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[TWITCH] NVIDIA unveils the Titan Z - Page 61  

post #601 of 747
Quote:
Originally Posted by EchoTwoZero View Post


I think you are both right but your earlier statements were worded in such a way as it could be confusing. "6GB for the Titain Z" is worded strangely Kane2207 as there are two GPUs, making one think that you think there is only 3GB per GPU. Leading to this.

I apologise for the confusion. My original response was to the comparison with 3GB on the SLI Ti vs 12GB on the Titan Z.

The Titan Z would still only have an effective 6GB, the same as Titans in SLI.

I get a little lazy with the phone typing sometimes smile.gif
Meh
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post #602 of 747
Titan Z has 12 GB VRAM (6 GB VRAM per GK110 Core). In SLI configuration, the Titan Z can only use 6 GB VRAM for both cores. However in non-SLI configuration, the Titan Z can use all 12 GB for both cores. In non-gaming situations, one can use the Titan Z's entire 12 GB VRAM for both cores (since SLI seems to be a gaming-oriented feature and both cores can run independently without SLI in professional programs).
    
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post #603 of 747
Quote:
Originally Posted by Star Forge View Post

Titan Z has 12 GB VRAM (6 GB VRAM per GK110 Core). In SLI configuration, the Titan Z can only use 6 GB VRAM for both cores. However in non-SLI configuration, the Titan Z can use all 12 GB for both cores. In non-gaming situations, one can use the Titan Z's entire 12 GB VRAM for both cores (since SLI seems to be a gaming-oriented feature and both cores can run independently without SLI in professional programs).

Each GK110 has it's own memory controller linked to a dedicated 6GB memory.

I do not believe this memory is not shared cross the GPUs.... even if it was, then you would have to worry about NUMA.
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post #604 of 747
Quote:
Originally Posted by DuckieHo View Post

Each GK110 has it's own memory controller linked to a dedicated 6GB memory.

I do not believe this memory is not shared cross the GPUs.... even if it was, then you would have to wo;)rry about NUMA.

What I meant to say is that you are still using 12 GB of VRAM total but per core, it can only use 6 GB. In SLI, both cores can only use 6 GB VRAM as the other half is buffering a redundant copy of memory from the primary VRAM of the primary core?
    
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post #605 of 747
Quote:
Originally Posted by Star Forge View Post

What I meant to say is that you are still using 12 GB of VRAM total but per core, it can only use 6 GB. In SLI, both cores can only use 6 GB VRAM as the other half is buffering a redundant copy of memory from the primary VRAM of the primary core?
"Why'd ya have to make things so complicated..."
post #606 of 747
Quote:
Originally Posted by Star Forge View Post

What I meant to say is that you are still using 12 GB of VRAM total but per core, it can only use 6 GB. In SLI, both cores can only use 6 GB VRAM as the other half is buffering a redundant copy of memory from the primary VRAM of the primary core?
Ahhhhhhhhh.... gotcha ya. thumb.gif

As in... for compute tasks, the memory can be used independently. I was thrown off by the "Titan Z can use all 12GB" part. In compute usage, it would just appear like two GPUs with 6GBs each.
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post #607 of 747
Quote:
Originally Posted by EchoTwoZero View Post

"Why'd ya have to make things so complicated..."

Cause nVidia's marketing... tongue.gif
Quote:
Originally Posted by DuckieHo View Post

Ahhhhhhhhh.... gotcha ya. thumb.gif

As in... for compute tasks, the memory can be used independently. I was thrown off by the "Titan Z can use all 12GB" part. In compute usage, it would just appear like two GPUs with 6GBs each.

Yeah that is what I figured in the end... nVidia should of marketed their dual GPU VRAM configuration as 2x 6 GB and not just a flat out 12 GB.
    
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post #608 of 747
Quote:
Originally Posted by DuckieHo View Post

In compute usage, it would just appear like two GPUs with 6GBs each.

Are you sure about this? I was under the impression that for compute, it was just the CUDA core count and the total available memory. So it's not two GPUs, it's the five thousand some CUDA cores. That the CUDA core is the unit of importance, not the hunk of silicon they're a part of.
post #609 of 747
Quote:
Originally Posted by Mand12 View Post

Are you sure about this? I was under the impression that for compute, it was just the CUDA core count and the total available memory. So it's not two GPUs, it's the five thousand some CUDA cores. That the CUDA core is the unit of importance, not the hunk of silicon they're a part of.

So you are saying that the Titan Z has an advantage over 2x Titan Blacks because each CUDA core has more access to more VRAM in computational purposes?
    
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post #610 of 747
Guys they are just 2 gpus with a plx chip. Its like titan black sli on a single pcb. Nothing different. Each gpu has its own vram,memory controller etc etc. Even on compute they are just 2 gpus.
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