Once again I will be the bringer of news. I was just checking my emails and I happened to find an Alienware one advertising there QUAD SLI PC!!! (<- ) Wow that was so fast! It has an FX-60 with 4-Geforce 7900...
Dual channel only adds about 10% to the performance. I would put 1.25 Gb becase of the physical increase in memory. If you get Rightmark Memory Analyzer, you can change the timings so it will be faster!
This may not be news to some others, but I found the FIRST SLI laptop to actually be on sale.
AMD Turion ML-44
Nvidia nForce 4 SLI...