GTX 580 or GTX 660 as a addon card?

[Witpapier]

I have a GTX 670 2 gig and feel the need for even faster rendering with Octane. Now i can get a GTX 580 3gb for about R2700.00 no warranty since its secondhand or a gtx 660 2gb for R2200.00. what would complement my current card the most when it comes to rendering? $1 = R8.80

[whersmy]

Power consumption...what PSU do you run? 580 uses more watts, and will be faster then a 660. But less ram in most cases; 1,5GB.

[Witpapier]

I have a 750 watt psu. the gtx 580 is the 3 gb version. I just wonder if either one of the two is gonna give me more bang for buck concerning Octane that spending R4800 for another gtx 670. If the gtx 580 is on par render wise with my 670 then its prop a better buy. but Im a bit leek on these things.

[mib2berlin]

The 580 is much faster as a 670 it is faster as a GTX 680!

http://render.otoy.com/forum/viewtopic. ... &start=120

4. post.

But you need ab bigger power supply or a second for the GTX 580.

Cheers, mib.