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So I'm thinking about getting a new keyboard soon and I really want a Corsair RGB keyboard but I want to know if they have PS/2 support. Also I would like to know what you think is better USB or PS/2. From what I hear PS/2 is better because it uses hardware interrupts to send keystrokes rather than polling then also USB can only handle up to 6 keys without special tricks. In thinking I'll try and find a keyboard with PS/2 unless dinnertime can convince me that ISB is good enough.

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Outside of extremely rare cases it doesn't matter which port you use these days. The performance difference shouldn't be noticeable (if there even is any) as long as the hardware isn't flawed/broken. 6-key roll over is usually more than enough, hard to even imagine a situation where you would want to push down more buttons at the same time. Many keyboards can do NKRO over USB, too.

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K70 RGB will not support PS2 because it does not support backlighting, certainly not RGB, I don't think it will even support media keys.

The K70 comes with n key roll-over on usb anyway. Not that most people would use it.

There isn't really an advantage to hardware interrupt afaik.

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