Just in case you need a reason to be insanely jealous of someone, [H]ard|OCP has just published an article covering what it is like to be living with two GTX 980's in SLI.  The cards are driving three Dell U2410 24" 1920×1200 displays for a relatively odd resolution of 3600×1920 but apart from an issue with the GeForce Experience software suite the cards have no trouble displaying to all three monitors.  In their testing of Borderlands games they definitely noticed when PhysX was turned on, though like others [H] wishes that PhysX would abandon its proprietary roots.  When compared to the Radeon R9 290X CrossFire system the performance is very similar but when you look at heat, power and noise produced the 980's are the clear winner.  Keep in mind a good 290X is just over $300 while the least expensive GTX 980 will run you over $550.

"What do you get when you take two NVIDIA GeForce GTX 980 video cards, configure those for SLI, and set those at your feet for four weeks? We give our thoughts and opinions about actually using these GPUs in our own system for four weeks with focus on performance, sound profile, and heat generated by these cards."

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

Graphics Cards