This handy guide will show you how to enable Resizable BAR on your ASUS-powered PC. We know that DIY PC builders the world over are excited to gain access to these potential performance improvements. ASUS has been working with our industry partners to bring support for this feature to over 180 of our motherboards and to our custom versions of GeForce RTX 30-series graphics cards. The Resizable Base Address Register, also known as Resizable BAR, is an exciting feature of the PCI Express expansion bus standard that has the potential to deliver more performance to gamers in select titles.