I was asked to show the specs of my computer(s), here you go...
My main computer is an AMD FX 8120 8 core, overclocked to 4.5Ghz from stock 3.1.Asus M5A97 motherboard, 16Gb DDR3 1600m memory, dual AMD 4670 graphics boards.  using Luxrender a simple scene, like a portrait will give good clean images in a few hours, complex and/or high resolution scenes have taken 2 days - rendering using the GPU's helps.
I also have 2 other computers that I can run as render slaves on large scenes, they are both...MSI 870S-C45 mobo, AMD Phenom X4 965BE o/c'd to 4.0Ghz, 8Gb DDR3 1333m Memory and single AMD 4800 graphics, all machines are watercooled (one is also used as my home theatre PC - HTPC).
Enjoy,
Abi.