI slot?

This is a picture of the board out of a Dell Optiplex 980, the board's part number being D441T: link to image The board clearly has two PCIe x16 slots (though one is wired with just four lanes, ...
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Does CPU bottleneck and pci-e bandwidth matter when it comes to training and running keras/tf models?

I have an old Intel NUC (i7-6770HQ) with two m2 slots and connected a 2070 Super using one of these nvme to pcie adapters: they are also commonly used for bitcoin mining. I have observed that bench-...
user2741831's user avatar
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SD Card Reader going to sleep

My SD card reader on my new 12th gen Intel HP laptop goes to sleep after 12 or so seconds. Any action on it after that (that isn't cached) takes 3 seconds. My wife's computer has the same issue but ...
eric.frederich's user avatar
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1 answer
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FPGA PCIe EP to NVMe SSD in a Host environment

I have a FPGA data acquisition card that plugs into the PCIe slot in a typical high-end Windows/Linux workstation. I would like to transfer data coming into the FPGA to an NVMe drive plugged into ...
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PCIE NVME version 4.0 behaving like PCIE NVME version 1.0

I had a new HP Desktop for my son which came with 512GB of PCIE NVME SSD. Specs of HP Desktop 512 GB is too less - I replaced it with a old Dell XPS laptop(2018)-1 TB PCIE NVME(as that laptop was dead ...
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Dell Optiplex Micro 3060 WLAN slot to PCIe

I have an old Dell Optiplex Micro 3060 PC that I'd like to re-purpose as a Proxmox host. One of the VMs I would like to virtualize is pfSense, but I realise that I would need 2 NICs for it (Intel ones ...
Shalan's user avatar
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Issue with PC waking up immediately after entering sleep mode

I have a new PC that I was very excited about until I realized that it consistently refuses to enter sleep mode. More precisely, it wakes up immediately after being put to sleep. This is very ...
Mickaël's user avatar
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Is this clip repairable?

On my Gigabyte X670E Aorus Master I noticed that the clamp of the PCIex 5.0 16x connector seems damaged: Is it repairable? I'm afraid it can lead to wrong contact of the graphic board.
Mark's user avatar
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SATA Card Blocks On-Board RAID Controller

I have a PCI-Express two-port SATA card (from SSU). It is model SU-SATA3-T2. I'm installing it in a Dell Optiplex 990. The Dell motherboard part number is 06D7TR. The card seems to work, but with one ...
Herb Ray's user avatar
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What is the difference between pcie root complex and host bus adapter

In this Wikipedia link PCI Express I found a diagram of pcie where the cpu is connected to the pcie bus and devices through the root complex and then I saw this link Host adapter which says that the ...
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How PCIe lanes are splitted when MB supports 1 PCI 4.0 x16 and 1 PCI 3.0 x16 slots?

I have an AMD 5800x, which has 20 pcie 4.0 lanes. I want to put 2 GPUs (both support pcie 4.0) in a motherboard with 2 PCIe x16 slots, but 1 of them is version 4, and another is version 3. 4 lanes are ...
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Why is my GTX 970 working with the motherboard HDMI port, and why is my iGPU disabled on Asus ROG Strix Z690-A gaming WIFI motherboard?

I wanted to test the integrated graphics on my i7 12700 K CPU, so I unplugged the HDMI from the GTX 970 card and plugged it in the motherboard HDMI port. To my surprise, the 970 card was being output ...
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Linux won't post with (amd 340x) gpu in the pcie slot. (MacMini running Linux)

I'm running Ubuntu 22 on an intel Core 2 Duo MacMini. It's a 64-bit OS, but the EFI is 32-bit. The motherboard uses a fully featured mini-pcie slot for its network card, which has proven to be able to ...
FlashStopFall's user avatar
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Does a RTX 3070 Ti with 2 x 8 PCIe power cables draw power from the PCIe slot?

I wonder if a RTX 3070 Ti with 2 x 8 PCIe power cables will draw power from the PCIe slot. I don't refer to the standby power, but to the main power. Will it be zero or will it draw its main power ...
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NVMe PCIe SSD using 2 lanes instead of 4

I recently installed an WD Blue SN570 500GB NVMe SSD in my HP laptop and I did a benchmark test in crystal disk software and got 1700MBps read speed but this SSD supports 3500MBps. When I checked in ...
Chaitanya M's user avatar
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Wha functionalities does "Signal processing controller: Intel Corporation 100 Series/C230 Series Chipset Family Thermal Subsystem (rev 31)" provide?

I'm setting up libvirt powered virtual machine for Windows10, on my Debian host, with passthrough-ed NVIDIA GPU. Everything goes well until I want to passthrough a USBHUB into the VM for convenience ...
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Diagnosing an intermittently failing M2 PCIe I225v NIC in PCI passthrough

I am using a M2 PCIe I225v NIC (http://www.iocrest.com/index.php?id=2316) as a PCI passthrough on my Proxmox host - passed to a pfSense VM (running freeBSD-14, but same occurs on freeBSD-13). It's ...
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