TIP: Always put high-Hz keyboard and high-Hz mouse on SEPARATE DEDICATED USB CHIPS.

[dervu]

So if so many motherboards do not have second PCI-E slot that goes straight to CPU, then what is the point giving advice for high Hz mouse to be put on separate usb card that would use that slot, when majority of people will not even have motherboard that could make use of that card properly?
Even if it is only about having separate usb controller from the motherboard one, then how to get rid of such intermittent frequency drop issues like on graph I posted above?

[Chief Blur Buster]

That being true.

However, most people only have one PCIe card: the GPU and nothing else. It’s very rare you don’t have a x1 slot (8000Hz mouse only needs a tiny x1 slot).

If you’re a pro user with a video capture card and a 10 gigabit Ethernet card, and have a gigantic heatsink blocking one PCIe slot too, read on — see solutions below:

Also, hacks exist.

(A) x1 PCIe riser ribbon extension cables are available for purchase too — can also allow you to use a PCIe USB card externally or in a slotless area of your computer. You can fit some of those x1 PCIe slot-extension cables sometimes in the obstructed spare slot underneath a triple-width GPU (or overhanging gigantic heatsink etc), snake the ribbon cable under your GPU to open space, and dangle the USB port card in open air outside the rear of the PC, if absolutely necessary. Clever, huh?

* Or build a tiny black box for it and tape the black box to a different part of your PC. Or even just wrap the USB3 card in black duct tape to protect the circuit board from shorting against the metal of your computer case. Be creative in how you protect the bare USB card.

Google “x1 PCIe riser cable” on Amazon or ebay. PCIe USB cards don’t need more than x1 slot to support an 8000Hz mouse, and x1 is less error-critical than x16, and can tolerate a short extension cable, usually. Heck, try two — including one shorter — a different cable may be higher quality, since riser cables are sometimes lottery. Keep it as short as you feasibly can. Some are lower-profile and some PCIe connectors have 90-degree turns. Find a custom riser cable that fits where you need it to fit. You probably only need 4 or 6 inches.

(B) Wait, there’s more.
If your motherboard has a Thunderbolt port (not just a USB-C port), use a true real Thunderbolt hub and plug your mouse into that. Just don’t plug anything else into that thunderbolt hub, so 100% of that Thunderbolt port is dedicated to the 8000 Hz mouse. A bit overkill, but Thunderbolt has pretty low latency compared to USB, and you’re simply pushing a dedicated USB chip into the external Thunderbolt hub.

(C) No, I’m still not finished yet.
Does your motherboard have a USB-C port? Sometimes it’s on its own dedicated chip. Use a USB-C-to-USB-A adaptor. It’s not as good as Thunderbolt, but it may bypass a crappy USB-A port tree.

(D) Wait, I’ve got yet more too.
Some NVIDIA GPUs has one of their multiple video outputs in the form of a USB-C connector instead of a DisplayPort connector. You can connect regular USB accessories to these ports! Yep. One of the video ports is sometimes also a USB-C port on your GPU. It’s also fair game for an 8000 Hz mouse too.

(E) Um, I’m not finished yet.
Do you have a spare USB2 or USB3 motherboard header? Check your motherboard manual, there may be a big surprise of extra unused USB ports on your motherboard that is idling on its own unused dedicated circuitry. Often they are for front ports or top-surface ports, but many cases have fewer USB ports than USB headers on the motherboard.

If you’re willing to be creative, you can usually workaround an 8000 Hz issue without a motherboard replacement. It’s fortunately very rare that you can’t do any of these creative workarounds. Some of these are still a pain, but less painful than a motherboard replacement.

There’s usually overlooked low lying apples. Check these unexpected places.

[DudeBeFishing]

Figured this is the right thread for this information.

The Asrock X570S PG Riptide has 3 USB controllers. The mouse labeled port is on the same controller as the other rear light blue ports. It's kinda an odd choice. Users are more likely to use the rear ports than use the internal headers. These ports are connected directly to the CPU, so maybe it's less of an issue if other devices are connected to these ports.

Controller 1:
Rear IO, Black USB ports
Motherboard, bottom right USB 3 header (#18 in manual)

Controller 2:
Rear IO, keyboard label
Rear IO, USB-C port
Motherboard, middle right USB 3 header (#12 in manual)
Motherboard, USB 2.0 headers (#22 #23 in manual)

Controller 3:
Rear IO, Mouse label
Rear IO, 3x light blue USB ports

Here's pictures that hopefully explain the USB controller layout better:

https://i.imgur.com/ytIOUWm.jpeg
https://i.imgur.com/C6J3F5h.png

[chandler]

Figured this is the right thread for this information.

The Asrock X570S PG Riptide has 3 USB controllers. The mouse labeled port is on the same controller as the other rear light blue ports. It's kinda an odd choice. Users are more likely to use the rear ports than use the internal headers. These ports are connected directly to the CPU, so maybe it's less of an issue if other devices are connected to these ports.

Controller 1:
Rear IO, Black USB ports
Motherboard, bottom right USB 3 header (#18 in manual)

Controller 2:
Rear IO, keyboard label
Rear IO, USB-C port
Motherboard, middle right USB 3 header (#12 in manual)
Motherboard, USB 2.0 headers (#22 #23 in manual)

Controller 3:
Rear IO, Mouse label
Rear IO, 3x light blue USB ports

Here's pictures that hopefully explain the USB controller layout better:

https://i.imgur.com/ytIOUWm.jpeg
https://i.imgur.com/C6J3F5h.png

yes I was wondering the same about my motherboard as well (ASUS Z690-F)

Ive connected my DAv3 mouse(labeled 1 in the pic below) , my Schiit HEL headphones amp (labeled 2) and my K70 MK.2 keyboard which is running at 1000Hz (labeled 3)



can someone say if its the correct way to connect my devices ?

