i want to order a new graphic card to get faster render and to get bigger scenes in my vram. I looked around at the actual gpu-market and found an interesting comparison between the latest cards at a CUDA PMC benchmark, its only in german but if you just focus on the pictures i hope you can understand what i want to explain:
http://www.tomshardware.de/geforce-gtx- ... 92-22.html
In most cases of the first three tests the "old" gtx 580 is relatively close the the gtx titan but it only costs a third (about ~300 €)! A negative point to the gtx 580 is, it has only 1.5GB of VRam

But how do you think about that?
Actually i am using a gtx 470, do you think it would be a big upgrad for me?