4 GPUs: TITAN or GTX 690?

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UsedName
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Hey everyone, I recently bought Octane and found that I'm in need for a new rig. My question to you is:

If I were to buy 4 GPUs and use them simultaneously, and money wasn't an issue, would I be better off buying 4 GTX 690s or 4 TITANs?

I've read that the 690 has more cores, but for some reason many people say the TITAN is better... So what's your opinion?
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glimpse
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Without any question - Titans. These have different chip, more vram - so in the end these are much more future proof for this reason alone & You still have 4 GPus instead of 8.

Cheers
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voon
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Are 690s or any dual chip supported? Isn't that internally SLIed and SLI doesn't work with Octane? I recall having read soemthing somewhere, but maybe I'm blabbering. Would like osmeone to enlighten me :)
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glimpse
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voon wrote:Are 690s or any dual chip supported? Isn't that internally SLIed and SLI doesn't work with Octane?
590, 690 - Dual GPU cards are suported. For Octane You don't need sli, so You just disable this in windows. Octane will see 2GPU if You have dual card.

Again, scene should fit in every GPU Titan is 6gb when 690 is two GPUs with 2GB each - render speed is very similar. So for the ~the same price Titan is way better choise.
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