Or at least silent compared to the standard Cherry MX Red switch it's based on. The switch has the same linear feel as standard MX Reds, but with "patent-pending noise reduction technology." These aren't just your standard O-rings either--this silencing tech is built right into the switch itself. Presumably, Cherry and Corsair needed to build an integrated solution because O-rings would've blocked some of the RGB lighting.
You'll pay for ear comfort, though--the switch is currently exclusive to Corsair's Strafe RGB Silent, which will retail for $160 when it launches in October. There's also a non-silent Strafe RGB (MX Red or MX Brown switches) set to launch simultaneously for $150. Both keyboards feature USB pass-through, full 16.8 million color lighting (for real this time, unlike the K70/K90), a detachable wrist rest, and media controls, plus a white backplate to reflect more light and make the Strafe's colors pop a bit more.
I asked Corsair whether they plan to make a Silent RGB K70 or K90, but Corsair demurred.
The next step is to convince your spouse/coworker/roommate to use the RGB Silent switch. After all, you've heard the old saying: You can lead a Cherry MX Blue user to a quieter mechanical switch, but you can pry my clackety-clacking Blues from my cold, dead hands.