ok, well a server is a completely different story, they utilize memory differently then a home computer. The amount of memory accesable is related to the bit power of the processor (eg 2^64 in the case of a 64-bit processor, or 16GB).
Your right, the crossfire isn't nessecarily better, nVidia's SLI technology is definatly better, but i do like the idea of the GPUs acting as a single unit in ATI's model, instead of controlling different aspects of your view.
Nvidia will have the upper hand on expansions from here on out though, the number of cards that can be connected is essentially limitless. As proved by Dell with their new XPS system connecting 4 of nVidia's bad boys linked together:
http://www.xbitlabs.com/news/video/d...105153500.html