I'm not so sure of that.
High resfreshrate ESC, FL6A FAST PWM ESC
Up to 600Hz PPM input
http://www.flytron.com/multicopter-parts/178-fl.html
Servo 560Hz
Servo Frequency and Center Pulse Width Information
http://www.ronlund.com/rcheli/HELP_SERVO_PULSE.html
Using standard ESC's with high refresh rates
http://wiki.openpilot.org/display/Doc/TurboPWM+ESC's#TurboPWMESC's-Recommended%26nbsp%3BESCsettings