Careful...we have Dell 490's with NVIDIA Quadro FX 4600 video cards, on dual monitors and 32 bit OS. The 3gb switch has been a challenge.
Given the default setup we turned the 3 gb switch on and immediately our graphics became jumpy and slow. We experimented with various video drivers until we found one that works most of the time. Often the system will need to be rebooted 3 or 4 times to make the video work properly. Although other 490's will not work at all with the 3gb switch enabled.
Tony WE have successfully used the 3Gb switch in the past, on most of our machines it is added as a dual boot option so people can boot up without the switch enabled (don't ask for th tech deatils something IT setup) More recently we have exhausted the capability and moved to XP 64. I would advise test all your apps because some older bits of software don't work if they use DAO (database access). Some setup programs don't work but most 32 and 64 bit software installs without problems. Pro/e runs really well under XP 64. A large number of existing pCs can be upgraded toXP 64 bit eg Xeons with em64T. Ian Turner CAD Manager Flight Refuelling Ltd