They have posted a chart which compares the Quadro FX 4400 with the Quadro FX 4500 and it shows an impressive performance enhancement.
We have to make this abundantly clear these are not SLI results! But from a single Quadro FX 4500 and FX 4400 only! It is without doubt; that these preliminary results are really going to shake up the community.
Source: 3D Professor