The issue is/was the "offical" drivers and software; not the "compatible" versions, but the "real deal" since Dell is selling the systems with 64 bit OS -- Dell has to support the 64 bit OS now.
(Added a link on driver list)
XPS 630i Intel Core² (Wolfdale) 3.0 GHz; BIOS: 1.0.13; 4 GB DDR2 @ 800 MHz;
Hard Drives: 320 GB, NCQ Western Digital; 640 GB, Seagate;
Optical Drives: 48x Combo CD-RW; 16x DVD+/-RW; Creative X-Fi PCI Sound;
Nvidia GeForce 9800 GT w/ 512 MB; 19 in 1 Media Reader w/ Bluetooth;
Windows 7, 64-Bit (Primary), c/b Vista 32-Bit, 32 Bit (OEM); 2.4/5 GHz Wireless 1505 PCIe WLAN
These are the "real deal". The 32-bit drivers are identical to the 64-bit drivers.
This is almost always the case with Vista drivers from any company.
The drivers don't change if they are separately listed under a "64-bit drivers" tab. 🙂