Galaxy has clocked the two GTS 250 circuits to 675MHz GPU and 1695MHz shader clock frequency. The GDDR3 memory is in turn clocked at 2000MHz and performance is estimated to land between GeForce GTX 260 and GTX 285 with 3DMark Vantage score of P13964.
So far there is no information on price or availability and to be brutally honest the card is an exciting concept but not really a viable product. Perhaps it can find a niche if Galaxy can price it right.