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Graphics card decisions (GTX 670, 7950 or 7970) - Page 2

Poll Results: What would you do?

 
  • 22% (2)
    Buy another 670 Sig2 2 GB
  • 22% (2)
    Buy a 7950
  • 55% (5)
    Buy a 7970
9 Total Votes  
post #11 of 21
Thread Starter 
Quote:
Originally Posted by Skorpian View Post

If you're really hiting your vRam wall you won't be dipping into low 40's, you'd be dipping into unplayable framerates, 40's are considered playable. So you're not really hiting your vRam wall.
I think I'm getting pretty close though. wink.gif

I kind of think I'm going to stay with my 670 though, because I don't want to go through all the trouble of selling it and buy another card, a 7950 or 7970. It'd be easier to just get another GTX 670.

Thanks for the advice!
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post #12 of 21
Quote:
Originally Posted by cam51037 View Post

I think I'm getting pretty close though. wink.gif

I kind of think I'm going to stay with my 670 though, because I don't want to go through all the trouble of selling it and buy another card, a 7950 or 7970. It'd be easier to just get another GTX 670.

Thanks for the advice!
Just a word of warning, I'm pretty sure I'm correct in saying that going SLI/XFire doesn't actually increase your available VRAM. So if you get another 670 you will still only have 2GB of effective VRAM. However, I think you've determined that your lower FPS isn't due to a lack of VRAM, so going SLI will almost certainly get you higher frame rates.
post #13 of 21
Quote:
Originally Posted by KaiserFrederick View Post

Just a word of warning, I'm pretty sure I'm correct in saying that going SLI/XFire doesn't actually increase your available VRAM. So if you get another 670 you will still only have 2GB of effective VRAM. However, I think you've determined that your lower FPS isn't due to a lack of VRAM, so going SLI will almost certainly get you higher frame rates.

You are right, having Quad 670 4GB will not give you 16GB Vram wink.gif
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post #14 of 21
Thread Starter 
Quote:
Originally Posted by KaiserFrederick View Post

Just a word of warning, I'm pretty sure I'm correct in saying that going SLI/XFire doesn't actually increase your available VRAM. So if you get another 670 you will still only have 2GB of effective VRAM. However, I think you've determined that your lower FPS isn't due to a lack of VRAM, so going SLI will almost certainly get you higher frame rates.

Quote:
Originally Posted by KaRLiToS View Post

You are right, having Quad 670 4GB will not give you 16GB Vram wink.gif
+Rep both!

Yes, I already knew that before. I'm not exactly sure why though, if someone could explain that I'd be grateful. smile.gif

Although a quad 670 SLI with 16 GB VRAM would be an absolute monster!
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post #15 of 21
As someone else said you aren't hitting your vRAM limit unless you are dropping to 5fps whenever you turn around. If you want to reduce your usage graphs then a trick is to disable Windows Aero, it's quite frankly a vRAM hog and is most likely taking up a good 400MB or so.

Honestly at 1440p you don't need AA, to me personally with a 2048x1536 CRT @ 85Hz its a waste of frames that I could be using to make my game smoother
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post #16 of 21
I've got 2GB 670 FTW's in sli and I noticed last night that while playing Bioshock Infinite Afterburner showed the cards using 1933 MB of VRAM at 1080p all settings ultra. I'm starting to scond guess my decision to go sli last month. Honestly, I'm kicking myself for not waiting on the 700 series cards.
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post #17 of 21
Quote:
Originally Posted by cam51037 View Post


+Rep both!
Yes, I already knew that before. I'm not exactly sure why though, if someone could explain that I'd be grateful. smile.gif
Although a quad 670 SLI with 16 GB VRAM would be an absolute monster!


The memory (Vram) in all GPUs are the same data. So each data is mirrored in all the GPUs in Crossfire or SLI

Better explanations
Quote:
The reason it works that way is because current multi-GPU rendering methods generally use Alternate Frame Rendering (or some variant thereof). They do not work in tandem to render the same frame, they work independently to render alternate frames. Since they work independently this means that they both need to have all the data necessary to render the frame that they are working on without relying on the other GPU.
Quote:
GPU A can't access the VRAM on card B fast enough. It would simply cripple memory performance and thus destroy performance.

http://www.overclock.net/t/1365868/please-does-vram-stack-in-sli-crossfire-or-not/0_30
Edited by KaRLiToS - 3/26/13 at 7:13pm
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post #18 of 21
Thread Starter 
Quote:
Originally Posted by KaRLiToS View Post

The memory (Vram) in all GPUs are the same data. So each data is mirrored in all the GPUs in Crossfire or SLI

Better explanations

http://www.overclock.net/t/1365868/please-does-vram-stack-in-sli-crossfire-or-not/0_30
Thanks so much for the explanation!

So it's kind of like RAID1, but on GPU's, but RAID0 isn't possible on GPU's kind of deal?
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post #19 of 21
One card run top half of screen and other card does the bottom half



2gb is nice, 3 gives you a lil more room.
post #20 of 21
Quote:
Originally Posted by cam51037 View Post

Thanks so much for the explanation!

So it's kind of like RAID1, but on GPU's, but RAID0 isn't possible on GPU's kind of deal?

Kind of. tongue.gif

No, RAID0 cannot happen on GPUs. I wished it worked like this. thumb.gif

Quote:
Originally Posted by KEITHRH12 View Post

One card run top half of screen and other card does the bottom half
.

This is kind of wrong, all GPUs have the same information. Lets say I have 4 x GPUs. They will have exactly the same data in all of the Vram. If I play 8044x1440, They will have the same data for the whole resolutions. Thats why a Titan at 6GB is better for higher resolutions.

GPU 1 Vram:

GPU 2 Vram:

GPU 3 Vram:

GPU 4 Vram:
Edited by KaRLiToS - 3/26/13 at 7:46pm
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