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Performance of GTX 580 SLI in gaming... - Page 3

post #21 of 35
Each card runs cooler since it is splitting the load. Big advantage if you plan to overclock or stay on air cooling.

I agree with Alatar, enjoy the setup, it will run for years to come. I paid $3200 for my entire rig, don't regret a penny of it. Yea, if I waited 2 months I could have gotten Sandy Bridge, USB 3.0, and a GTX 580 for the same price, but who cares, I had an extra 2 months of doing whatever I wanted. Tech goes out of date as soon as you buy it, enjoy it while you have it.
Edited by Chunkylad - 4/28/11 at 12:38pm
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post #22 of 35
Thread Starter 
Quote:
Originally Posted by Alatar View Post
It will not be utilized ever.

It's just the basics of how SLI works with memory. You will have 1.5gb of usable vRAM even if you physically have 3gb.

That said, if you are gaming on a single monitor do not worry about the amount of vRAM. By the time you really need more you'll be getting much more powerful GPUs anyway.

And 2 GTX 580s are not a waste on a single monitor simply because with one you cannot achieve 60fps (not even worth mentioning that if you have a 120hz display you're going to benefit all the way upto 120fps).

I would keep the cards and enjoy the setup
I am going to get the Alienware Optx AW2310 and I will also be using Nvidia 3D Vision.......

So what do you think what performance I will be getting ??
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post #23 of 35
3D monitors do except 120 FPS, so that each eye gets 60 FPS. If you go 3D you will need ~twice the GPU power to go from 60 FPS to 120 FPS. If the games/detail/resolution level you play at require more than 1 580 to get 120 FPS constant in 3D, then you would defiantly benefit from SLi
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post #24 of 35
Quote:
Originally Posted by devdeep View Post
I am going to get the Alienware Optx AW2310 and I will also be using Nvidia 3D Vision.......

So what do you think what performance I will be getting ??
depends entirely on the game. But I would say that you're in the clear with that setup Of course you won't be pushing the 120fps all the time but that's no problem.

With 3d I would most definitely suggest keeping both of the cards.
 
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post #25 of 35
Quote:
Originally Posted by Alatar View Post
your eyes do not see thing is fps'. period. That alone makes your point pretty moot.

On top of that 60fps/hz is nowhere near the limit what the human eye can see.

What you are talking about is the refresh rate of the monitor which is 60Hz. Since the monitor cannot refresh the picture more often than 60times/s over 60fps becomes basically useless. Now if you move to true 120hz displays you WILL notice the difference between 60fps and 120fps guaranteed.
I agree wit u to this point that 120hrz monitor can make difference....but I dont know by how much.
@devdeep,
I agree with alatar,that more vram is needed only when u run monitor with extreme high resolution
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post #26 of 35
Quote:
Originally Posted by devdeep View Post
Hi guys,

I have recently bought 2 GTX 580 to do SLI......

Can you guys give me a full explanation of advantages and performance increase of SLI on the 580 ??

I also read only that a game uses only 1.5 GB of the Memory of one card in SLI ??? Is it true ??
Also please comment whether I should retain the Asus GTX 580 to do SLI or return it to get MSI GTX 580 Lightning ? ( As I havn't broken the seal, so my local reseller will take it back for another )

Thanks Guys,
Dev....

First off, I'm not sure why you bought two 580s and after you ask the advantages.

Secondly, the GPUs each get the same data, the same textures and information needed to be complied to an image.
Its just that each GPU make a different image.

So in short: GPU is making frame 1, second frame 2, again first does frame 3, second does frame 4 and so on.

This way, they are sharing the load, but each needs the same data o make the images.

If you can, you should replace a stock card with a lightning one (if you bought two stock ones).
The lightning is supposed to be cooler and better at overclocking (if that is your goal).
If you don't plan to overclock them, keep the stock and save your money.
Two of those will almost always max out everything on a 1080p or 1200p monitor.
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post #27 of 35
enjoy ur ultra-high-end (most reasonable) graphics set up
games such as metro 2033 will run smooth at 60 fps maxed out 1080p.

you should either get a 1600p monitor (most expensive), go surround (most hassle), or get a 120 Hz (least improvement, simply smoother motion) monitor since most other games (even crysis) will run in excess of 60 fps at 1080p

here's approximately how SLI works.
the frame buffer is mirrored across 2 cards (that is why you only have effectively 1.5 GB ram)
one card renders all of the odd frames, the other renders the even frames.
performance is theoretically doubled.
in real life, performance should be about 85% to 100% faster than single card. (hovering somewhere in the 90s with modern games; almost never reach 100)

and get the lightning if you plan on doing heavy overclocking, prefer lower temperatures, prefer lower noise or if the cards are priced similar.
Edited by james8 - 4/28/11 at 12:52pm
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post #28 of 35
Quote:
Originally Posted by devdeep View Post
I am going to get the Alienware Optx AW2310 and I will also be using Nvidia 3D Vision.......

So what do you think what performance I will be getting ??
Please don't get alienware, please don't support dell.
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post #29 of 35
Like Jam3s and Defoler said ...

It's not that all 3GB on your two cards isn't available to be used. It IS all available to be used.

However, the amount of data that has to be stored IN your gfx cards memory gets doubled when you run SLI, because each card has to have it's own copy of the same data, so that they can alternate rendering frames.

This is why your effective memory capacity doesn't grow when you add cards ... but the memory on all the cards is available to be used, it's not like one card's vram is wasted/sitting idle.

If you're familiar w/RAID-1 (mirrored) hard-drive arrays ... the way the video memory is used in SLI is the exact same idea
    
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post #30 of 35
Quote:
Originally Posted by Aniket View Post
the other 1.5gb will not be utilised,
in other words...most of the games dont take advantage of multi gpu...so best u go with 1x gtx580....since u wont run benchmark I wouldnt suggest u to go with 2 gpu's
Incorrect. The majority of today's major games do support SLi.

Also, both sets of 1.5 GB are utilized; they are just exact copies of each other so that the cards get the most bandwidth to memory. EDIT: Oh, this has been posted... Several times... Sorry.

If you're already getting 60 FPS and that's what your monitor supports, no need for upgrade. If, however, you can afford a GTX 580 and a new 120 hz monitor, get both
Edited by Concorde105 - 4/28/11 at 6:44pm
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