8 x GTX Titan, but no speed boost?

[abstractmedia]

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

[glimpse]

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

[mib2berlin]

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.

[glimpse]

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

[mbetke]

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.

[gordonrobb]

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.

[whersmy]

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

^

[kurtjn]

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?

[mainframefx]

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.

[gueoct]

Which Expansion Box are you using?