Mac Pro 4.1 Dual Quad Core 2.26 16GB 1066 RAM Radeon HD 4780 4x WD 2TB HD Most items are second hand and upgrade has happened over a two year period. Apple GPU, boot SSD and OWC RAM were my big spends but added a lot of performance. Definitely best bang for buck has been the goal. Firmware and CPU upgrade to 5.1 Dual Hex Core 2.8 (eBay US$350). 40GB 1066 RAM (OWC US$350). Radeon HD 5870 1GB VRAM (2012 Apple US$500). Nvidia Quadro 4000 2GB VRAM (2015 US$180 eBay) powered by SATA. Samsung 1TB Boot Drive (US$450) via Velocity Solo x2 PCIe card (2015 product website US$100). Intel 240GB SSD (2014 US$200) connected through the Velocity PCIe card. Seagate Desktop 2TB SSHD (2015 retailer US$120). 4x USB 3.0 via Inateck PCIe card (2015 eBay US$10).