Question about rear USB ports


Gas

Gas

Well-known member
Local time
11:35 PM
Posts
25
OS
Windows 11
Hi all, I am going to build a new PC, the motherboard will be an (MSI MAG B850 TOMAHAWK MAX WIFI) on the manual I see that some of the rear USB ports are from CPU and some are from chipset:
● 1x Clear CMOS Button
● 1x Flash BIOS Button
● 1x HDMI™ port
● 3x USB 10Gbps Type-C ports (From CPU)
● 2x USB 10Gbps Type A port (From CPU & B850 Chipset)
● 1x USB 5Gbps Type A (From B850 Chipset)
● 4x USB 2.0 connectors (From HUBGL850)
● 1x 5G LAN (RJ45) port
● 2x Wi-Fi antenna connectors
● 2x audio jacks
● 1x Optical S/PDIF Out connector
I wonder if there is any difference in performance between these types of USB ports. I did some web search but i did not find any clear answer, I am sure that in the forum there is someone informed about this matter.
Thanks in advance for any help/clarification
Gas
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self-made
    CPU
    intel i7-2600
    Motherboard
    Asus P8Z68MPRO
    Memory
    32 GB TIMETEC
    Graphics Card(s)
    Nvidia RTX 3600
    Monitor(s) Displays
    EIZO CS240
    Screen Resolution
    1920X1200
    Hard Drives
    Main - Samsung 870EVO
    PSU
    SilentStorm Cool Zero 750W
    Other Info
    Mostly used for photo retouching software, some video slideshows.
The potential performance/speed is as stated in Gbps, the only omission is the 4 x USB 2.0 ports/connectors which are 480 Mbps Type A.

The unclear bit is what hardware you may choose to connect to those ports.

e.g. The illustration on p15 of your manual hints at what sort of devices you will likely connect e.g. keyboards, mice, printers etc to the USB 2.0 ports, that hardware does not need to use the higher performance/speed USB ports.
 

My Computer

System One

  • OS
    Windows 11
1.webp

USB 2.0 = 2,5 W
USB 3.0/3.1 = 4,5 W
USB 3.2/4 = 7,5 W

It's more important what you have on your computer case, more often than not you plug something in there.
 
Last edited:

My Computer

System One

  • OS
    Microsoft Windows 11 Home
    Computer type
    PC/Desktop
    Manufacturer/Model
    MSI MS-7D98
    CPU
    Intel Core i5-13490F
    Motherboard
    MSI B760 GAMING PLUS WIFI
    Memory
    2 x 16 Patriot Memory (PDP Systems) PSD516G560081
    Graphics Card(s)
    GIGABYTE GeForce RTX 4070 WINDFORCE OC 12G (GV-N4070WF3OC-12GD)
    Sound Card
    Bluetooth Аудио
    Monitor(s) Displays
    INNOCN 15K1F
    Screen Resolution
    1920 x 1080
    Hard Drives
    WD_BLACK SN770 250GB
    KINGSTON SNV2S1000G (ELFK0S.6)
    PSU
    Thermaltake Toughpower GF3 1000W
    Case
    CG560 - DeepCool
    Cooling
    ID-COOLING SE-224-XTS / 2 x 140Mm Fan - rear and top; 3 x 120Mm - front
    Keyboard
    Corsair K70 RGB TKL
    Mouse
    Corsair KATAR PRO XT
    Internet Speed
    100 Mbps
    Browser
    Firefox
    Antivirus
    Microsoft Defender Antivirus
    Other Info
    https://www.userbenchmark.com/UserRun/66553205
I believe the rear USB ports are from CPU which will be faster than the mobo chipset. The CPU will handle the processing power of the rear USB. The front USB will be connected to the mobo chipset.

****

Sorry I stand corrected. I personally never asked this question myself. :-)

I wonder why the mobo specs say "from CPU"?

