Having had a 1000 watt power supply and an MSI Radeon R9 390 laying around about 18 months waiting for a new build, I finally did something with them. I am not willing to pay the price of my dream machine, so I compromised. I found an old Dell Precision Workstation 390 that would not boot, had a Core 2 Duo @1.86 GHz, only 1 GB of RAM, no hard drive, and an ancient Quadro video card. The Dell had last run Windows XP Pro. It would not get past BIOS with a hard drive installed.
I got it running and upgraded the CPU to an Intel Core 2 Quad Q6700 @ 2.66 Ghz . Then I installed a Dell heatpipe heatsink, 8 GB PC-6300 RAM, two hard drives, two video cards. and the OCZ 1000 watt power supply. I still have a batch of additional power cables left! I removed the DVD/CD drive and the case structure for those items. I installed Windows 10 Pro ($2.48 on eBay). Putting the side on this case is impossible, so I removed the front of the case, too. The latest photo of this (jury)rig is shown on my Facebook page
. There are other photos of it during development in my photos. Both video cards started running Folding@home about ten hours ago. I spent about fifty bucks on this machine (less the power supply and video cards). Not bad!
The video card inside the case is a Sapphire Toxic R9 290X and the MSI R9 390 would not fit inside the case at all, so I have it on a PCIe X8 slot with an adapter cable to x16 with an extender cable added. I taped the back of the 390 to the top of an old Dell case that is taped to my computer desk for stability. Don't laugh, it works.
I expect about 400,000 points or more daily. I will know more in a few days