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GTX 570 1280MB in SLI vs GTX680 4gb SLI vs GTX660ti 3gb 3-way-sli - Page 6

post #51 of 75
Quote:
Originally Posted by Blutonium90 View Post

Quote:
Originally Posted by DaFirnz View Post

Use MSI Afterburner to check if you're running into memory limitations or "horsepower" limitations/
If its a "horsepower" issue you could always add another 570 and go 3-way sli. I would imagine a used one is somewhat easy to come by.

I use the evga precision and I'm seeing 1200mb and sometimes over 1280mb usage in BF3 and in Wow it gets around the same. When I overclock the cards a little the fps gain is like 4 or 5 but the cards are getting quite hot.

If I buy a Nvidia card I think I skip on EVGA cards because of the heat.


I would wait for next gen or go cheap and get 7970s. The 4gb 680s are silly overpriced and you'd need a lot of them to get the power to tap into that memory size and quad scaling is not super, hence the rub.
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post #52 of 75
Thread Starter 
Quote:
Originally Posted by DaFirnz View Post

1280mb that would be your bottleneck right there. Unless you have a 2560mb version.
How is you cpu loading? Out of curiousity.
No. I'm not suprised that's the bottleneck.

I've got a Core i7 920 at 3.6 Ghz(I think that's a nice clock, and when i play the games I'm not getting higher on CPU load then 48-54% if I can trust the task manager and my Logitech monitoring tool. I never had a problem before the problem did came when I went to Surround Gaming.
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post #53 of 75
Quote:
Originally Posted by tsm106 View Post

Did you realize his test(that one specifically) and all test are run at bandwidths the equivalent of pcie 2.0 x16 due to the nature of tri/quads?
Here's the litmus test. If you think the bandwidth makes a whopper of a difference, Vega's system should beat my system easily since he's running pcie 3 x16 to my pcie 3 x8 (aka pcie 2 x16). What happens? Care to take a guess?

No, because the behavior of the AMD system may be very different like HARDOCP also states http://www.hardocp.com/article/2012/07/18/pci_express_20_vs_30_gpu_gaming_performance_review/12

I know about the PCi-E 2.0 x16 vs PCI-E 3.0 x8 debate very well... but other tests show almost 0 difference between PCI-E 2.0 x16 vs 3.0 x16 too.
http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/6.html

I don't claim Vega's test to be the "truth" - but we're getting test results ranging from one end to the other, and some contradictions in single card high-res scenarios
The only "truth" I can relate to is the fact that I've seen differences on my personal rig running 3-way SLi at PCI-E 2.0 16x 8x 16x vs PCI-E 3.0 16x 8x 16x. - and this goes for only nVidia cards !
Edited by Gripen90 - 10/26/12 at 12:54am
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post #54 of 75
Quote:
Originally Posted by Gripen90 View Post

Quote:
Originally Posted by tsm106 View Post

Did you realize his test(that one specifically) and all test are run at bandwidths the equivalent of pcie 2.0 x16 due to the nature of tri/quads?
Here's the litmus test. If you think the bandwidth makes a whopper of a difference, Vega's system should beat my system easily since he's running pcie 3 x16 to my pcie 3 x8 (aka pcie 2 x16). What happens? Care to take a guess?

No, because the behavior of the AMD system may be very different like HARDOCP also states http://www.hardocp.com/article/2012/07/18/pci_express_20_vs_30_gpu_gaming_performance_review/12

I know about the PCi-E 2.0 x16 vs PCI-E 3.0 x8 debate very well... but other tests show almost 0 difference between PCI-E 2.0 x16 vs 3.0 x16 too.
http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/6.html

I don't claim Vega's test to be the "truth" - but we're getting test results ranging from one end to the other, and some contradictions in single card high-res scenarios
The only "truth" I can relate to is the fact that I've seen differences on my personal rig running 3-way SLi at PCI-E 2.0 16x 8x 16x vs PCI-E 3.0 16x 8x 16x. - and this goes for only nVidia cards !


I've got no objections to some differences, it's to be expected to some extent, however your first post on this discourse...

