The FX 5700 Ultra halves some parameters of the FX 5950 Ultra (except the vertex shader). It means that the FX 5900 clocked at 400 MHz against 475 MHz will be stronger than the 5700 Ultra. Plus the 256-bit bus. The 5900 XT coupled with 700 MHz memory and such bus will beat the the FX 5700U with its 900 MHz memory and 128-bit bus. Also remember that almost all FX 5900XT/LX/SE are able to raise their clock speed up to the level of the FX 5900 Ultra



Link: Digit-Life