Has any one got any experience in rending on more than 1 pc at a time in vue i am using 2 pcs of following specs  win xp 3GHz dual core 3GB ram and the other win vista 2.2GHz quad core with 4 GB ram. when rendering to disk with them both working on the same pic the dual core is about 30% fater than the quad (judged by the number of tiles each has done ) by current render at 51% done has 1365 vs 916 tiles completed. is it just that the faster dual core is just better ? is it because one is in vista  the other in xp or is it anything to do with the pc that was used to start the image and this is the one that it is being rendered to (the xp one ) any advice or information would be most welcome