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I use Qwen 3.8 27b Q4 with 100k context (llama.cpp and the Mistral AI harness) on a 24 GB AMD Radeon 7900 XTX and it's been great. It can handle pretty much anything I throw at it and I can let it work indepedently overnight / over days on long tasks.
I have nearly the same setup, except OpenCode for the harness. I run 200k context for anything that doesn’t need vision, or 150k otherwise. Typically get about 30 t/s decode With MTP, starts at close to 800 t/s for prefill and drops to the 200s for a long context. I’d imagine higher decode speeds are possible with some tinkering, but I haven’t gotten around to it.
I get about 45 t/s after some tweaking, getting the thermals under control helped a lot; mainly by reducing the power consumption to 261 W (and downclocking a little bit).
What vision model do you use?
OpenCode recently got hacked and advises changing API keys fyi.
How much electricity does it burn? And how much does it cost to let it run overnight? I feel like this is the same problem that the companies have, its way too expensive to use it on a lots of things and it is way cheaper to use it on someone else's server..
It uses 261 W, probably more expensive than getting a 2nd Mistral subscription with the cost of power where I live (Belgium), but it will be free heat once I have solar panels and a battery.
Thank you, that is not as bad as I expected. 👍