Skyrim CF scaling on R9 295X2 is not so good. But the 4GB should serve well for mods.
http://www.pcper.com/reviews/Graphics-Cards/AMD-Radeon-R9-295X2-8GB-Graphics-Card-Review/Skyrim
Watch Dogs plays very well on even a single R9 290X at 1600p . R9 295 X2 will chew through it
http://www.hardocp.com/article/2014/08/18/watch_dogs_performance_image_quality_review/5
http://www.hardocp.com/article/2014/08/18/watch_dogs_performance_image_quality_review/7#.VAlq6qOLWxg
btw the XDMA tech on R9 295X2 is much superior in frametimes than the older tech on 7970 CF.
http://www.pcper.com/reviews/Graphics-Cards/AMD-Radeon-R9-295X2-8GB-Graphics-Card-Review/Skyrim
Watch Dogs plays very well on even a single R9 290X at 1600p . R9 295 X2 will chew through it
http://www.hardocp.com/article/2014/08/18/watch_dogs_performance_image_quality_review/5
http://www.hardocp.com/article/2014/08/18/watch_dogs_performance_image_quality_review/7#.VAlq6qOLWxg
btw the XDMA tech on R9 295X2 is much superior in frametimes than the older tech on 7970 CF.