Intel Arc Pro B70 32GB ($1,299) vs NVIDIA RTX 5090 ($6,500+) on Qwen3.8-27B: about 1/2 speed gen (1/3 speed prefill) for 1/5 price, after best setup

I got an Arc Pro B70 (32GB) last week for $1,299 direct from ASRock official store on Amazon (B65 is also 32GB but slower, and was only $100 cheaper at $1,199, so I "splurged"). Obviously I'd have wanted a 5090 for the s