Single GTX TITAN or Dual GTX 780Ti

[aw1]

Kindly need help to decide which option to go for:
Single GTX TITAN or Dual GTX 780Ti?

TITAN has 2688 CUDA Cores and 6GB RAM and GTX780Ti has 2880 CUDA Cores and 3GB RAM
so my question is if i go for dual GTX780Ti, will octane use all the cores on both GTX780Ti cards? that is total 5760 CUDA Cores from dual cards?

really need this help to decide which way to go

Thanks in advance

[gordonrobb]

Yes, broadly speaking 2x780 will be over twice as fast, but with half the availabe VRAM.

[aw1]

Thanks for your reply

GTX690 has 3072 CUDA Cores and 4GB RAM I am thinking about buying GTX690 but there is little confusion here, GTX690 specs show that it has 4096 MB (2048 MB per GPU) GDDR5 so does that mean Octane will recognize just 2GB of RAM on it? or full 4GB will be available?

thanks

[lixai]

if it's dual GPU then always available ram will be half of what it says on the specs.

[aw1]

Oh i see... then GTX780Ti is the good option i guess

thanks guys

[lixai]

maybe you better wait for this
http://www.guru3d.com/news_story/6gb_ve ... anned.html

for me, i almost always use more than 3 gb (and even not all 3 gb are available on a 3gb card, a few hundred megs always gets lost or by the display, or any other reason)
i do complex exterior architectural scenes with many objects and textures.
If your work doesn't need complex scenes (studio shots of objects like jewerly, or any other single objects scene) than 3gb will get you there, but with more complex scenes (an also if you need big resolution renders, the bigger resolution, the more vram consumtion) you need more ram.

hope that helps a little.

[aw1]

Thanks for your help lixai..
Yes I think 3GB is not gonna work because my scenes are getting bigger and bigger every day, specially architecture stuff and outdoors. I hope GTX780Ti 6GB version pops up soon within this month or so

Thanks

[aw1]

GTX TITAN Black 6GB is out

[vipvip]

personaly, i own 2 x GTX 780 ti factory-overclocked, and im very satisfied with it: no power/heat problem ( 850 W alim ), 'human' price , noise reduced and 2.5x speed, compared to my old 2xGTX580 system...it's a very good compromise !
For the projects i currently work on, 3GB is enough but of course that's perhaps the only limitation ennoying, even if i didn't encountered many problems with it until now ( except with very large pictures rendering like A3+ 300dpi format )

[Tommes]

What happens if you want to render ultra hires images? Is it still working, only segmented, or isn't it working at all?

Tommes