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Considering a GTX 580 SLI...graphics card Q

post #1 of 24
Thread Starter 
Guys,

I ended up buying the EVGA GTX 580 SC, and it's a good card, but it only has the 1.5G mem. From what I am hearing, when you SLI, the mem doesn't add, so I'll still have just the 1.5G. Is that a problem for considering this kind of build? One other thing I noticed is that when you go into the video props, on my system it says: it gives 2559M "shared system memory", and also: "total available graphics memory" 4095M. Isn't that enough to essentially run any 32-bit game in the video RAM-space? Should I not consider this SLI with this config?
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post #2 of 24
Video Ram isn't used to store the game, but it stores specific information for rendering the game. Textures, lightning, buffers, etc. Large amounts of VRAM are needed for high resolutions, high quality textures, lots of antialiasing, etc.

Having a "big" game won't necessarily mean it uses more Vram. You need to consider your resolution normally. 1.5GB is usually fine up to 2560x1600 for most games, once you go multimonitor or use mods that bump up textures then you might consider going for more VRAM.

RAM isn't shared because the default method of rendering is AFR, Alternate Frame Rendering. In this method, each card renders a full scene and thus requires an entire set of the resources in its ram.

Other methods like Tiling or Scissor, things get tricky, but those methods haven't been considered in years. AFR is by far the most reliable and is pretty much the defacto SLI method.
Edited by Crest - 10/18/11 at 10:31am
post #3 of 24
1.5GB is fine upto around 2560x1600, Nvidia Surround is where 3GB models are required.
 
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post #4 of 24
Thread Starter 
ok, so it sounds like if I am going to be gaming in 1920x1080 on *one* monitor, then I should be fine....
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post #5 of 24
Games like BF3 require more than 1.5gb with all the fancy settings, even on one screen and 1080p. 3GB would be nice for future proofing because more and more games are requiring more vram. They need to find a way to stack vram in sli. That just seems stupid that they don't...
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post #6 of 24
Quote:
Originally Posted by dseg View Post
Games like BF3 require more than 1.5gb with all the fancy settings, even on one screen and 1080p. 3GB would be nice for future proofing because more and more games are requiring more vram. They need to find a way to stack vram in sli. That just seems stupid that they don't...
The game hasnt been released yet no one knows how much vram you will need.
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post #7 of 24
Quote:
Originally Posted by dseg View Post
Games like BF3 require more than 1.5gb with all the fancy settings, even on one screen and 1080p. 3GB would be nice for future proofing because more and more games are requiring more vram. They need to find a way to stack vram in sli. That just seems stupid that they don't...
If you are referring to the Beta it had a Vram leak. So unless you work for Dice you are just making stuff up.

I love my SLI 580s they will crush anything I throw at them! You wont be sorry you got them.

Sli you only get as much as each card has to 1.5Vram will be what you have max it does not add together.
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post #8 of 24
Quote:
Originally Posted by dseg View Post
Games like BF3 require more than 1.5gb with all the fancy settings, even on one screen and 1080p. 3GB would be nice for future proofing because more and more games are requiring more vram. They need to find a way to stack vram in sli. That just seems stupid that they don't...
Sorry, did you say future proof? I guess you haven't been here too long then.
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post #9 of 24
Thread Starter 
haha yeah, the "future proof" issue pretty much caused a logic fault in my brain and I was having trouble addressing it...One thing that I could do is buy a 3G version of the 580 and pair it with my 1.5. Then, if I ever need to, just buy another 3G and replace. That's iffy I think tho. If, given what I play, this lasts me even 2-3 years, when I NEED to do a hardware replacement, the 580s will most likely be obselete. Meaning, I would throw both and replace with whatever is current. It's a tough call. Open to suggestions. Although, from what I am hearing, sounds like dual 1.5s are still a very good choice.
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post #10 of 24
Get another one of your EVGA SC 1.5GB cards. You'll be fine.
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