Questions tagged [bus]

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1answer
29 views

Is it possible to saturate the memory bus using high frequency DDR4 memory, even if a motherboard claims support for it?

So a friend of mine asked for some DDR4 memory recommendations since he was still using DDR3 and wanted to buy a new motherboard, preferably B450 chipset so he could buy a Ryzen. I told him to buy a ...
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1answer
43 views

Unable to Bind NIC to Driver VFIO-PCI

Context I'm attempting to run the packet generator MoonGen, however, it requires me to bind a NIC to the VFIO-PCI driver. Therefore, I must first unbind a NIC from its current driver, then rebind it ...
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30 views

SD Card Reader Standards [closed]

So I am confused about the SDXC read standards compatability. I understand that UHS-I/II/III/Express define bus interfaces and UHSII added a 2nd row of pins. UHSIII achieves higher speeds than that. ...
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1answer
75 views

Where is Hardware Firmware Stored?

Where is the firmware for a device such as a mouse integrated into a laptop? And how can I access it using Linux. so far I have tried querying the pci Bus using lspci | grep rom, however I have only ...
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16 views

Azure Service Bus Listener IP

I have an Azure Service Bus with topics and subscriptions. There are multiple listeners that are listening to a specific subscription. In other words such processes share a subscription. For ...
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2answers
52 views

How can I determine the bus clock programatically or via command line in Windows 10?

I want to write a program that displays some system information. How can I programmatically determine the clock speed of the bus?
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1answer
155 views

Bandwidth with NvLink for a graphics card

I'm reading the NvLink specs and there's a table which says Semiconductor|Interconnect| Sublink data-rate per data direction | Total data rate (out+in) Nvidia V100 |NVLink 2.0 | 200 Gbit/s = 25 ...
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1answer
70 views

How does a machine interpret serial data from an external serial bus?

Most external buses (e.g. USB) transfer data in a serial manner. However, a machine like a PC needs to turn this into parallel data to interpret it? How does it do so? Edit: If most computers operate ...
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55 views

For this particular motherboard where are the address and data lines (circuit traces) connecting the RAM to the CPU?

This motherboard from an Acer Laptop was given to me by someone I work with who knows I've been getting interested in computers. You can see the two RAM slots but I can't for the life of me figure out ...
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2answers
1k views

What is the advantage of SATA that SAS does not have?

What is the advantage of SATA that SAS does not have? There are a lot of storage enterprise(For example HGST) that release the same models with two interface as SAS and SATA. And when I see the spec ...
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2answers
787 views

Process on on Arch Linux running out of memory at 7.6GB in spite of 16GB RAM followed by bus errors

I try to use a large chunk of memory in R, of a size of about 7.6 GB. My system has 16 GB RAM, so I did not expect this to be a problem. However, R prevents this, and attempting to circumvent it leads ...
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1answer
2k views

All USB ports on motherboard running through the same bus

I have a Gigabyte H87-HD3 motherboard. According to the specification it supports up to 8 USB 2.0/1.1 ports. Now I try to connect a device that is non-compatible with USB 3.0. It does not work on any ...
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103 views

How does display (LCD/LED) connects to system bus?

The problem arose for me when I realized that the Laptops/PCs use two GPUs (one of them is an On-Chip low-performance and the other is an external high-performance GPU), and switch between these two ...
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0answers
72 views

How to check whether each USB3 port has a dedicated USB3 bus?

I am trying to setup multiple cameras. I want to know if my PC can handle the bandwidth of additional cameras. Currently, two cameras work fine but I want to be sure that it can handle also two extra ...
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233 views

Does the PCI bus for a device remain the same across mulitple computers that have the same BIOS, Operating System, and in the same PCIe slot?

My operating system is windows 10. I have a bat file that calls a device based on the bus number. This bat file will be copied to each PC and then cannot be changed. There are more then one of the ...
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0answers
69 views

How is it possible in this `cat` process that more bytes are being written than read?

I ran the following bash command to merge several big files cat file1.txt file2.txt file3.txt file4.txt > merged.txt The process is very long as the files make about 12 GB each. On the activity ...
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1answer
33 views

How is the segment size related to the number of bits in the buses?

