[Bf-cycles] cycles, some questions about GPU

[Sebastian Röthlisberger]

On 16.11.2011, at 16:12, Jordan Miller wrote:

> is there anywhere to demo Nvidia graphics cards? I'm imagining
> installing Blender with cycles on demo machines and checking out
> performance on test scenes. I did this a couple weeks ago at the apple
> store and it was NOT significantly faster than my laptop from a couple
> years ago. I'll definitely be steering clear of Mac desktops (even 8
> core) for Blender Cycles for the time being.
> 

Thats one of the reasons why i build a hackintosh ;-)

> for GPUs, GFLOPS is calculated with a very specialized highly parallel
> algorithm written from scratch and directly for GPUs. so it is NOT
> akin to clock speed on a CPU in terms of a ballpark performance
> metric. it does not always achieve that rate, and IIRC, it can never
> achieve that rate for things like CUDA or OpenCL etc.
> 

Ok, thanks.

> I think you want the fastest one with the most memory and the most CUDA cores.
> 

Yes of course, i will. ;-) just a matter of money. 


> jordan
> 
> 
> 
> On Nov 16, 2011, at 10:03 AM, Sebastian Röthlisberger <lalli at gmx.net> wrote:
> 
>> 
>> On 16.11.2011, at 15:35, Brecht Van Lommel wrote:
>> 
>>>> 2011/11/16 Sebastian Röthlisberger <lalli at gmx.net>:
>>>> "will be limited by the max amount memory of 1 GPU" until the "bigger scene
>>>> than memory" feature is added?
>>> 
>>> Right, multi GPU wouldn't help in increasing the memory available.
>>> 
>>>> about 2. GFLOPS.
>>>> afaik GFLOPS is not a single feature but (wiki) Floating Point Operations
>>>> Per Second.
>>> 
>>> What I mean is, it's not possible to say, look for X or Y in the GPU
>>> specs, this will ensure good rendering performance. It's much more
>>> complicated than that, but more flops is of course better.
>> 
>> Ok, i thought GFLOPS are something like the "result" of the GPU specs.
>> 
>>> 
>>> Brecht.
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