Last year when AMD launched their brand new RX 6000 series graphics card, they also introduced the Smart Access Memory (SAM) technology, claiming that there will be an additional in-game performance boost when pairing the RX 6000 series graphics cards with AMD 5000 series processors. Then NVIDIA jumped out and responded that SAM is nothing new but an existing technology that relies on the basic attribute of PCI Express: Resizable BAR. NVIDIA graphics card users could also benefit from additional FPS boosts with some simple motherboard BIOS, graphic driver and VBIOS updates, and such upgrade is not limited to AMD or Intel CPUs.  Now everybody is talking about Resizable BAR, but what exactly is Resizable BAR?