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no. they would be faster
I was just curious. Please ignore any cost difference. But would they be equal in performance?
dumb question... but why does sli help in higher resolutions so much then when talking about cranking up AA and AF? I thought the amount of AA and AF was largely dependent on the ram on the card so then sli would give no benefit at all in this
if SLi doesnt use both sets of memory per card, than wouldnt it be better just for video card makers to just make a card that has no memory on it to be used exclusively for SLi only, thereby making the cost of the second card used for SLi cheaper, which could entice more people to actually use SLi since the price is lower??
So then just buy the cards with dual GPU's on them in a single card and no use for SLI
having memory on both helps, period.
remove the memory you remove the double memory bandwidth which would then lower performance.
i am not arguing that it isnt happening, i am saying it sounds like it is wasting available memory size, there is difference. another example.. lets say you have 2GB of system mem at x mem bandwidth and if you add 2GB more sys mem you will get double the mem bandwidth but still have only 2GB of available ram (i know that is NOT true, it is an example of how SLi is wasting available mem size). I plan on going SLi on my next build though, I am just trying to understand why nvidia is doing with SLi.
You guys aren't understanding how SLI works.
The guy who said "RAID 1" Was most correct.
Having 2 cards does NOT double memory bandwidth.
Each core has to use it's own, original bandwidth, with identical data on each set of ram.
The reason AA and AF are faster on SLI is because they have half as much stuff to AA and AF per card. The bandwidth isn't doubled, just those particular memory intensive jobs are halved per card.
You guys aren't understanding how SLI works.
The guy who said "RAID 1" Was most correct.
Having 2 cards does NOT double memory bandwidth.
Each core has to use it's own, original bandwidth, with identical data on each set of ram.
The reason AA and AF are faster on SLI is because they have half as much stuff to AA and AF per card. The bandwidth isn't doubled, just those particular memory intensive jobs are halved per card.
/edit: on another note, a nice memory SLI bridge would make sense, and make the memory amount double. there isn't much of a reason that the memory could not be SLI'd. It's done on multi processor motherboards all the time.
No it doesn't, since both cards have mirrored data on the RAM.Well this just depends on how you look at it. But you do have 2 cards. Both have, say, 64gb/s memory bandwidth. Effectively this adds up to 128gb/s.
No it doesn't, since both cards have mirrored data on the RAM.
does a raid 1 array double your throughput?
short answer:
no.
err yes it dose, but overhead, error correction, andwidth is used up doing subsequent opperations on given ....snip.......textures/pixels, but 768mb is lot of ram to fill, and considering the 4gb limit, its gotta be getting tight to buss limits as it is
if SLi doesnt use both sets of memory per card, than wouldnt it be better just for video card makers to just make a card that has no memory on it to be used exclusively for SLi only, thereby making the cost of the second card used for SLi cheaper, which could entice more people to actually use SLi since the price is lower??
It doesn't really "double" the memory bandwith, but each card GPU only have half the resolution to render which in turn use less memory bandwith.
No.
I did NOT say RAID 0.
I said RAID 1.
SLI is NOT like RAID 0.
It is like RAID 1.
Raid 1 does NOT double usable throughput.
Since both disks are holding the exact same data, usable throughput stays the same, it does not double (though twice the amount of data is being written in the same time, it's identical).
The RAM on both cards in SLI must hold the same data exactly. Therefore, bandwidth is the same, not doubled.
Please read before writing a book about something.
RAID 1 (not 0) can allow for increased READ performance if the controller is capable of it.
so YES it is kind of like RAID 1 with reading data faster allow for greater throughput.
What about SFR? I thought Split Frame Rendering meant each card rendered about 1/2 of the image. Do you use both video cards' RAM then? (in this case, 640 MB)?