The plain one works at reference clocks set at 732/1464/3800MHz and both cards will feature the reference cooler. The Superclocked version features a factory overclock and works at 797MHz for the GPU, 1594MHz for those 480 CUDA Cores and 3900MHz for 1280MB of GDDR5 memory paired up with a 320-bit memory interface.
Both cards will be bundled with EVGA's Precision OC software with GTX 570 skin, free limited edition EVGA gaming poster and 3DMark 11.The EVGA GTX 570 Superclocked card is curently listed with a lowest price set at €321,13, which is about €20 more than the EVGA reference clocked one.
You can find them listed here.
