I always had good luck with dualGPU. Right now I am playing with my second Vega 64, and in the games where crossfire is supported, microstutter is barely present, and if you use freesync, its completely invisible.As someone who had multiple sli/crossfire systems I'm actually glad this died. The microstutter was SHIT and there was no way to avoid it. What is the point of getting 90+ fps when every few seconds it hitches. Plus even back then lots of games didn't support it.
8800gt SLI was fucking insane perf/dollar though.
We finally have the resolutions to demand higher power, the slower transistor market to make multiple GPU an appealing solution, and the tech (activesync) to fix the microstuttering, yet the whole industry has totally given up on it.