If I have the width of each register as 32 bits, the width of the data bus is 16 bits and the width of the address bus is 24 bits, what is the segment size?
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168 views

How PCI-E Lanes are Allocated on Socket AM1 Systems

One of the major limitations of the budget AM1 platform by AMD is that CPUs in this platform only support 4 PCI-E 2.0 lanes for external bus communications (PCI-E slots on the motherboard). Most ...
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2answers
202 views

Can I put processor with DMI bus to motherboard with QPI bus?

I found out differences of QPI and DMI processors. Thanks answers for this question. As I understand, QPI processors (Xeon E5-2xxx series) is used for multi-processor systems. But I want create one-...
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2answers
2k views

How are integrated SD-card readers connected?

Many laptop computers now feature integrated SD-card readers so that users can read/write SD-cards without needing to plug an external reader into a USB port. Are these integrated SD-card readers ...
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1answer
14k views

How is the device determined in PCI enumeration? (bus/device/function)

I am confused about PCI Bus/Device/Function enumeration. Looking at the Wikipedia page for PCI configuration, I see that for a given bus, the master will request vendor ID and device ID for all ...
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2answers
2k views

Is it true that embedded graphics cards reduce the CPU's performance?

Consider the Intel HD Graphics. The video card resides inside the cpu die and uses ordinary system RAM. Therefore, it uses up Front Side Bus and Northbridge bandwidth. Therefore, accessing the main ...
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2answers
862 views

If a 32-bit microprocessor has 24-bits of address space, why is the answer for the maximum number of addresses (2^24) given in bytes and not bits?

I'm working on this for homework and it seems all of my classmates and various online sources are saying that the simple calculation of 2^24-bits results in ~16,000,000-bytes instead of bits. Why is ...
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1answer
2k views

Is the Front Side Bus part of the CPU or the Motherboard?

Something I'm working on wants a very fast/wide Front Side Bus (FSB). What component is the FSB part of? Is it part of the CPU or the motherboard? Is it something that can be placed on a board, or is ...
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1answer
191 views

Extend ribbon cable

tl;dr: How do I find out the specification of any ribbon cable, like diameter, resistance, and so on? I recently bought a DRAC (Dell Remote Access Controller) for my PowerEdge2900 off ebay ...
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1answer
517 views

How to fix clock multiplier, it is 8x with 100 MHz Bus speed?

May laptop (HP G7) which is a low end laptop but can can overloaded even multiple tabs. I have seen it loading very slow if I search images on google search. I recently installed CPU-Z and found that ...
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2answers
1k views

What is the limit on the device number in Linux for a USB bus?

I am developing a remote monitoring device using a Raspberry Pi. In order to provide me with alerts it has 3G dongle in it. However, due to power supply instability the dongle will sometimes change ...
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0answers
251 views

How to drive this smartkey?

Feel free to migrate this question if it does not suit SuperUser SE aim. It might be a topic for StackOverflow or Unix & Linux SE. Anyway, here I am... I would like to interface a smartkey, lets ...
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1answer
6k views

How to emulate a virtual USB drive in Windows?

I have a remote server where I should test work of some application with USB drive. Unfortunately, there is no ability to install any USB drive there. So, I need to emulate a virtual USB drive in ...
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1answer
175 views

Which BUS supports shared IRQs and BUS mastering? [closed]

I'm having a bit of trouble figuring out the selective choices here. PCI ISA VGA USB I'm going out on a limb here but I don't want it to break. PCI? No? What would it be, then?
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1answer
623 views

What interface do I need for my graphics card?

The motherboard died on a gaming laptop belonging to a friend of mine, and I am rebuilding it as a desktop as a favor for him. According to the specs from alienware's website and several ...
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0answers
19 views

How do I test a bus connection for functionality?

How can I determine if I have a good profibus connection? I want to be able to test my hard wire connection to make sure that isn't the problem. Ideally I would like to be able to test it at up to ...
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1answer
129 views

Do certain laptops, say Macbooks, have significantly better hardware buses than others?

Many modern laptops do not allow one to change the memory banks, as they are welded in, especially ultrabooks and Macbooks seem to have this 'feature'. I've heard that sometimes this idea is ...
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1answer
712 views

What does PCI (not PCI-E) bus speed of 66MHz really mean?

