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Yes, the Speedlite 600EX-RT can sync with any shutter speed (according to the manual). However, when using high-speed sync, the maximum shutter speed on my Canon 60D is 1/250. You should check the max speed on your camera for high-speed sync.
(I think that 1DX cameras don't have a restriction like this - but I'm not sure.)
The 600EX-RT manual says on p25 - "With high-speed sync, the flash can synchronise with all shutter speeds." Any restriction on this will probably lie with your camera.
Your 60D flash sync of 1/250 is the maximum for non-HSS flashguns. When you select HSS in flash menu you can sync up to your maximum shutter speed of 1/8000th
|Canon Speedlite 600EX-RT Review - Hands On Review - Features of the Flash Body||Small | Large|
|Canon Speedlite 600EX-RT - Unboxing & First Look||Small | Large|