Just a quick follow up to the system I built up last week. Dell T3400 core2 duo (2 core) 266ghz shell, no hard drive memory or video card. $10 I installed a core 2 quad ( 4 cores) 283ghz $20 to my door, 6 gigs memory $52 and a msi R7 370 video card $150. The video card was one area where I knew I went overboard but I was trying to future proof, in case I wanted to do this again with an updated system. You could easy spend under a $100 and it would do just fine. I already had a hard drive laying around so no cost. Win 7 install $25 free upgrade to 10 was installed. At this point I was done. Total $257. Average time spent for a work unit on the cpu 2.5 to 3 hours X 4. The gpu takes about 18 to 20 mins. Heat, 158F across the cores at full load. To hot, so I removed the side panel that reduced it by 10F, still to hot for 24/7 running. I did some research and found Dell made 3 heat sinks for this model, alum which is what i had and copper for the others. I found a copper for $13 and now it's running 118F across the cores with the side panel on. Total $270. I also installed a 500 watt power supply $50 even though the 375 watt original was working fine I became concerned about the video card under voting so I'm not adding the price to the total. This build was a lot of fun and for me well worth what I spent. It's been over ten years since I've put together a pc system, I'm a Apple guy. I know some will scoff at money wasted but I'll have months of fun tweaking and playing with it along with running seti.