HFT trading is so obviously time critical that I would be very, very surprised if time synchronization to the few ns level (e.g. GPS steered Rubidiums, availabl

HFT trading is so obviously time critical that I would be very, very surprised if time synchronization to the few ns level (e.g. GPS steered Rubidiums, available for a few $1000 per Rack/Network) wouldn't be standard feature on all computers involved in the timing critical end of the business already, someone please prove me wrong here...