ExtremeTech took a look at the Dell XPS M1730 notebook with Penryn CPU and GeForce 8800M GTX:
With a Core 2 Extreme X9000 mobile CPU running at 2.8GHz, a pair of GeForce 8800M GTX cards in SLI, and two 200GB 7200 RPM drives in RAID 0 configuration, it's no surprise that this $4500 monster is fast. Way fast. It's easily the fastest notebook computer we've tested yet. That kind of speed comes with some compromises, of course. The cost is steep, naturally, and the battery life is…well, it's meant to be plugged in all the time. If you're in the market for a high-end desktop replacement notebook, portability and cost are the first things out the window. Let's take a deeper look at Dell's new offering.
Check it out over here. The reviewer claims this is the fastest desktop replacement notebook he has ever tested and rated it 9 out of 10. The biggest disadvantages are the very high price tag and the heavy weight.