Local AI hardware spans 100x cost spectrum

The 100x price spread in local AI configurations proves that home-grown hardware setups have matured into a multi-tiered hobby, where software optimization and model selection are just as critical as raw compute. Used RTX 3090 GPUs remain the consumer sweet spot for local AI due to their 24GB VRAM and low entry price, while Blackwell clusters represent the extreme high-end, scaling local hobbyist workloads to enterprise levels. For agentic tasks, dense 27B models are preferred over 35B MoE models because dense architectures offer more consistent instruction-following and reasoning in multi-step agent loops.