indigo rendering performance vs vga tech specyfication

[kellyq]

Hi

I want to buy a new graphics card and I wonder what parameters are especially important for indigo renderer
I know that if I want to render with gpu memory of card is very important more=better, but what about ROP unit, SP, TMU ?
e.g on my old card when I render with GPU indigo shows me that I have 16 compute units (nvidia 9800GTX+), so it must be ROP units, right???
Please tell me -> more ROPs = better performance and faster render?

Thanks

[Juju]

it depends on the scenes you render
what CPU do you have, it might bottleneck a top GFX card

more ROP's doesn't necessarily equal more performance, at the moment it looks like nVidia 5xx class GFX cards are better than equvalent 6xx class GFX cards when it comes to CUDA. if you're looking at OpenCL use for rendering then the AMD 79xx class GFX cards will do well.

more memory on GFX cards may also help your renderings.

consider if you need to do only PT when rendering, if so GFX card acceleration will help. if not (you use BiDir or combine MLT with BiDir or PT) then CPU rendering is all that supports those rendering modes at the moment.

[Zom-B]

I have the feeling that each week somebody starts the same thread -.-'

But anyway,

the more the better as always... bla bla...
Regarding compute performance many websites use SmallLuxGPU to benchmark the GPUs raytracing performance.
That benchmark comes closest to what Indigo does!
http://www.anandtech.com/show/6359/the- ... -review/17

The Problem is that Indigos Hybrid approach is quite bottlenecked by the CPU <> GPU communication.
So a powerful GPU with a slow CPU will end up with your GPU not used to its full potential, same other way around.
A old PCIE connector on the mainboard can also be a bottleneck!

Also use fastbox splatting for GPU rendering, since its optimized to lower that bottleneck!

And no I can't tell you the best combination between CPU and GPU!

**EDIT*
totally missed JuJu's answer here... sorry -.-'

[kellyq]

OK
I don't want to start new topic so ask her.

I bought finally gtx285, and when I try to render with gpu I get driver errors or app crash or BSOD (drivers 306 WHQL), want to ask if somebody else has this problem and wich drivers I should install

please help
thx

[CTZn]

Hi kellyq, he drivers shipping on the GTX285 disk are probably down to date, Indigo relies on recent boards technology. I own a 260 and Indigo is running fine with drivers version 285.62. I expect more recent versions to be preferred.

[kellyq]

thx 285.62 drivers working fine