According to this article , the bus is the circuit that connects the motherboard . The faster the speed of the bus , the quicker data can be transferred . Bus speed is measured in MHz (Mega Hertz) and ...
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36 views

Shortcut method to find the front side bus and memory bus speed of your computer [duplicate]

I can easily find out the RAM, Processing Speed of my Windows computer by clicking the Properties section of Computer. Is there any shortcut method similar to the above to find the front side bus ...
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2answers
825 views

Are all peripherals directly connected to system bus?

System bus has control, address and data buses, as we can see in this picture I think the front-side bus and memory bus is directly on the system bus, but what about the PCIExpress and PCI buses, are ...
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3answers
10k views

What's the difference between a hardware register and a memory-mapped register?

This has been puzzling, so I'll lay it all out here. Apparently, through MMIO, you can access external devices using a certain memory-mapped address, which would then be re-routed to that device ...
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0answers
526 views

What is in-service expansion in token passing bus network?

I was reading about Token Ring network and it said "in-service expansion is possible in a token passing bus network". What does it mean?
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2answers
8k views

How do device driver instructions program the GPU?

Say I am using a computer, any typical modern computer more or less. A device driver is responsible for everything I see on my screen, including right as I type this the screen is updated(this is, of ...
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3answers
31k views

Finding hardware information on linux without lspci

I have an ARM device running ArchLinux. The device doesn't appear to have any PCI bus, even though it has USB. [root@alarm ~]# lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub ...
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1answer
2k views

Identifying a small IDE connector

I'm in the possession of the GENE-9455: At the top left corner there is an IDE connector, however, this is not a normal IDE connector, it's a smaller one. I need to find a cable for this connector. I ...
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1answer
107 views

Is a multiplexed system/address bus slower? [closed]

When a address bus is multiplexed it typically send addresses in two consecutive parts. Thus for a 32 bit bus one only need 16 wires. Typically, (if I get this correct): 4 bit bus: +-------------+...
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0answers
110 views

64x Not working, despite my desperate tries

So this is really weird, and extremely annoying. I've tried to install a 64x-version of some Linux distributions, such as Linux Mint, Ubuntu, Xubuntu, etc. But none has been successful. I am able to ...
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2answers
2k views

When I connect 4 USB drives to my PC at the same time, does each slot have 480 Mbit/s?

When I connect 4 USB drives to the 4 available slots on a PC at the same time, does each slot have theoretical 480 Mbit/s or will it be quartered and every port will only have 120 Mbit/s? Does this ...
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1answer
331 views

Slower cpu (pstate) = slower ram performance?

I noticed that if I lower my CPU clock speed via P-states/SpeedStep, my RAM slows down. However, through CPU-Z, my HT link, which is what connects my CPU to the memory, is still running at the same ...
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0answers
248 views

Understanding Bus Architecture Terminology

I've read several books which talked about bus architectures. Each one uses a myriad of terms. Can someone help sort these out for me? system bus external data bus internal data bus front-side bus ...
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1answer
128 views

What are the frequencies of current in computers' external peripheral cables and internal buses?

From Wikipedia, three different cases of current frequency are discussed along with the types of cables that are suitable for them: An Extra Ordinary electrical cables suffice to carry low ...
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1answer
1k views

Meaning of “expansion bus” or “peripheral bus”

From my last post https://superuser.com/questions/464608/expansion-bus-and-peripheral-bus, "expansion bus" or "peripheral bus" are said to be the same concept. My questions here are not the same as ...
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2answers
7k views

How is the communication between northbridge and southbridge like?

How is the connection/communication between northbridge and southbridge like? It seems that data must pass from the CPU to the northbridge, and then again over a PCI bus to the southbridge, based on ...
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1answer
829 views

Are SATA,USB, Ethernet, mouse, keyboard, serial/parallel ports connected to Southbridge via PCI bus?

From Wikipedia: I was wondering how to understand the right-down corner of the picture? Are SATA,USB, Ethernet, mouse, keyboard, and serial/parallel ports connected to Southbridge via PCI bus? In ...