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What adds up in SLI? - Page 2

post #11 of 19
Thread Starter 
ok one last question but I think I kno the answer...My card has a mem clock of 1800 and the one I might bid on has 1600, but they both are 640. With the mem clock be brought down to 1600 if I go SLI?
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post #12 of 19
Quote:
Originally Posted by trojanuke View Post
ok one last question but I think I kno the answer...My card has a mem clock of 1800 and the one I might bid on has 1600, but they both are 640. With the mem clock be brought down to 1600 if I go SLI?
Yes. but you can overclock and try to get it higher.
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post #13 of 19
Thread Starter 
great thanks!
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post #14 of 19
Umm, they work at 1.4~1.8x faster than a single card.
RAM stays the same though, I think, so it's not like two 512MB cards would give you 1GB of RAM to use right?
    
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post #15 of 19
Quote:
Originally Posted by xHassassin View Post
Umm, they work at 1.4~1.8x faster than a single card.
RAM stays the same though, I think, so it's not like two 512MB cards would give you 1GB of RAM to use right?
It depends on the game TBH - some SLI can even result in a lower minimum frame rate. I think you'd be very lucky to get 1.8x faster in many games

And the RAM on each card will be filled with the textures which each individual card needs, so if you've got 256MB cards you may be able to move to high quality textures which need say 500MB - that's just a guess though
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post #16 of 19
Quote:
Originally Posted by xHassassin View Post
Umm, they work at 1.4~1.8x faster than a single card.
RAM stays the same though, I think, so it's not like two 512MB cards would give you 1GB of RAM to use right?
SLI does not scale 80% It maxes out at 75%(9600GT) If you SLI two 512MB cards, you have 512MB to use as video memory.
post #17 of 19
Quote:
Originally Posted by RussianGrimmReaper View Post
SLI does not scale 80% It maxes out at 75%(9600GT) If you SLI two 512MB cards, you have 512MB to use as video memory.
When you round 1.75 to the nearest tenth you get 1.8.

Thanks for answering my question about the RAM though.
    
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post #18 of 19
RAM does not get double because (simplified):


In split screen mode, each card gets passed the same initial data. Each card then takes and works on half of this data (top or bottom of image). Then the processed image gets combined. The cards "waste" the memory since they only work on some of it.

In alternating frame mode, each card gets to process the whole image. Then the other card works on the next image. Since only 1/2 the memory is in use, you still end up with the same memory space.
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post #19 of 19
Quote:
Originally Posted by DuckieHo View Post
RAM does not get double because (simplified):


In split screen mode, each card gets passed the same initial data. Each card then takes and works on half of this data (top or bottom of image). Then the processed image gets combined. The cards "waste" the memory since they only work on some of it.

In alternating frame mode, each card gets to process the whole image. Then the other card works on the next image. Since only 1/2 the memory is in use, you still end up with the same memory space.
Thank you Ducky

For any UK people interested, CustomPC did a massive round up on SLI and Crossfire. There were a surprising number of falls in min frame rates - IIRC 9600GT was the best one to SLI
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