PCMark 2004
In PCMark 2004 the Venice is only a tick faster than the Winchester, but both get beaten by the Pentium 4 CPUs which have HyperThreading.
3DMark 2001
We see no difference between Venice and Winchester in 3DMark2001SE, but you can see how much difference a higher CPU clock makes here and that the P4 does not stand a chance against the Athlon64.