Crossfire
Crossfire
You're curious about the 3-Way AMD CrossFire tech. It's a feature that allows multiple monitors to share a single display output, enhancing multitasking and productivity. It's often found in high-end gaming PCs and some workstation builds.
It seems SLI might not be the best choice in the long run. Running three GPUs could really drain power, and you should consider how that affects your setup.
Crossfire is being discontinued by AMD. The top card you can still use with Crossfire is the Vega 64, and running it in crossfiring mode probably won’t improve performance over a single 2080 Super or 2080 Ti. SLI remains available from nVidia, but only for the 2070 Super and newer models (or 1070 and newer from earlier generations). It’s an upgrade, but support is dwindling as more developers stop including it.
It seems you're trying to figure out how to handle the 1660S situation. You might want to focus on getting the 1660 super later and upgrade it when needed. Giving your brother the 1660 super could be a good idea, especially since his RAM is quite low—possibly even below 1000MHz.