@Samuelf111 If you're building a desktop, a 1650 Super should be more than sufficient, and a 1660 of any kind a bit of overkill, not that that's a bad thing. The cheapest Radeon 5000 or 6000 card you can find would also be more than fine.
A laptop with a 1060 should be able to run Sims 4 on ultra graphics settings though. It sounds like something else may be going on with your girlfriend's computer. Has she checked the internal temperatures while she plays? If the CPU is overheating and throttling, turning down graphics settings without capping fps would actually make things worse: the more draw calls per second the CPU receives, the higher its load. There are plenty of free monitoring apps you could use; I like hwinfo because it picks up everything and is very lightweight.
It's also possible that the game engine is the problem and not the hardware. Mods and custom content can make Sims 4 a lot more demanding, as can having a long-running save with many played households. I've seen such saves run poorly on much better hardware without coming close to maxing out that hardware because the game engine itself can't keep up.
An easy test would be to have your girlfriend play a new save in a clean user data folder, as in, move the entire Sims 4 folder out of Documents\Electronic Arts and let the game create a new one. (These folders can be swapped back and forth.) If a new save runs much better than the current ones, then you'll know the issue isn't really the laptop itself.
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I don't work for EA. I'm just trying to help fellow players with their games.
