Having plenty of time and multiple graphics cards on hand, AnandTech has assembled a long series of tests comparing systems with multiple GPUs.  This article deals with pairing, there will be others dealing with triple and quad setups for those looking for even more power.  The key to using multiple graphics cards is how much better the performance gets when the second card is added.  Buying a full price second card that nets you an increase of 15% might get you bragging rights on the 3DMark website, but as an investment it really isn’t that sound.  Check out how these paired cards compare to each other in terms of pure performance as well as price to performance.

“MultiGPU solutions have been around for a few years now, and while we frequently include single card multiGPU solutions in our reviews, we only occasionally take an in depth look at multiGPU technology. Some time has passed since the last time we studied the issue, and now that we’ve fully broken in our Core i7 system, 64-bit Vista, and recent graphics drivers, it’s time to get to it.

Over the past few weeks we’ve been benchmarking and analyzing lots of numbers. We’ve looked at single, two, three and four GPU systems across multiple games and resolutions. The configurations we chose to look at are current generation high-ish end hardware capable of operation in 3-way and 4-way configurations. Because of the sheer volume of data we collected, we’ve decided to break up our analysis into multiple articles. “

Here are some more Graphics Card articles from around the web:

Click Here to go to Video Cards  Graphics Cards