I dont think it is accurate at all to say that Nvidia has regained the lead. Sure if you bench Quake over and over in different flavors.. But the majority of modern games are Considerably faster on the XT. Just look at the newley released max payne 2 as one example.
DH review with non standard benchmark levels shows the XT beating the 5700U even in UT2003 wih AA+AF. Which is something to consider with all these main stream reviews. Once you factor in DX9 or even modern games with heavy use of Any Pixel Shaders the XT takes a sizable lead in nearly every case.
There are a group of games that if you play exclusively the 5700U is the clear choice. Especially if your Games are primarily OpenGL.
Overam Mirage 4700
3.2ghz P4 HT
SIS 748FX Chipset 800mhz FSB
60Gig 7200RPM HD
Radeon 9600M Turbo 128 (400/250)
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