1738379497384.webp
 
Last edited:

My Computers

System One System Two

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    CPU
    AMD Ryzen 9 3900X
    Motherboard
    MSI MPG Gaming Edge Wifi (X570)
    Memory
    32GB Adata XPG DDR4
    Graphics Card(s)
    ASUS GTX 1070 8GB ROG
    Monitor(s) Displays
    LG Ultrawide 34"
    Screen Resolution
    3440x1440
    Hard Drives
    Main Boot Drive : 512GB Adata XPG RGB Gen3x4 NVMe M.2 SSD
    PSU
    EVGA 600 Watts Gold
    Case
    Deepcool Genome II
    Cooling
    Deepcool Fryzen
    Internet Speed
    1Gbps
    Browser
    Chrome
    Antivirus
    "Moderna"
  • Operating System
    Windows 11 Pro
    Computer type
    PC/Desktop
    CPU
    i7-4790K
    Motherboard
    ASRock Xtreme6 Z97
    Memory
    16GB Corsair Vengeance Pro
    Graphics card(s)
    MSI R9 290
    Monitor(s) Displays
    LG Ultrawide 34"
    Screen Resolution
    3440x1440
    Hard Drives
    500GB Adata SSD (OS Only)
    PSU
    Thermaltake 475 Watts 80 Bronze
    Case
    Thermaltake Commander I Snow Edition
    Cooling
    Deep Cool Archer Air Cooler
    Mouse
    Logitech G402
    Keyboard
    Armageddon MKA-5R RGB-Hornet
    Internet Speed
    1Gbps
    Browser
    Chrome
    Antivirus
    Moderna :)
badrobot said:
Sorry I stand corrected. I personally never asked this question myself. :-)

I wonder why the mobo specs say "from CPU"?
Click to expand...
Hello, and ty for your interest about this matter and i am also surprised to see that many X/B800 family motherboards have this kind of specs and you got the point of the question: is there any performance difference between USB ports managed from CPU and the ones managed from the chipset independently of the devices connected and/or the USB Type. So please readers of this thread, get it as a pure technological curiosity.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self-made
    CPU
    intel i7-2600
    Motherboard
    Asus P8Z68MPRO
    Memory
    32 GB TIMETEC
    Graphics Card(s)
    Nvidia RTX 3600
    Monitor(s) Displays
    EIZO CS240
    Screen Resolution
    1920X1200
    Hard Drives
    Main - Samsung 870EVO
    PSU
    SilentStorm Cool Zero 750W
    Other Info
    Mostly used for photo retouching software, some video slideshows.
Let me start by saying that I am not an authority on this topic, but I can tell you this:

I know that often USB ports serviced by the chipset share bandwidth. As an example, say you have two ports each rated at 10 Gbps. If the two ports share bandwidth and you try to use high speed devices on both ports at the same time then that 10 Gbps is shared between the two devices.

This was a bigger deal with USB 2 because you only had 480 Mbps and sharing that among multiple could be a real world bottleneck.
 

My Computers

System One System Two

  • OS
    Win11 Pro 24H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Kamrui Mini PC, Model CK10
    CPU
    Intel i5-12450H
    Memory
    32GB
    Graphics Card(s)
    No GPU - Built-in Intel Graphics
    Sound Card
    Integrated
    Monitor(s) Displays
    HP Envy 32
    Screen Resolution
    2560 x 1440
    Hard Drives
    1 x 2TB NVMe SSD
    1 x 4TB NVMe SSD
    1 x 4TB 2.5" SSD
    PSU
    120W "Brick"
    Keyboard
    Corsair K70 Mechanical Keyboard
    Mouse
    Logitech MX Master 3
    Internet Speed
    1Gb Up / 1 Gb Down
    Browser
    Edge
    Antivirus
    Windows Defender
  • Operating System
    Win11 Pro 23H2
    Computer type
    Laptop
    Manufacturer/Model
    Lenovo ThinkBook 13x Gen 2
    CPU
    Intel i7-1255U
    Memory
    16 GB
    Graphics card(s)
    Intel Iris Xe Graphics
    Sound Card
    Realtek® ALC3306-CG codec
    Monitor(s) Displays
    13.3-inch IPS Display
    Screen Resolution
    WQXGA (2560 x 1600)
    Hard Drives
    2 TB 4 x 4 NVMe SSD
    PSU
    USB-C / Thunderbolt 4 Power / Charging
    Mouse
    Buttonless Glass Precision Touchpad
    Keyboard
    Backlit, spill resistant keyboard
    Internet Speed
    1Gb Up / 1Gb Down
    Browser
    Edge
    Antivirus
    Windows Defender
    Other Info
    WiFi 6e / Bluetooth 5.1 / Facial Recognition / Fingerprint Sensor / ToF (Time of Flight) Human Presence Sensor
  • Helpful
Reactions: Gas
Thank you for your interesting clarification, no bandwidth sharing on USB ports, only 1 PCIE and one M2 connections share the bandwidth, see the attached diagram.
 

