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Ok so I have 3 x Titan's, all of which I know work and function correctly (I went into the nvidia control panel and forced octane to use each one individually as a test). The problem is it refuses to see/use all 3 of them, only 2 will ever get used. I've tried every driver from the nvidia site, along with a combination of other gpu's (980, 780ti etc) in place of the titans just to make sure it wasn't the cards themselves, but nothing is working. I'm seriously at a loss :/ please help!
i7-3930k
ASUS P9X79WS motherboard
32 gig ram
1250 watt psu
2 x 256g Samsung EVO SSD

did you disable sli?
tried a titan in a different slot? swapped titans' and slots?
what does device manager->display adapter, say?
any luck with newer versions of octane?

All very good questions. I don't have sli enabled but I did try that to see if I could "force" octane to use them all but no luck. I tried every combination I can think of in each slot thinking that was also the case and that didn't help. I even tried different slots at different speeds (x8,x16,x4 etc) and that did nothing. The device manager shows everything working just fine as well. I'll attach a screen shot of that too. Also, I tried the newest version of octane and nothing changed for that either. I'm wondering if octane is the culprit or if there's something else altogether going on.

Strange one... a wild guess here but do you have sufficient aux power? Could be a cable / connection issue. Windows / Nvidia CP would still see the card because the 75w it gets from the PCIe slot is enough. But Octane may do some power test before recognizing a card - not sure.

If power is not the issue I'd suggest asking the devs for assistance since there seems to be very few issues with multi-card setups.

Please keep us posted.

Best,
Seeker

That's a good thought, but im not entirely sure how I can go about testing to see if that's the issue? I should have plenty of power with a 1250 gold rated psu. I know I can make any 2 work together, just not all 3 at once.

yea weird...maybe something in the BIOS needs a "enabled" tick?

i just checked and the mainboard supports quad sli with geforce cards, so that should be ok.
Try resetting bios with the button on the side panel IO
also are all the connectors properly plugged in for all the power?
see ss.

also what does the tpu-do?

A second microprocessor, dedicated for automatic system tuning, is embedded in the ASUS P9X79 Pro called TPU. With a flick of a switch, the system automatically adjusts settings to an overclocked and stable state. This feature is also accessible in software mode through ASUS TurboV EVO easy overclocking tool for a single-click auto-system level up. The TPU not only allows a finer configuration of voltage control beyond the ability of any existing controllers, the real-time detection of the exact voltage reading are also made available through it. This is especially essential for overclocking purposes, ensuring the added on voltage can be minimized, whether it is for manual or automatic overclocking purposes. The TPU is connected to both the SMBUS and the CPU directly, to control the behavior of the rest of the system.

last one: try booting up with 0 cards, then with 1, then 2, then 3.

also I see your using cuda 7.0 toolkit

try 6.5 !

Thanks for the info wheresmy, I tried enabling the TPU and I also tried monitoring the power through the ASUS TurboV but it will only recognize asus gpus. I'm attempting the 6.5 toolkit but I tried that earlier with some other cards and it didn't seem to help. I'll give it a try with this setup and see if it triggers something.

abstractmedia wrote:Thanks for the info wheresmy, I tried enabling the TPU and I also tried monitoring the power through the ASUS TurboV but it will only recognize asus gpus. I'm attempting the 6.5 toolkit but I tried that earlier with some other cards and it didn't seem to help. I'll give it a try with this setup and see if it triggers something.

Yes, that's a weird issue. By the way, you don't have to install any toolkits, the CUDA driver is provided by the NVIDIA graphics driver. Maybe try a clean reinstall the NVIDIA driver (maybe version 347.52 or 344.75)?

Ya the 6.5 toolkit didn't work either. I've tried a ton of drivers including 347.52, 347.25, 347.09 and 345.20 but nothing. This is really one of the weirdest things we've ever seen here with the way it's acting. I would expect one of the cards to be dead or at least acting weird.