OTOY Forums

Hey all, I recently went from using 2 titans directly from the mobo to 2 expansion boxes housing 4 titans each. However, Im not noticing any render speed increases at all over the 2 card set up. My comp is recognizing all of the cards running fine and I have each one checked off inside the maya plugin settings but it doesn't seem to be helping, any thoughts? I tried the expansion boxes on 2 comp set ups:

Dual Quad-core Zeon with 32 gig of ram
and
Single Core i7 with 32 gig of ram

sounded as a cruel joke. install GPUz & take a look how these cards work..what is the load when Octane is working.

Hi, I would try the Octane standalone version may it is a limitation/bug in the plugin.
The latest test with the Octane benchmark was with 4 GTX 590:

http://render.otoy.com/forum/viewtopic.php?f=25&t=28684

You should get the same performance with 4 Titan, or even more.

Cheers, mib.

p.s. if You running stanalone, Have You enabled all cards through properties? how much of them Octane "shows" under the render window? =)

How do other CUDA apps work? Like iRay or a demo from another renderer?
I recently upgraded from 2 to 4 Titans and had a 100% speed increase.

Going from 2 to 8 should just give you a 4 times boost - no doubt. So if you're not seeing that, then something is wrong. Easy to try in standalone though and see if it's a plugin issue, as advised.

p.s. if You running stanalone, Have You enabled all cards through properties? how much of them Octane "shows" under the render window? =)

^

Maybe disable SLI like Octane apparently requires us to do -if you haven't already done so.
Maybe you have to do this for each additional card?

Possibly the bandwidth of those expansion slots is to low and is limiting the cards. Splitting up a PCI-E 3.0 x 16 Lane in 2 8x or 4 4x Lanes should work just fine without much speed loss. Though if you are running 4 cards on a 2.0 x 16 Lane that could be the root of your problem.

Which Expansion Box are you using?