Question about rear USB ports


Gas

Gas

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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
 

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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.
 

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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:

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    MSI MS-7D98
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    Intel Core i5-13490F
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    MSI B760 GAMING PLUS WIFI
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    2 x 16 Patriot Memory (PDP Systems) PSD516G560081
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    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:

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    ASRock Xtreme6 Z97
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    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 Computers

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    Windows 11
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    Self-made
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    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.
  • Operating System
    W11, always updated with latest builds
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self built
    CPU
    AMD Ryzen 9 9900X
    Motherboard
    ASUS TUF Gaming B850-Plus WiFi
    Memory
    G.Skill Trident Z5 Neo RGB 32GB Kit DDR5-6000 CL30 (F5-6000J3038F16GX2-TZ5NR)
    Graphics card(s)
    ASUS Dual GeForce RTX™ 3060 V2 OC Edition 12GB GDDR6- From System 1
    Monitor(s) Displays
    Eizo CS240, Calibrated with Datacolr SpyderX
    Screen Resolution
    1920X1200
    Hard Drives
    Crucial T705 SSD 1TB PCIe Gen5 NVMe M.2- SO+Archive
    Lexar EQ790 1TB SSD M.2 2280 PCIe Gen4x4 NVMe 1.4- LR& PS Workspace
    PHIXERO SSD P5000-512GB M.2 2280 PCIe Gen4- Backups
    Seagate ST8000DM04- Photo Archive, SATA HD - From System 1
    Western Digital WD2002FAEX- Generic archive, SATA HD - From System 1
    PSU
    Be Quiet 850W Pure Power 12M per Pc ATX
    Case
    Phanteks XT Pro
    Cooling
    Be quiet Pure loop 2 360mm
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    Logitech
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    D/L-700/800 Mbps; U/L 250/300 Mbps WiFi 7 from motherboard
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    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.
 

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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
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My Computers

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  • 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.
  • Operating System
    W11, always updated with latest builds
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self built
    CPU
    AMD Ryzen 9 9900X
    Motherboard
    ASUS TUF Gaming B850-Plus WiFi
    Memory
    G.Skill Trident Z5 Neo RGB 32GB Kit DDR5-6000 CL30 (F5-6000J3038F16GX2-TZ5NR)
    Graphics card(s)
    ASUS Dual GeForce RTX™ 3060 V2 OC Edition 12GB GDDR6- From System 1
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    Eizo CS240, Calibrated with Datacolr SpyderX
    Screen Resolution
    1920X1200
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    Crucial T705 SSD 1TB PCIe Gen5 NVMe M.2- SO+Archive
    Lexar EQ790 1TB SSD M.2 2280 PCIe Gen4x4 NVMe 1.4- LR& PS Workspace
    PHIXERO SSD P5000-512GB M.2 2280 PCIe Gen4- Backups
    Seagate ST8000DM04- Photo Archive, SATA HD - From System 1
    Western Digital WD2002FAEX- Generic archive, SATA HD - From System 1
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    Be Quiet 850W Pure Power 12M per Pc ATX
    Case
    Phanteks XT Pro
    Cooling
    Be quiet Pure loop 2 360mm
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    Logitech
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    D/L-700/800 Mbps; U/L 250/300 Mbps WiFi 7 from motherboard
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    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
 
Last edited:

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    Xeon W7-3455
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    Gigabyte MW83-RP0
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    24H2 26100.4061
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
Click to expand...
Thank you so much, this is a kind of an encyclopedia about USB, I really appreciate.
 

My Computers

System One System Two

  • 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.
  • Operating System
    W11, always updated with latest builds
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self built
    CPU
    AMD Ryzen 9 9900X
    Motherboard
    ASUS TUF Gaming B850-Plus WiFi
    Memory
    G.Skill Trident Z5 Neo RGB 32GB Kit DDR5-6000 CL30 (F5-6000J3038F16GX2-TZ5NR)
    Graphics card(s)
    ASUS Dual GeForce RTX™ 3060 V2 OC Edition 12GB GDDR6- From System 1
    Monitor(s) Displays
    Eizo CS240, Calibrated with Datacolr SpyderX
    Screen Resolution
    1920X1200
    Hard Drives
    Crucial T705 SSD 1TB PCIe Gen5 NVMe M.2- SO+Archive
    Lexar EQ790 1TB SSD M.2 2280 PCIe Gen4x4 NVMe 1.4- LR& PS Workspace
    PHIXERO SSD P5000-512GB M.2 2280 PCIe Gen4- Backups
    Seagate ST8000DM04- Photo Archive, SATA HD - From System 1
    Western Digital WD2002FAEX- Generic archive, SATA HD - From System 1
    PSU
    Be Quiet 850W Pure Power 12M per Pc ATX
    Case
    Phanteks XT Pro
    Cooling
    Be quiet Pure loop 2 360mm
    Mouse
    Logitech
    Keyboard
    Logitech
    Internet Speed
    D/L-700/800 Mbps; U/L 250/300 Mbps WiFi 7 from motherboard
    Browser
    Edge
    Antivirus
    Avast
    Other Info
    Mostly used for photo retouching software, some video slideshows.
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