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

Poll Results: Does VRAM stack in SLI / Crossfire?

 
  • 3% (1)
    Yes!
  • 96% (28)
    No!
29 Total Votes  
post #1 of 17
Thread Starter 
Basically, I'm tired of hearing it does stack from someone and then reading another post somewhere else stating it doesn't stack.

The latest one I just got done reading: an amazon review of the Titan

I just want some solid proof laid out in front of me. Does VRAM stack or not? Please... proof.gif

Also, while I'm here and curious, does the GTX690 have 4GB of VRAM or just 2GB? The product specifications all say 4GB, but, again, I'm hearing different information from different people claiming it's really only 2GB per card, which doesn't add up to 4GB.

THANK YOU! wheee.gif
post #2 of 17
There is 4GiB of VRAM physically present on the card.

However, each GPU needs it's own pool of memory, and contents are mirrored, so it's 2GiB effective.
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post #3 of 17
they don't stack and 690 is a sli card with 2 gb vram on each on one card.
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post #4 of 17
No, it does not, never did. Same for dual GPU cards.
post #5 of 17
No it doesn't stack.
So.
2x2gb cards only have 2gb of VRAM.


And what blameless said.
Small wonder.
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Small wonder.
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post #6 of 17
the vram only stacks on the box biggrin.gif
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post #7 of 17
Nope in multi GPU setups the memory hast to be mirrored so that both cards access to the same information. As a result a dual GPU card like the GTX690 only has 2GB of effective memory despite having 4GB of physical memory on the card.
    
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post #8 of 17
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

the vram only stacks on the box biggrin.gif

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)
post #9 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)

Like I said in my post the GTX 690 does have 4GB physically on the card but as its only 2GB per GPU there is only 2GB effective memory due to how SLI works. I agree that marketing the GTX690 as having 4GB of memory is misleading but technically its true.

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.
Edited by Bit_reaper - 2/28/13 at 9:27am
    
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post #10 of 17
Quote:
Originally Posted by Nocturnal Link View Post
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)

 

It's not like RAID0 - there you do get to use the whole capacity (2 1TB drives is RAID0 gives you 2TB of space).

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