Intel has updated the Arc A Series Quick Start Guide.
Intel Arc A-series desktop graphics cards are said to require Resizable BAR (also known as Re-Size BAR / Smart Access Memory / Clever Access Memory) to be enabled for optimal performance.As of June 15, 2022supported only Intel 12th, 11th and 10th generation systems.
this timeIntelNewly supports AMD Ryzen 3000 series (excluding 3000G series), Ryzen 5000 series and AMD 500 series chipset motherboards.
Intel Arc A Series Gravo Resizable BAR Support System
As of August 2022, Intel 10th generation or later, Ryzen 3000 series / AMD 500 series or later are said to be able to achieve optimal performance with Arc A series graphics.
As an aside below, it is necessary to enable Resizable BAR for optimal performance.It works even if disabled.(Also works on systems not listed above) However, if Resizable BAR is disabled, performance may not be fully demonstrated.
For example, when playing Battlefield V on Arc A380,
Arc A380 – BFV: Re-BAR Off 42.2 fps / On 59.4 fps[Source:TPU］
The difference is Avg 42.2 fps with Resizable BAR off and Avg 59.4 fps with it on.
