For ComfyUI Cumfartniggers having problems with (v)ram management since the very recent updates, don't pass "--fast" without any arguments anymore, this update fucked it
https://github.com/comfyanonymous/ComfyUI/commit/e2d1e5dad98dbbcf505703ea8663f20101e6570a

With no arguments all "--fast" optimizations are enabled, which are:

>Fp16Accumulation = "fp16_accumulation"
>Fp8MatrixMultiplication = "fp8_matrix_mult"
>CublasOps = "cublas_ops"
And the new trash one
>AutoTune = "autotune"

So now pass the above strings as arguments for --fast or don't use --fast at all, in my experience the 20% faster fp16 accumulation is not worth the quality degradation for example.