Hi MC Stryker
We did some testing here and discovered there is noticeably lower in-game performance, specifically in UE4.7.3 & 4.7.2, with a GTX 480 and GTX 980. (The specs I posted before were tested with a GTX 770 which is apparently unaffected.)
This has been reported as JIRA [UE-12040]. When this has been addressed for a future build of the engine this post will be updated.
Thank you for your feedback!