Bright Side of News brings the clockspeeds of NVIDIA's GT300, take it with a grain of salt though:
According to the German site Hardware-Infos, the sample boards now come with a higher GPU clock. The alleged GT300 A1 silicon ticks at 0.7 GHz, with 512 cores working at 1.6 GHz. GDDR5 memory was upped to 1.1 GHz QDR or 4.4 GT/s [billion transfers per second], resulting in memory bandwidth of massive 281.6 GB/s. According to information we had, nVidia firstly clocked the at 1:1 ratio with GeForce GTX280 for a baseline comparison. If the leaked informationis true and those clocks remain final, that would mean GTX380 missed it targeted clock by a double-digit percentage. Still, a beast nevertheless.
If the figure of 1.6 GHz for 512 shaders is final, then the chip can achieve 2457 GFLOPS, e.g. 2.46 TFLOPS. This is a very good jump from 933 GFLOPS on the original GTX280.