SWARM with low spec systems - hurt or help?

Hello, I build a lot of lighting using a SWARM farm and I was curious about adding more systems and how it affects the bake.

Currently I have about 15x 8 core systems with mostly 16GB of RAM on my SWARM network. (our game developer boxes which I use to SWARM after hours).

I have about a dozen more dual core cpu’s with 4GB of RAM sitting around and gathering dust. I’ve noticed that on my 3 boxes that are using 8GB of ram, they are the last to finish SWARM.

So my question is this: Will it help or hurt SWARM bake times by adding the dual core systems to the SWARM farm?