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USB LATENCY ANALYZER V2
Posted: 12 Dec 2025, 15:41
by Watchdog
Someone created a powershell script that tests and checks if you are using the lowest latency USB controller of your PC. On my MOBO which is ASUS ROG STRIX B650E-F it has two USB 3.2 Type A Gen 2 ports. So I plugged my Wooting 80HE and my mouse on those two USB ports, upon checking it with the latency analyzer it shows that only one USB is working as it should. Any idea why?
https://imgur.com/a/HarVShc
Re: USB LATENCY ANALYZER V2
Posted: 12 Dec 2025, 15:52
by ablemor
I don't understand you, are you asking for a USB -> CPU connection? Use the USB-C ports, those are definitely the ones.
Re: USB LATENCY ANALYZER V2
Posted: 12 Dec 2025, 18:03
by Watchdog
ablemor wrote: ↑12 Dec 2025, 15:52
I don't understand you, are you asking for a USB -> CPU connection? Use the USB-C ports, those are definitely the ones.
Yes, as shown in the picture that I've sent. I am trying to reduce latency of my Wooting 80HE(like my Endgame mouse in the pic) by making sure that it doesn't go through hub/chipset connection. My Wooting 80HE is 8k polling rate, is it still 8k polling rate if I use USB-C ports to connect my Wooting?
Re: USB LATENCY ANALYZER V2
Posted: 12 Dec 2025, 21:10
by vnb
Watchdog wrote: ↑12 Dec 2025, 15:41
Someone created a powershell script that tests and checks if you are using the lowest latency USB controller of your PC. On my MOBO which is ASUS ROG STRIX B650E-F it has two USB 3.2 Type A Gen 2 ports. So I plugged my Wooting 80HE and my mouse on those two USB ports, upon checking it with the latency analyzer it shows that only one USB is working as it should. Any idea why?
https://imgur.com/a/HarVShc
i got you mate. Asus Support provided this to me a while ago. I asked them for a graphic with annotations of which USBs goes to CPU and they sent this (for Asus Strix B650E-F Gaming Wifi) :
- B650E-F CPU USBs.png (172.37 KiB) Viewed 7959 times
Re: USB LATENCY ANALYZER V2
Posted: 12 Dec 2025, 23:13
by Watchdog
vnb wrote: ↑12 Dec 2025, 21:10
Watchdog wrote: ↑12 Dec 2025, 15:41
Someone created a powershell script that tests and checks if you are using the lowest latency USB controller of your PC. On my MOBO which is ASUS ROG STRIX B650E-F it has two USB 3.2 Type A Gen 2 ports. So I plugged my Wooting 80HE and my mouse on those two USB ports, upon checking it with the latency analyzer it shows that only one USB is working as it should. Any idea why?
https://imgur.com/a/HarVShc
i got you mate. Asus Support provided this to me a while ago. I asked them for a graphic with annotations of which USBs goes to CPU and they sent this (for Asus Strix B650E-F Gaming Wifi) :
B650E-F CPU USBs.png
Thank you. You're the best man.
Re: USB LATENCY ANALYZER V2
Posted: 13 Dec 2025, 09:58
by kyube
Watchdog wrote: ↑12 Dec 2025, 15:41
Someone created a powershell script that tests and checks if you are using the lowest latency USB controller of your PC. On my MOBO which is ASUS ROG STRIX B650E-F it has two USB 3.2 Type A Gen 2 ports. So I plugged my Wooting 80HE and my mouse on those two USB ports, upon checking it with the latency analyzer it shows that only one USB is working as it should. Any idea why?
https://imgur.com/a/HarVShc
All of these CPU vs PCH routed USB ports topics are trivial & frankly ridiculous to discuss.
We're talking about a <1000ns (<1µs) difference in routing between CPU vs PCH.
Chasing USB driver DPC & ISR performance are far more fruitful than this topic.
Re: USB LATENCY ANALYZER V2
Posted: 13 Dec 2025, 10:33
by hot_coffee
kyube wrote: ↑13 Dec 2025, 09:58
Watchdog wrote: ↑12 Dec 2025, 15:41
Someone created a powershell script that tests and checks if you are using the lowest latency USB controller of your PC. On my MOBO which is ASUS ROG STRIX B650E-F it has two USB 3.2 Type A Gen 2 ports. So I plugged my Wooting 80HE and my mouse on those two USB ports, upon checking it with the latency analyzer it shows that only one USB is working as it should. Any idea why?
https://imgur.com/a/HarVShc
All of these CPU vs PCH routed USB ports topics are trivial & frankly ridiculous to discuss.
We're talking about a <1000ns (<1µs) difference in routing between CPU vs PCH.
Chasing USB driver DPC & ISR performance are far more fruitful than this topic.
I have to disagree, it is noticable. The number may be small in theory, but if you are actually playing aim trainers and can archieve top scores, you can notice the difference immidiatly. And it is such an easy improvement by just plugging the mouse into the correct USB port instead of chasing driver latencies.
Re: USB LATENCY ANALYZER V2
Posted: 13 Dec 2025, 12:03
by kyube
hot_coffee wrote: ↑13 Dec 2025, 10:33
I have to disagree, it is noticable. The number may be small in theory, but if you are actually playing aim trainers and can archieve top scores, you can notice the difference immidiatly. And it is such an easy improvement by just plugging the mouse into the correct USB port instead of chasing driver latencies.
Human bias based on the plentiful of ignorant claims about certain settings purported online can do wonders to "boost scores" as well
Psychological & physiological effects play a much larger role than you & many other users around here think.
Re: USB LATENCY ANALYZER V2
Posted: 13 Dec 2025, 13:31
by hot_coffee
kyube wrote: ↑13 Dec 2025, 12:03
hot_coffee wrote: ↑13 Dec 2025, 10:33
I have to disagree, it is noticable. The number may be small in theory, but if you are actually playing aim trainers and can archieve top scores, you can notice the difference immidiatly. And it is such an easy improvement by just plugging the mouse into the correct USB port instead of chasing driver latencies.
Human bias based on the plentiful of ignorant claims about certain settings purported online can do wonders to "boost scores" as well
Psychological & physiological effects play a much larger role than you & many other users around here think.
Lmao just because you can't feel a difference, it doesn't mean others can't. Not sure if this is just ragebait or you are seriously this ignorant, every latency guide mentions this trick and that's for a reason. It seems to be a skill issue on your end.
Re: USB LATENCY ANALYZER V2
Posted: 13 Dec 2025, 13:59
by Slender
kyube, if I perform an action after which I see the value 1 in the program, and I see the value 0 after I reverse the action, can I trust that program?