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Active: 1107 users

CPI and Mouse HZ

Forum Index > Tech Support
Post a Reply
kccc
Profile Joined April 2011
Canada32 Posts
July 08 2011 03:47 GMT
#1
I have a Steelseries Kinzu optical and wanted to get it as close to the Logitech mini optical settings. I was wondering if anyone knew if CPI = DPI in the kinzu configuration and if someone could explain mouse HZ for me? thanks
MiyaviTeddy
Profile Blog Joined October 2008
Canada697 Posts
July 08 2011 06:21 GMT
#2
CPI is indeed DPI. Counter per Inch = Dot per Inch. If you want it to be as close to the LMO, keep the DPI at 400dpi.

The mouse HZ thing is the polling rate.

"The polling rate (or report rate) determines how often the mouse sends information to your computer. Measured in Hz, this setting equates to lag time (in ms).
By default, the USB polling rate is set at 125hz."

Just set it to 500hz and you'll be fine.
Aiyeeeee
Lmui
Profile Joined November 2010
Canada6213 Posts
July 08 2011 06:52 GMT
#3
Default HZ is 125hz which translates to a poll every 8ms or 1/125th of a second. 500hz drops that to 2ms and 1000hz reduces that to 1ms. There's actually very little point in upping it to 500 as the 6ms really isn't needed in probably 99% of usage scenarios
mmp
Profile Blog Joined April 2009
United States2130 Posts
July 08 2011 08:31 GMT
#4
I read this as clocks per instruction, but I guess that's not the kind of performance you're interested in.
I (λ (foo) (and (<3 foo) ( T_T foo) (RAGE foo) )) Starcraft
kccc
Profile Joined April 2011
Canada32 Posts
July 09 2011 03:25 GMT
#5
how do they get such high sens if tthere dpi is 400? just ingame sensitivity?
MiyaviTeddy
Profile Blog Joined October 2008
Canada697 Posts
July 09 2011 04:30 GMT
#6
@Lmui:
From what I hear, 500hz is a hell lot smoother then 125hz.

@kccc

either high sensitivity or high DPI, depends really.
Aiyeeeee
Glockateer
Profile Joined June 2009
United States254 Posts
July 09 2011 04:31 GMT
#7
On July 09 2011 12:25 kccc wrote:
how do they get such high sens if tthere dpi is 400? just ingame sensitivity?

Hand speed.
GET SM4SHED
Xapti
Profile Joined April 2010
Canada2473 Posts
Last Edited: 2011-07-09 05:29:54
July 09 2011 04:40 GMT
#8
On July 09 2011 12:25 kccc wrote:
how do they get such high sens if tthere dpi is 400? just ingame sensitivity?

Sensitivity essentially is solely DPI/CPI, although user's screen resolution is a married factor that matters just as much as well.

The answer to your question is hence that "they" (who?) [/i]do not[/i] get high sensitivity at just 400 DPI.
However, if running an application at low resolution, 400 DPI should not be noticeably insensitive, since there's a limited number of pixels on the screen anyway.
For high resolution scenarios, a person may be stuck just having to use their arm around lots. That doesn't make it high sensitivity, but it is a way people can get by using a low sensitivity mouse.
Lastly, they can enable acceleration and/or pixel skipping. This enables less movement, but at least for the pixel skipping scenario will result in less accuracy (granted this isn't typically too much of an issue for most gaming, but it can be an issue for photo editing, adjusting windows, clicking on links in a web browser, etc.
On July 09 2011 13:30 MiyaviTeddy wrote:
@Lmui:
From what I hear, 500hz is a hell lot smoother then 125hz.

While I agree that 250Hz is better than 125Hz (but probably not very noticeable), I'd say it's just very mistaken for anyone to say that above 250Hz is in any way noticeable compared to 500 or 1000Hz. One needs to realize that monitors don't tend to ever refresh faster than around 120hz, and games often not more than 60-100Hz.
"Then he told me to tell you that he wouldn't piss on you if you were on fire" — "Well, you tell him that I said that I wouldn't piss on him if he was on Jeopardy!"
cristo1122
Profile Blog Joined November 2010
Australia505 Posts
July 09 2011 05:39 GMT
#9
the hertz has nothing to do with the monitor it has to do to the number of timese that the mouse talks to the computer higher hertz means a greater responsivity and thus specificity but as the hertz increases it requires higher system requirements.
ZvP imbalanced blizzards solution nerf terran
JingleHell
Profile Blog Joined March 2011
United States11308 Posts
July 09 2011 05:44 GMT
#10
On July 09 2011 14:39 cristo1122 wrote:
the hertz has nothing to do with the monitor it has to do to the number of timese that the mouse talks to the computer higher hertz means a greater responsivity and thus specificity but as the hertz increases it requires higher system requirements.


Monitors refresh rate is also measured in hz. (Cycles per second.) He's looking at it from a point of view that if your polling rate is faster than your monitors refresh rate, you won't see much input lag from the mouse. However, a reasonably faster polling rate will (likely) act similar to triple buffered frames for reducing input lag with Vsync, but only to a certain extent.

Sadly, this is pure guesswork, because it's all going to depend on the drivers and how well they interact with both your specific hardware, and the game itself.
zala2023
Profile Joined April 2011
United States228 Posts
July 09 2011 06:46 GMT
#11
I use a g9x that can go up to 1000Hz for the feedback rate
with that being said, I dont move my mouse at 50 miles per hour, so I set it at 500Hz and I dont feel any difference whats so ever (and I doubt you will feel any difference at 250 Hz)

While the higher the feedback frequency the better is true, for the most part, unless you are a super gosu with 500 apm microing individual marines, I doubt you will feel much of a difference, if any.
relax bro we got this
kccc
Profile Joined April 2011
Canada32 Posts
July 11 2011 03:30 GMT
#12
so LMO dpi is always set to 400? Your not allowed to cahnge it?
Lmui
Profile Joined November 2010
Canada6213 Posts
July 11 2011 05:16 GMT
#13
DPI is dependant on the mouse. The majority of budget mice (Ones without changable sensitivity) are usually 800 dpi. Some mice support changeable DPI but you have to understand the difference between DPI and sensitivity.

DPI is an absolute measure reported from your mouse (It can change depending on the surface but I'll ignore this.) It is however many discrete steps your mouse reports for every inch of travel in any direction. 800dpi means that the mouse will report 800 steps travelled per inch in any diretion.

Sensitivity is how the computer chooses to implement the report it gets from the mouse. (Using the format computer:mouse) 1:1 means that the computer will move the cursor (On a 2D surface) one pixel per step from the mouse. A 1:2 would mean that the computer would move the cursor one pixel for every 2 steps reported in a direction from the mouse. (A 3D world introduces quite a bit more complexity to this which I'd rather not get into.)

As for the frequency debate and what is noticeable and not:

The majority of monitors out there are 60hz. This is a new frame every 0.017 seconds. At 125hz (The default polling rate) There is up to an 8ms delay in reports which is 0.008 seconds. This can translate into the mouse response not being added to one frame by I'll call it 0.007 seconds giving 0.001 seconds for processing time. This'll mean you see the result of your mouse movement start about 0.026 seconds later than you'd expect which in all honesty isn't much. I'm ballparking numbers here based on my estimations but they should be pretty accurate.

I'm not sure how going from 125hz to 500hz will make the mouse movement smoother as it'll only update the mouse position visually 60 times per second on a regular monitor. I can understand how it'd affect a 120hz monitor though.

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