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How to select a secondary GPU for dual GPU setup :

Pre-requisites​

  • Read the Dual GPU Guide/Overview if not read already.
  • Check PSU capacity by selecting your components on PC Part Picker Website and use the SPL's PSU Tier List if you want to buy a new one.
  • Check your PCIe slot bandwidth/speeds by referring to your motherboard manual. It should be enough for your resolution and framerates/refresh rate of the monitor. Refer this PCIe Guide for more info.
  • Check if your PC case has enough space for two GPUs (based on the GPU's model - height).

Selection :​

  • Confirm your monitor resolution (and the game's resolution, if playing on lower resolution than monitor in windowed/borderless mode).
  • Decide an average base FPS over which FG has to be applied.
  • Refer to the Second GPU Max LSFG Capability Spreadsheet - the base FPS decided earlier should be around half of the values in the sheet .Factor in around 25% lower performance (fps) for HDR, if applicable.
  • Preference: AMD>Nvidia=Intel (not a hard and fast rule).

Ask in the dual GPU channel/sub-reddit page/steam community for more help, after going through this.