My point was to always open your frame of reference up and maybe stop posting vegas bogus numbers. wink.gif
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post #55 of 75
Quote:
Originally Posted by tsm106 View Post

I've got no objections to some differences, it's to be expected to some extent, however your first post on this discourse...
My point was to always open your frame of reference up and maybe stop posting vegas bogus numbers. wink.gif

Fair enough smile.gif

Also I see he's running at 16x8x8x8 PCI-E.3.0 and If PCI-E 3.0 x8 is equivalent to PCI-E 2.0 x16 then you already got the answer to the performance difference in my way of understanding the test.
When he's running PCI-E 2.0 they are 16x8x8x8 ! aka translating to PCI-E 2.0 x8 and vs PCI-E 3.0x8. - this may very well be what's causing the difference.
If the test was running at PCI-E 2.0 16x16x16x16 then there may have been 0 difference !...but the motherboard can't do PCI-E 2.0 x16 electrical speeds on lanes to my knowledge.
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post #56 of 75
7970s are a good option if you don't care about 3D. I keep hearing they scale better at big resolutions, but I've never looked into it closely because I do want a workable 3D solution as well. If I didn't want 3D I'd jump to AMD in a heartbeat - 5x1P, 3x2L, PLP, better scaling (reportedly) - there are significant advantages.

On the nvidia side:

I'd go 4GB 680s and leave the option open of adding a third one later - you probably won't max out most stuff with just 2 cards, but at least you'll have an upgrade pathway. If you go 3way straight away, you're pretty much stuck with the performance you get now.

I have 3 x 1.5GB 580s at 6040x1080, and I can max out BF3 for example, with the exception of HBAO - with HBAO it's still OK, but not the best frames ever. I can't run any AA other than FXAA obviously, but I don't care about that personally - FXAA looks fine to me. 2 x 680s would be maybe 20% slower than 3x580s so I think they would be marginal, but you should be able to run high settings.

You should get a lot of VRAM - I wish I had 3GB 580s - although 1.5GB is fine so far, I am kind of stuck in that I don't upgrade that often, I have a f(%kton of processing power, but I don't have the VRAM to go with it and in future that's likely to be the limiting factor for my setup rather than the GPU cores.

I think you're going to have to plan to have just as much processing power as you can possibly get for this resolution if you want the cards to last you a while, so it has to be 680s. 3-way scaling is really good for me, I don't know how much diminishing returns there is adding a 4th card, but still if you got 2x680 you'd have at least one decent upgrade and possibly be able to put two more in to good effect, and it'd be pretty cheap (comparatively) to do so in a year or whatever once newer cards are out, assuming you already have the PSU and motherboard to handle it.
Edited by BorisTheSpider - 10/26/12 at 6:19am
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post #57 of 75
Thread Starter 
Guy's,

Realy thanks for all the input. I made up my mind and have choosen for the following setup, call me crazzy or stupid or what ever, I'm happy to get it hehe xD.

3 x Asus GTX670 -DC2-4GB GDDR5 - €432 ,- each so that's : €1296

But there is one thing I'm not sure of. I have got a Cool Master Silent Pro 1000W power supply with 85%-90% efficiency, not sure if the 1000W will be enought with my other parts. Anyway I will check that out.
Edited by Blutonium90 - 10/26/12 at 6:42am
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post #58 of 75
You might get away with a 1000w power supply mate but I would go a little bit extra for headroom. I'd go with a 1200w gold power supply TBH!

Just found this for ya http://www.guru3d.com/articles_pages/geforce_gtx_670_2_and_3way_sli_review,1.html and they too use a 1200w power supply.
post #59 of 75
Quote:
Originally Posted by Blutonium90 View Post

Guy's,
Realy thanks for all the input. I made up my mind and have choosen for the following setup, call me crazzy or stupid or what ever, I'm happy to get it hehe xD.
3 x Asus GTX670 -DC2-4GB GDDR5 - €432 ,- each so that's : €1296
But there is one thing I'm not sure of. I have got a Cool Master Silent Pro 1000W power supply with 85%-90% efficiency, not sure if the 1000W will be enought with my other parts. Anyway I will check that out.

You should be fine, I wouldn't get the DC2 models. Grab some reference models because they will cool the best in SLI. The reference models will exhaust the air out of the case, rather than just blow the air over the top of the card.

Since SLI 680s only require ~650W PSU, you should be fine with a 800W+ PSU, but it must be a quality PSU.
Edited by Ironman517 - 10/26/12 at 10:55am
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post #60 of 75
Good choice. Should run very nicely.

1000w will be plenty - I just hit 1KW with 3x580s overclocked, so 670s will be significantly below that.
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