Yeah, these are right. Pentium 4 would be the best system for it, and the faster the CPU, the faster rendering would be if you export an animation since this doesn't use the video card hardly.
The video card only matters when in the viewports (doesn't use much CPU)
I actually could test this. I had a Nvidia Geforce 2 mx400 and replaced it with a Radeon 9800 Pro I have now, and had it on same system for a while and no improvement in speed of rendering was given from the difference in speed of Video card. Though as soon as I changed the CPU, the speeds tripled if not quadroupled in rendering.
I hope this helps