What do you mean by 'Setting the memory to "fast timings"'? The only runtime I can get working for my GPUs is llama.cpp, which I haven't seen anything like that in its argument set. My perusal of the options for vllm and sglang didn't suggest anything similar either before failing miserably.
I think they are referring to the AMD drivers on windows, under the overclocking section you can enable fast memory timings. Not sure if this sort of thing is exposed on linux.