Depends what your hardware is. What are you running, Cliffy? (As if I couldn't guess )
It's not about "acceptable," it's about whether you're running single, dual, or quad core, and how many chips your GPU has in it.
Multi-core CPUs can take advantage of the SMP (symmetric multi-processor) client, which GREATLY improves production over the single-core client. With a quad, you can even run two of them, if you really want to. GPU clients, meanwhile, will perform wonderfully on a single GPU, but if you have a dual-GPU rig, you can install two GPU Folding clients and dedicate one per core for massive points.
It's not about adequacy, it's about numbahs.