Lightmass Swarm Farm Growing

I picked up a used Dell Optiplex 790 SFF for $140 CDN to add to my UT4 Lightmass farm today.The machine came with an i5 2400, 4G of RAM (2x2G) and a 360G HDD. I added a another set of 2x2G RAM I had lying around to give it 8G total RAM. That's probably overkill, 1G per core or 4G in total should be plenty but since I already had the RAM anyhow, better safe than sorry.That gives me a 3rd machine with a little over 6100  passmark performance test cpu benchmark score to add to 6300 from my i5...