Considering Buying Another RTX 3090 - Benefits?

Summary

Currently using dual RTX 3090s, and am happy with it. But never satisfied lol :) I know I've basically maxed out my single stream TPS. (140+ on standard benchmarks now). But I only have 48GB VRAM, So I can only do two concurrent requests @ 256k Context Length, anymore and my KV-Cache will cause OOM errors. So I am considering adding a 3rd RTX 3090, and putting the 3rd one in Pipeline Parallel with the other two. That way I don't lose performance due to bandwidth bottlenecks, but get more

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