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Gaming on mechanical keyboard via USB 2.0 versus USB 3.0/PS/2????

post #1 of 11
Thread Starter 
Is there an advantage on reaction times? My current CM Storm Quick Fire Pro only supports USB 2.0:
http://www.cmstorm.com/en/products/keyboards/quickfirepro/

Taken from the website:
"
Mechanical CHERRY MX switches
USB 2.0 full speed
NKRO in USB mode
Multimedia shortcuts
Windows key disabled in game mode
Partial Red LED backlight
Removable braided USB cable with cable routing
1000Hz / 1 ms Polling Rate"


even sometimes, it won't detect in BIOS which is annoying.

I have a steelseries 7g though, that I can run via PS/2, which I hear is the best for N-key rollover.

So what am I losing via USB 2.0 since reaction/response is everything is FPS gaming?
post #2 of 11
I am using a PS/2 model M built in 1988 with an active usb adapter (to provide the truckload higher power it requires) and I cannot detect even the slightest hint of latency in the keystrokes. I wouldn't worry about it personally.
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post #3 of 11
Nothing, they all work the same
post #4 of 11
Thread Starter 
Quote:
Originally Posted by willywill View Post

Nothing, they all work the same

it can't be exactly the same.....
post #5 of 11
Quote:
Originally Posted by XxAlbertoxX View Post

it can't be exactly the same.....
And why the hell not?

Fire it up, keyboard works. What more different do you want? The only difference is the shape of the plug, as far as your experience goes... you won't be able to tell the difference even if your brain is a supercomputer.
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post #6 of 11
The default latency of USB 2 keyboards is low enough for even the most timing-critical gaming actions... or any action a human can perform with a keyboard tongue.gif.

Choose a keyboard according to the other features. There isn't even any advantage gained by changing the USB polling rate, much less switching to ps/2.

As a side note, ps/2 isn't "better" for NKRO, it just doesn't work over USB on many keyboards. Some keyboards include a ps/2 adapter in case the default USB 6KRO isn't enough for you. N or high key rollover is possible over USB, but many manufacturers either don't know how to or don't wish to circumvent the USB standard 6, and thus include a PS/2 capable controller. That's specifically tied to how they produced those keyboards though- ps/2 is not better, and will offer no advantage on a keyboard that isn't designed to do NKRO over ps/2 adapters, and offers no perceivable advantage besides the improved rollover on the keyboards that do.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Masta Squidge View Post

And why the hell not?

Fire it up, keyboard works. What more different do you want? The only difference is the shape of the plug, as far as your experience goes... you won't be able to tell the difference even if your brain is a supercomputer.

Yes, but I do not care whether or not I am able to "tell the difference".

Humans are stupid, and there is a lot of things are eyes or ears cannot perceive - that simply does NOT mean there is NO difference, rather the fact that we CANNOT PERCEIVE the difference.

I am a competitive FPS gamer, so if USB 3.0 is faster for reaction/response times than USB 2.0 on the keyboard, whether I can or not perceive the different is trivial, because I will be statistically or factually slower than my USB 3.0 opponent.

Do you understand now?
post #8 of 11
USB 2.0 and 3.0 are the same, both allow up to like 9 key rollover(9KRO) or something like that

PS/2 allows for NKRO(unlimited key rollover)

Basically USB(whether 2.0 or 3.0) is more than fast enough to send keyboard commands to the CPU instantly for all intents and purposes, same with PS/2, the difference is commands via USB are interpreted by the processor as a stack of commands, so USB can stack up to 9 keys at once then the CPU runs them in order, PS/2 however sends it's commands as a direct hadware interrupt, forcing the CPU to enact the commands as soon as they are received, allowing for NKRO

Long story short, for best FPS response, get a USB to PS/2 adapter
Edited by RatPatrol01 - 5/20/13 at 4:01pm
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post #9 of 11
And that is where people seem to have a general misunderstanding.

Just because a particular port has a higher bandwidth, does not mean it is inherently faster.

USB 1 was capable of 2ms response times, any possible improvement over that would never have an impact in reality in this universe. I cannot seem to find information about what the clock speeds are for each of the three standards, and I would go so far as to say the polling rate of the keyboard has a FAR greater impact on response time than the connection type.
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post #10 of 11
Edited: Irelevent.
Edited by Darkshowdo - 5/20/13 at 4:20pm
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