Fallout 4's new PS4 pro update has landed. As promised by Bethesda's blog, patch 1.14 (also known as 1.9) pushes the game to a native 1440p, adding in expanded draw distances and a higher grade god ray effect. It also improves frame-rates compared to a regular PS4, but we're still some way off a 30fps lock. However there's a twist: by using patches earlier than 1.14, and selecting PS4 Pro's boost mode option, it's possible to achieve smoother results than Bethesda's official patch - although all other Pro enhancements are obviously left off the table.
As luck would have it, we had another PS4 Pro in the Digital Foundry office without Fallout 4's Pro patch installed - specifically, patch 1.12. To be clear, this features no visual upgrades whatsoever, where draw distances, resolution and lighting are exactly as they were on base PS4 hardware. However, the frame-rate results are fascinating when compared to 1.14, and it turns out Fallout 4 does indeed run faster on boost mode without the latest patch installed. In our stress test on the Corvega rooftops for example, the dips to 23fps seen patch 1.14 are eliminated, leaving us with a clean 30fps line on patch 1.12 - provided boost mode is checked, of course.
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http://www.eurogamer.net/articles/digitalfoundry-2017-fallout-4-ps4-pro-patch-analysis