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Please! Does VRAM stack in SLI / Crossfire or not? - Page 2

Poll Results: Does VRAM stack in SLI / Crossfire?

 
  • 3% (1)
    Yes!
  • 96% (28)
    No!
29 Total Votes  
post #11 of 17
It's like RAID 0 in the sense that performance is effectively doubled, but unlike RAID 0 in the sense that effective capacity is not...closer to a RAID 1 on a good controller (where each drive can be read simultaneously).

Anyway, the reason for this is coherency. If each GPU was allowed access to memory on the other, it would require a much wider inter-GPU link than an SLI Bridge + PCI-E could provide, and latency would still be worse. It's vastly easier to simply mirror the VRAM, than to develop and integrate a new bus or interconnect capable of ~300-600GB/s (enough for each GPU to access the memory of the other at full speed, simultaneously, and still handle normal SLI overhead on top) and connecting the GPUs together with it.
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post #12 of 17
Nope, you'll only have as much vram as a single GPU carries no matter how many GPU's you have.
 
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post #13 of 17
Even though the vram doesn't double up in SLI, it's important to note that in SLI each card now only has to process ~50% of what it usually does wink.gif
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post #14 of 17
Thread Starter 
Quote:
Originally Posted by Bit_reaper View Post

Its not like RAID 0 more like RAID 1 as in the information on both sets of memory are synchronized though unlike RAID 1 there is no redundancy.

Yeah, never mind the RAID comment... I had a brain fart issue mixup... thing. Heheh. redface.gif
post #15 of 17
Quote:
Originally Posted by Nocturnal Link View Post

After only about two minutes of waiting before a page refresh, I'm fairly confident it does not stack; so, why is it that companies claim the 690 has 4GB of VRAM?

Anyone who reads the specifications and doesn't know any better would immediately assume that's 4GB of useable VRAM. What's with that bogus?

Thanks to everyone for clearing that up for me. Sounds to me like it's similar to a RAID 0 array, from what Blameless stated. Is that so? (curious on how it works)

to make matters worse
many review sites when they do SLI/CFX they also like to stack frame buffer tricking buyers thinking they have access to all this ram
boy I wish that were true...in a year or two I could really use that extra 2GB from my SLI tongue.gif
     
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post #16 of 17
Quote:
Originally Posted by haydeljudy View Post

This seems abnormally good. Watch my core suck at a result

So, I figured you posted in the wrong thread and out of curiosity, clicked your name and checked the other threads you've posted in. All twelve (so far) of your posts are the same as this one. I can't help but wonder: what the hell?
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post #17 of 17
Quote:
Originally Posted by Nocturnal Link View Post

Anyone who reads the specifications and doesn't know any better would immediately assume that's 4GB of useable VRAM. What's with that bogus?
Welcome to the wonderful world of marketing.

It's also known as being creative with the truth.
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