We've been testing 1 Titan vs. 3 and so far, the speed increase of the
triple-Titan box is holding at about 2.45x. In an email exchange (or
maybe it was on the forums, can't recall) it was mentioned that on the
topic parallelization, Pixar had determined that even for them, 4 units
together (of whatever, not necessarily Titans) was the max they could
really go before it started to cost more money than it was worth. In our
case, I'm thinking 3 might be our max, based on some nerdy mathematics
by one of our IT guys analyzing render times per shot, per frame,
hardware/software costs, rack space used, etc.
But hey, Redshift aside, the Titan in my workstation is doing wonders
for my viewport performance in Soft. I had a 58M, 2500-item model
derived from a CAD file the other day, and this thing was letting me
tumble around it at ~15fps in Shaded mode. That ain't shabby!
-Tim
On 1/9/2014 6:11 AM, Paul Griswold wrote:
There was a discussion on the RS forums about it. I don't recall the
numbers, though. I don't think the speed of the PCIe slot made a huge
difference. It's really all about the speed of the card.
Also, although it doesn't load the entire scene into your card's
memory, the more memory your card has, the better it is.
But overall, for the type of work I'm mainly doing these days, it's
extremely fast. In fact, it's so fast that I was finding the
bottleneck was the time taken to export the mesh to Redshift, not
rendering. Redshift has a proxy system like Vray & Arnold, but you
have to manually create proxies per object & my scene had hundreds and
hundreds of objects, so I didn't have time to create them. Therefore,
it was creating a renderable mesh per frame - so on a frame that took
28 seconds to render, 20 seconds was spent exporting the mesh and 8
seconds were spent on rendering. But again, it's a beta and they're
continuing to improve things like the proxy system.
Once I'm caught up I'm hoping to try rendering the classroom scene and
see how it does.
-Paul
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