Questions About SLI

[Jeremy998]

I have an MSI Twin Frozr II GeForce GTX 560 Ti 2GB GPU. I was thinking about getting a second one really soon, but I have a few questions first.

I play Battlefield 3 a lot and I get about 40-45 FPS while playing it. Will getting a second card improve the game significantly or not? And if you know, how much of a difference should I expect to see?

Second, I have a corsair TX750 V2 750W power supply. Will this be able to power two GTX 560 Ti's plus my other hardware?

I know I'm asking a lot, but I'm sure there's somebody who can give me an answer.

Components:
AMD Phenom II X4 975
Asus Sabertooth 990FX
MSI Twin Frozr II GeForce GTX 560 Ti 2GB
G.Skill Ripjaws Series 8GB (2x4GB) 1600
Corsair TX750 V2

 

[RussK1]

I have an MSI Twin Frozr II GeForce GTX 560 Ti 2GB GPU. I was thinking about getting a second one really soon, but I have a few questions first.

I play Battlefield 3 a lot and I get about 40-45 FPS while playing it. Will getting a second card improve the game significantly or not? And if you know, how much of a difference should I expect to see?

Second, I have a corsair TX750 V2 750W power supply. Will this be able to power two GTX 560 Ti's plus my other hardware?

I know I'm asking a lot, but I'm sure there's somebody who can give me an answer.

Components:
AMD Phenom II X4 975
Asus Sabertooth 990FX
MSI Twin Frozr II GeForce GTX 560 Ti 2GB
G.Skill Ripjaws Series 8GB (2x4GB) 1600
Corsair TX750 V2

You'd be able to run another 560ti fine.

SLI? In a perfect world you'd get double the performance. This isn't always the case but BF3 is optimized for multi-GPU setups so you can expect to see atleast 90% scaling. So say you get 45fps @ Ultra 4xAA you could expect to see ([45 x .9] + 45) = 85.5fps.

 

[inzone]

When doing a SLI setup for gaming the second card will add to the fps of the game but it will depend on the game by how much you will see. A game like BF3 is very hard on video cards to begin with so the added fps will not be as much as say a game like MW3. So while you could expect to see double the fps in MW3 , you won't see double in BF3 and every game will be different. The one thing you can count on is that there defenitly will be a performance boost that will be woth it. Except in a game like NW3 which has a fps cap and you can't get more than 91 fps , which I can get with a single GTX 580.
You will be able to run the two 560Ti's with your power supply.

 

[RussK1]

When doing a SLI setup for gaming the second card will add to the fps of the game but it will depend on the game by how much you will see. A game like BF3 is very hard on video cards to begin with so the added fps will not be as much as say a game like MW3. So while you could expect to see double the fps in MW3 , you won't see double in BF3 and every game will be different. The one thing you can count on is that there defenitly will be a performance boost that will be woth it. Except in a game like NW3 which has a fps cap and you can't get more than 91 fps , which I can get with a single GTX 580.
You will be able to run the two 560Ti's with your power supply.

Just ran a 90sec benchmark on BF3 "Going Hunting" @ Ultra 2xAA 6048x1080 and here's what I got~

2 GPU's = Frames, Time (ms), Min, Max, Avg
3815, 90000, 32, 52, 42.389

4 GPU's = Frames, Time (ms), Min, Max, Avg
6350, 90000, 38, 96, 70.556

The differences are in the scaling... with 2 the scaling was 100% and with 4 the scaling was 90-95%. So a two card setup should net close to 2X the frames being the scaling is good.