From looking at the results, as long as you are not GPU bound, it seems as though the 337.50 drivers do offer some upside in most of the games tested. *Star Swarm* sees a 25% boost on the GTX 770 and the GTX 780 Ti is closer to 30%, exceeding the up to 21% stated on the release notes. In *BF4* the single card gains were minimal, as were the gains at 5760x1080. However when you run the SLI numbers at 1920x1080 you get an easy 5% to 6% boost. *Metro: Last Light*, much like *BF4*, shows minimal gains at 5760x1080, but shows promise in both the single and SLI testing at 1920x1080, with gains as high as 8%. The greatest performance boost in *Batman: Arkham Origins* bucked the trend of being GPU bound with a pair of GTX 780 Ti in SLI by bringing home a 10% boost in performance. *Far Cry 3* shows gains in almost every test; the largest gains coming from the SLI configurations at 1920x1080 with the GTX 770s delivering a 7% boost and the GTX 780 Tis delivering a 4% boost using the new driver."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips