Resizable BAR (ReBAR) is disabled by default because many older or poorly optimized games can suffer performance issues when it’s turned on. Enabling ReBAR in your BIOS simply gives compatible titles permission to use it those games that have been tested and shown to benefit from ReBAR will automatically take advantage of the feature for a performance boost.
Thats correct. Simply force enabling it will degrade performance in some games otehr games enable it during start up. Jay just likes shitting on nVidia and Intel meanwhile using those products. . .