Not anymore. Not with hybrid offloading, where the GPU handles dense tensors and the CPU only runs the sparse MoEs. I’m running a 300B model on a single 3090, and its faster than I can read.
You just need to use the right framework, and the right model.
I’ll check that out - speed isn’t my biggest issue so much as coding performance… The qwen 3.5 model I was using can write code, but it’s… Meh? Like sometimes it doesn’t even compile.
I did try tweaking llama.cpp to do some cpu offloading and it does seem to allow for much larger contexts at a modest performance loss. I’ll check out larger models.
CPU offloading is too slow unless you use a hybrid MoE model, with the --n-cpu-moe parameter, specifically.
This only offloads “sparse” parts of the model to the CPU, which take up a lot of RAM but are very compute-lite to run. In practice, thats most of the size of modern MoE LLMs.
I’ve tried a few times but with only 8gig of vram it’s simply not worth it.
How much CPU RAM do you have?
64G. But CPU inference is painfully slow.
Not anymore. Not with hybrid offloading, where the GPU handles dense tensors and the CPU only runs the sparse MoEs. I’m running a 300B model on a single 3090, and its faster than I can read.
You just need to use the right framework, and the right model.
I’d suggest trying ik_llama.cpp and a MoE like one of these: https://huggingface.co/models?other=ik_llama.cpp&sort=modified&search=35B
And speculative decoding like DFlash or MTP (which you can also get specific models for).
EDIT: Wrong link.
I’ll check that out - speed isn’t my biggest issue so much as coding performance… The qwen 3.5 model I was using can write code, but it’s… Meh? Like sometimes it doesn’t even compile.
I did try tweaking llama.cpp to do some cpu offloading and it does seem to allow for much larger contexts at a modest performance loss. I’ll check out larger models.
CPU offloading is too slow unless you use a hybrid MoE model, with the --n-cpu-moe parameter, specifically.
This only offloads “sparse” parts of the model to the CPU, which take up a lot of RAM but are very compute-lite to run. In practice, thats most of the size of modern MoE LLMs.
Have you tried qwen3.5-9b? It’s pretty solid for its size.
Yeah, it’s “good for its size” but it’s just too flaky for me to use for any significant coding.
Yeah, I wouldn’t use it for coding. It’s a bit dumb unfortunately.