**Also, can somebody please help me with USB interrupt affinity for my mouse? specifically with how do I identify the usb device which is the mouse? and do I bind the whole controller that the mouse is plugged into or just the device itself ?

[DudeBeFishing]

I can't tell looking in the manual. What I would do is use the USB Device Tree Viewer app, or open Device Manager and view devices by connection. From there you can plugin a USB device to different ports and see which controller it shows up under.

If using Device Manager, right click and go to Properties of the USB Composite Device, look for "Bus reported device description", this should tell what the device is. It's a little cumbersome doing it this way.

If the USB controller is directly below PCI Express Root Port, it's most likely on the CPU. If it's below PCI Express Downstream Switch Port, then it's most likely on the chipset.

Here's what mine looks like under USB Device Tree Viewer and Device Manager.

https://i.imgur.com/4S5L0cO.png

[chandler]

I can't tell looking in the manual. What I would do is use the USB Device Tree Viewer app, or open Device Manager and view devices by connection. From there you can plugin a USB device to different ports and see which controller it shows up under.

If using Device Manager, right click and go to Properties of the USB Composite Device, look for "Bus reported device description", this should tell what the device is. It's a little cumbersome doing it this way.

If the USB controller is directly below PCI Express Root Port, it's most likely on the CPU. If it's below PCI Express Downstream Switch Port, then it's most likely on the chipset.

Here's what mine looks like under USB Device Tree Viewer and Device Manager.

https://i.imgur.com/4S5L0cO.png

Checked this on another PC (Im away from my main right now) , mouse in under PCI Root Complex, dont see the "downstream switch" at all (checked in the device manager)

**every system I have is Intel-based, if it matters - dont have AMD at all, my main PC processor is 12700kf .

[BTRY B 529th FA BN]

haven't been following but have you checked the manual PDF? Was looking at a MSI X670 Ace and Godlike and both manuals show which USB ports are direct connections to the CPU

[chandler]

haven't been following but have you checked the manual PDF? Was looking at a MSI X670 Ace and Godlike and both manuals show which USB ports are direct connections to the CPU

Umm I didn't find it on Z690-F manual.... I dont wanna think Ive missed this..

Can someone please look at the manual ? of the ASUS STRIX Z690-F ?

on your MSI Ace mobo it says right in the first few pages :


lower case converter

right here?
I dont have anything like it in my manual

from what I understand the Godlike model doesnt have USB controllers connected straight to CPU ? everything is X670 Chipset there

[HarryDrews]

Interesting...

According to MSI, my MB (PRO Z790-P) only offers Chipset USB ports, and recommends using (ports adjacent to one another for M/KB.

I read Blur Buster Chief's alternatives comment earlier, but I'm unsure what options I have with my given specs. Am I best off adding USB ports via PCIe expansion, or using the USB ports connected to Chipset?

Specs:
- Intel i7 14700k
- MSI Pro Z790-P
- 4080 Super

Ports listed:
∙ 2x USB 3.2 Gen 1 5Gbps Type-A ports (From Z790 chipset)
∙ 1x USB 3.2 Gen 2 10Gbps Type-A port (From Z790 chipset)
∙ 1x USB 3.2 Gen 2x2 20Gbps Type-C port (From Z790 chipset)
∙ 4x USB 2.0 Type-A ports (From Z790 chipset)

MSI MANUAL:
https://download.msi.com/archive/mnu_ex ... -PWIFI.pdf

[chandler]

Figured this is the right thread for this information.

The Asrock X570S PG Riptide has 3 USB controllers. The mouse labeled port is on the same controller as the other rear light blue ports. It's kinda an odd choice. Users are more likely to use the rear ports than use the internal headers. These ports are connected directly to the CPU, so maybe it's less of an issue if other devices are connected to these ports.

Controller 1:
Rear IO, Black USB ports
Motherboard, bottom right USB 3 header (#18 in manual)

Controller 2:
Rear IO, keyboard label
Rear IO, USB-C port
Motherboard, middle right USB 3 header (#12 in manual)
Motherboard, USB 2.0 headers (#22 #23 in manual)

Controller 3:
Rear IO, Mouse label
Rear IO, 3x light blue USB ports

Here's pictures that hopefully explain the USB controller layout better:

https://i.imgur.com/ytIOUWm.jpeg
https://i.imgur.com/C6J3F5h.png

yes I was wondering the same about my motherboard as well (ASUS Z690-F)

Ive connected my DAv3 mouse(labeled 1 in the pic below) , my Schiit HEL headphones amp (labeled 2) and my K70 MK.2 keyboard which is running at 1000Hz (labeled 3)



can someone say if its the correct way to connect my devices ?

**Also, can somebody please help me with USB interrupt affinity for my mouse? specifically with how do I identify the usb device which is the mouse? and do I bind the whole controller that the mouse is plugged into or just the device itself ?

can somebody please help me with this?? Im desperate here because I just discovered what I suspect to be ONLY ONE USB CONTROLLER ON THE ENTIRE MOTHERBOARD

wrote about it in this post :

viewtopic.php?f=2&t=13239

basically here's what it looks like



**EDIT : Also, when not assigning any core in the affinity tool, just by running latencymon, I see that core 4/5 start getting high dpc/isr while moving the mouse - NOT core0 - is that normal ?