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BF3 VRAM: 580 Lightning 3GB vs 570 SLI 1280mb

post #1 of 8
Thread Starter 
Would I actually be better off getting a single GTX 580 with 3GB vram rather than 2 570's with 1280mb vram? I'm afraid of vram bottle necking a pair of 570's at 1900x1200.

Thanks
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post #2 of 8
Thread Starter 
http://www.overclock.net/graphics-ca...ion-gpu-8.html

Post on this thread seems to answer my question, at 1080p I should be fine with 570s
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post #3 of 8
If those are your only choices, I would opt for the two 570's over a single 580, regardless if it had 1.5GB or even 3GB of VRAM. Remember, having more VRAM does not make up for a lack of raw processing power. It's also important to note that stock for stock, a single 570 is only 10-15% slower than a single 580. Therefore, two 570's will beat out a single 580 in just about any situation where SLI can be used to your advantage; and since very few modern games have issues with multi-GPU setups you should be good to go.
     
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by covertash View Post
If those are your only choices, I would opt for the two 570's over a single 580, regardless if it had 1.5GB or even 3GB of VRAM. Remember, having more VRAM does not make up for a lack of raw processing power. It's also important to note that stock for stock, a single 570 is only 10-15% slower than a single 580. Therefore, two 570's will beat out a single 580 in just about any situation where SLI can be used to your advantage; and since very few modern games have issues with multi-GPU setups you should be good to go.
Thanks, I'm nervous because I've experienced vram bottleneck before, my 460 has the power to play Bad Company 2 on high + 1080p but the lack of vram forces me to play at a lower resolution.

When you say "If those are your only choices", can you think of something better considering the rest of my rig? I can't do 580 SLI because of my PSU so I thought 580/590/570 SLI were my only choices at the high end.
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post #5 of 8
I can't recall where I saw it, but I did see a post or news article somewhere addressing that Ultra/High textures are NOT in the beta, which means for high-end systems the beta is not necessarily the best judge of performance. We could very well see the 3GB 580s perform MUCH better than 570s in the full version simply because of the added HD textures.
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post #6 of 8
Quote:
Originally Posted by Jarobata View Post
Thanks, I'm nervous because I've experienced vram bottleneck before, my 460 has the power to play Bad Company 2 on high + 1080p but the lack of vram forces me to play at a lower resolution.

When you say "If those are your only choices", can you think of something better considering the rest of my rig? I can't do 580 SLI because of my PSU so I thought 580/590/570 SLI were my only choices at the high end.
A pair of 580's will run on a 750W PSU, as will a single 590. I have a Belkin power usage monitor (similar to a Kill-A-Watt) and in my dual 580 usage (even when I had a Corsair HX-750), very rarely did I ever see power usage go past 650W from the wall. In fact, even when it spiked up a little over 700W, it was still well within the capabilities of a 750W PSU because, again, those power draw figures were taken from the wall outlet before efficiency is factored in.

This means that even if my whole system drew 700W, factoring in 85% efficiency (just as a rough example), we get around 595W of actual power draw - well below the 750W rated output.

Now with that said, I had a pair of 570's and eventually Stepped Up to a pair of 580's. The difference in VRAM between the two was not actually noticed until I started using my old Surround setup. When I used them both on a single 1920x1200 monitor, like how I am now, there was no perceivable difference between the two configurations as framerates were already at minimum or near 60fps at all times - even with the two 570's.

Therefore, if you are going to be keeping your current monitor for some time to come, I don't perceive you running into performance issues any time soon. By the time you actually notice a true VRAM issue at your resolution, chances are it would be time to upgrade due to the lack of power from the actual GPU core itself. Besides, how many games like BF3, Crysis, and Metro's come out per year?

But if you've got the money, won't starve yourself, and BF3 is the game that you will be playing the most, then 580's are a better choice (albeit slightly).
     
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post #7 of 8
Quote:
Originally Posted by Xyxyll View Post
I can't recall where I saw it, but I did see a post or news article somewhere addressing that Ultra/High textures are NOT in the beta, which means for high-end systems the beta is not necessarily the best judge of performance. We could very well see the 3GB 580s perform MUCH better than 570s in the full version simply because of the added HD textures.
I think what might happen with the full version is if you don't have so much vram then more of the maps textures that aren't as important (can't really be viewed) from your close location/view won't permanently be there as there won't be as much space to hold them, and the memory will be needed and used more for what is viewable. I don't know if it will make it run any better though, but I think it would be better visually as it can store more information at a time and maybe things that are further away from you will still have their full HD textures.
Edited by smaudioz - 10/9/11 at 5:07pm
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post #8 of 8
I know that with my single 570, the BF3 beta used all of its available VRAM while playing on Ultra. This said though, there is a known memory leak, so you should probably wait for the final game to be released before making a judgement call.
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