Is Turboquant really a game changer?

I am currently utilizing qwen3.5 and Gemma 4 model.

Realized Gemma 4 requires 2x ram for same context length.

As far as I understand, what turbo quant gives is quantizing kv cache into about 4 bit and minimize the loses

But Q8 still not lose the context that much so isn't kv cache ram for qwen 3.5 q8 and Gemma 4 truboquant is the same?

Is turboquant also applicable in qwen's cache architecture? because as far as I know they didn't tested it in qwen3.5 style kv cache in their paper.

Just curious, I started to learn local LLM recently