---
url: "https://www.reddit.com/r/Qwen_AI/comments/1wrujaj/help_me_plan_a_qwen_38_flash_next_install_on_a/"
title: Help me plan a Qwen 3.8 Flash Next install on a 5090 + 64gb DDR5 system
source_kind: reddit
subreddit: Qwen_AI
author: Sexyvette07
captured: "2026-10-08T18:01:42+00:00"
comment_tree: false
topics: [local-inference, qwen, strata]
summary: User seeks advice on running Qwen 3.8 Flash Next on a 5090 + 64GB system, tests various checkpoints and engines, and finds Strata achieves high token speeds with IQ3_S model.
status: ok
---

Hey everyone. So ive recently got my Qwen 3.8 27b stack running and tuned using ninfer. This is my daily driver, and will continue to be until 4.0 replaces it. I'm happy with it, but i'd still like to see what Qwen 3.8 Flash Next can do and see how that performs compared to ninfer + Qwen 3.8 27b. When I run into a problem that Qwen 3.8 27b can't solve with a couple loops, or with planning stages, or other things that require high levels of intelligence, i'd like to have the ability to give that a shot before going the cloud route. This is a very large model, as you all know, which is why I need the experience of Reddit to help plan this out. What checkpoint will fit into my combined 96gb memory, and what will perform the best? With this being a large MoE model, I think this is a good chance to test out Free Token and see what it can do, but im open to suggestions on the engine. My use cases are agentic coding (trying out both Open Code and Deepseek Harness to see which one works better for me), rendering within ComfyUI, game development with Godot, etc.
My question to you all is this: What is the optimal setup on my system to maximize the model within my hardware? What checkpoints should I use? What do I set KV to? Context? Which inference engine? If you have Flash Next working on a 5090 + 64gb system, please share your setup and help a brother out! What has worked for you and what hasn't? This is still pretty new to me, so i'm still learning, and would greatly appreciate some guidance. Thanks everyone!
Edit: Tried the RadixArk-Qwen3.8-Flash-Next-NVFP4 checkpoint with Free Token with PLE and Ngram offloaded to NVME. It fit, believe it or not. With it sitting and loaded, it was using 26gb/32gb VRAM and 51gb/64gb RAM. Was only able to get 8.75 tok/s. It's just not feasible on a 5090 system with only 64gb of RAM due to so much being offloaded to a Gen 4 NVME, so i'm moving to a GGUF to see how well that does.
Edit 2: Anyone with a single 5090 system (with a minimum of 64gb RAM) MUST try Strata! This shit is pure magic! After todays update, im getting 120 tok/s on xhigh thinking, 160 tok/s on low thinking, with a very healthy prefill on the IQ3_S model. The coding is actually noticeably better than 27b dense so I think I may make this my daily driver and only go back to Ninfer for the easy stuff since it is still faster.