Hi there

I've i7-920 currently overclock'd at 4.4GHz still on air and i'm pretty happy with render performance,I've used few times Octane,but my GPU is slow for this and I will need to upgarde if I would want to use 

Seems best GPU for Octane is GTX780,GTX970 or GTX980 are slower than 780Ti,but in LuxRender GTX780 is poor and on other hand 970/980 are fast as AMD R9290X

Is yours CPU overclock'd,if not,then I would overclock,you will gain a lot with overclocking,I've lowered my render times to very nice,but this really depends on more factors 

Agree i7-5960x is awesome,but price is out of reach for me and looking like i7-4770k or 5930k is CPU which I'm looking to get,but those CPU are not so overclockable such as older 2600k or 920

I would wait one more year,DDR4 RAM are still very expensive and new motherboards are too very expensive,as I said I would overclock yours CPU,what cooling are you using ?

Thanks,Jura