3drendering

Hi, I have unused 2 years old 1stPlayer BLACK.SIR 450w power supply and recently, I'm quite active on making 3d stuff, so I thought I would use that power supply to build a dedicated renderer and make a render farm like environment with my other 2 pcs. but I wonder if I should use a GPU or not...

I'm about the buy used professional GPU for 3D Rendering. I've been stuck that two models I can't decide that which one is better? Quadro K4000 had driver support and 3GB GGDR5 192 Bit vram and 5800MHz memory clock and had 768 Pipelines(CUDA Cores). AMD Firepro V7900's driver support has ended...

I have a i7 4770 processor that I've been using basically for 3d applications. I know it is slower than today's latest cpu's but time is not a constraint for me in CPU rendering applications and it gets job done decently. Also I have been able to overclock it to 4023 MHz, not any noticeable...