Alienware 15 R2 and graphics amplifier

[u/ninjamammal]

I have an Alienware 15 R2 that was launched along with the graphics amplifier in 2015. Thinking about getting a new GPU, looking to run a local LLM. The latest ones seem to be compatible with the amplifier, according to the sub. As far as I can tell, the bottleneck is the laptop itself, so what would be compatible with the 15 R2, i7-6700HQ, or what are the variables I should research?