Attachments

  • MSI-MAG-B850-Tomahawk-Max-WiFi-block-diagram.jpg.webp
    MSI-MAG-B850-Tomahawk-Max-WiFi-block-diagram.jpg.webp
    38.4 KB · Views: 1

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self-made
    CPU
    intel i7-2600
    Motherboard
    Asus P8Z68MPRO
    Memory
    32 GB TIMETEC
    Graphics Card(s)
    Nvidia RTX 3600
    Monitor(s) Displays
    EIZO CS240
    Screen Resolution
    1920X1200
    Hard Drives
    Main - Samsung 870EVO
    PSU
    SilentStorm Cool Zero 750W
    Other Info
    Mostly used for photo retouching software, some video slideshows.
The GL850 is a USB hub controller, drawing is a bit misleading.

This is a fun read:

USB in a NutShell - Chapter 1 - Introduction

Introduces the Universal Serial Bus covering the various chapters of the spec and what is required to be read.
beyondlogic.org beyondlogic.org
 
Last edited:

My Computer

System One

  • OS
    Win 11 Pro Workstation 23H2 22631.4830
    Computer type
    PC/Desktop
    Manufacturer/Model
    Manmade
    CPU
    Xeon W7-3455
    Motherboard
    Gigabyte MW83-RP0
    Memory
    256Gb
    Graphics Card(s)
    RTX 4500 ADA
    Sound Card
    RealTek
    Monitor(s) Displays
    LG 32UN650P
    Screen Resolution
    3840x2160
    Hard Drives
    Boot: Transcend TS1MTE250H. Storage: Sabrent SB-RKT4P. Backup: Toshiba MG08ADA600E
    PSU
    Corsair 850W
    Case
    BeQuiet 802
    Cooling
    Noctua D9
    Internet Speed
    47Mb
    Browser
    Edge
    Antivirus
    Defender
    Other Info
    23H2 (OS Build 22631.4830)
MrPig said:
The GL850 is a USB hub controller, drawing is a bit misleading.

This is a fun read:

USB in a NutShell - Chapter 1 - Introduction

Introduces the Universal Serial Bus covering the various chapters of the spec and what is required to be read.
beyondlogic.org beyondlogic.org
Click to expand...
Thank you so much, this is a kind of an encyclopedia about USB, I really appreciate.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self-made
    CPU
    intel i7-2600
    Motherboard
    Asus P8Z68MPRO
    Memory
    32 GB TIMETEC
    Graphics Card(s)
    Nvidia RTX 3600
    Monitor(s) Displays
    EIZO CS240
    Screen Resolution
    1920X1200
    Hard Drives
    Main - Samsung 870EVO
    PSU
    SilentStorm Cool Zero 750W
    Other Info
    Mostly used for photo retouching software, some video slideshows.
You must log in or register to reply here.

Similar threads

Solved memory cards on my usb ports
Replies
16
Views
2K
Wynona
Wynona
USB Ports stopped working after reboot
Replies
1
Views
1K
Rollback_Jockey
Rollback_Jockey
all in one usb ports to usb A port connector. regarding
2
Replies
22
Views
3K
SlicEnDicE
SlicEnDicE
Solved How to make the usb ports turn off when laptop is turn off
2
Replies
28
Views
8K
MilesAhead
MilesAhead
USB Ports
Replies
15
Views
1K
Winuser
Winuser

Latest Support Threads

Latest Tutorials

Back
Top Bottom