- last post: 01.01.0001 12:00 AM PDT
HaloKing, please take a visit to the Nvidia certified hardware page. If you are unsure what makes for a good SLI powersupply, which it looks like you are, then this list will be invaluable. The last thing you want is a PS that can't keep up with your system.
Unless you have one of the more recent motherboards, there is usually something you must physically do to your motherboard to make it ready for SLI (on mine you have to flip around a special SLI chip to enable SLI mode). While we're talking about motherboards, usually your SLI-ready motherboard comes with the bridge that connects the two video cards once they are installed.
It would not hurt to uninstall your existing graphics card in Windows right before you shut down to install your new one. You should make sure you have the latest drivers to ensure a smooth SLI experience, otherwise you will likely run into problems. Have the latest Nvidia drivers sitting on your Desktop for when you boot back into Windows. Windows will tell you that it has found new hardware when you boot up. Cancel out of that screen (it'll pop up twice, naturally), then double click on the driver install EXE. Once it is done installing, you'll notice a little bubble pop up in your task bar that says something to the effect of, "This system is ready to take advantage of SLI." Click on it and it will take you to the Nvidia SLI settings page, where it's a matter of clicking on a little radio button to enable SLI.
Back before Nvidia updated their drivers, you had to be running the same video card BIOS on both cards. This isn't an issue nowadays, but I have no idea if this affects performance at all. This is something you could research on your own.