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Quick question about SLi

post #1 of 14
Thread Starter 
Hi , I was wondering that if I get a second normal EVGA GTX 670 2GB and 2 more monitors for 5760x1080? Will I be able to run most games such as FC3, BF3, and so on like graphic demanding games like those without any problems on ultra or max with a 750 watt psu? Or should I try to get the 4gb version of the cards? Thanks

Link to card just in case: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130782
Edited by xzantos - 3/26/13 at 9:58am
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post #2 of 14
You put all that is one sentence. lol. Your post is a bit confusing.

1.) The amount of amperage on the 12V rail or your PSU is WAY more important than the wattage. 750 watts is kind of borderline for that PSU, I would like more details about your PSU before I can give advise.

2.) SLi is VERY driver dependent and fickle. It doesn't magically double your frame rates. Some games will run amazing, some games will run like crap. Also, be prepared to deal with any heat or driver issues you might have. SLi is a bit of a pain in the butt.

3.) With a 5760x1080 resolution, depends on what FPS you find acceptable. With my knowledge of the power of those cards you should be able to run those games on 3 monitors,....but frame rates likely won't be always be at 60+. The games should still be very much playable. I wish I could find some benchmarks to back up my claim, but i am not coming up with anything.

4.) GPU memory matters a lot for textures. Having x2 2Gb cards in SLi should be all the video memory your ever need. I doubt those games will use half of the memory on the card.
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by crimsontears809739 View Post

You put all that is one sentence. lol. Your post is a bit confusing.

1.) The amount of amperage on the 12V rail or your PSU is WAY more important than the wattage. 750 watts is kind of borderline for that PSU, I would like more details about your PSU before I can give advise.

2.) SLi is VERY driver dependent and fickle. It doesn't magically double your frame rates. Some games will run amazing, some games will run like crap. Also, be prepared to deal with any heat or driver issues you might have. SLi is a bit of a pain in the butt.

3.) With a 5760x1080 resolution, depends on what FPS you find acceptable. With my knowledge of the power of those cards you should be able to run those games on 3 monitors,....but frame rates likely won't be always be at 60+. The games should still be very much playable. I wish I could find some benchmarks to back up my claim, but i am not coming up with anything.

4.) GPU memory matters a lot for textures. Having x2 2Gb cards in SLi should be all the video memory your ever need. I doubt those games will use half of the memory on the card.

Yeah sorry about that, I fixed it. As for my PSU I have this one which I got about 10 months ago - http://www.newegg.com/Product/Product.aspx?Item=N82E16817341049

I also looked around for some benchmarks and I should be getting close to around 60 FPS on BF3 and FC3. All I would have to do is just lower a couple settings I think.
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post #4 of 14
Quote:
Originally Posted by xzantos View Post

I also looked around for some benchmarks and I should be getting close to around 60 FPS on BF3 and FC3. All I would have to do is just lower a couple settings I think.

You should be able to get 60fps quite easily in BF3. FC3 on the other and i've found to be really demanding. I only get around 30fps with 2 x 2GB GTX670's in SLI @ 5760x1200.

Both games have settings set to maximum except for AA which is usually off/low
post #5 of 14
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Should my PSU be fine though? I'm not going to be doing it for another couple of months most likely or I might just wait till June when the 700 comes out.
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post #6 of 14
Quote:
Originally Posted by xzantos View Post

Should my PSU be fine though? I'm not going to be doing it for another couple of months most likely or I might just wait till June when the 700 comes out.

It should be fine, if you look at the test here, a LGA2011 GTX680 SLI system drew just under 600w of power.
Edited by Solidus82 - 3/26/13 at 4:30pm
post #7 of 14
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Quote:
Originally Posted by Solidus82 View Post

It should be fine, if you look at the test here, a LGA2011 GTX670 SLI system drew just over 300w of power.

biggrin.gif

Thanks
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post #8 of 14
Quote:
Originally Posted by xzantos View Post

biggrin.gif

Thanks

Sorry, I was looking at the wrong graph

A LGA2011 GTX680 SLI system drew just under 600w of power so you should be safe.
post #9 of 14
re: 2GB vs 4GB you should be fine BUT you may have to lower AA on some titles. So far in what I've tried out i only encountered problems with Skyrim and some mods i added to it. Had to turn off AA completely coz i maxed 2GB at 5760x1080

Here's a review of 670SLI vs 690 (with older drivers though from last year) LINK

and since the performance is so close... Here are more recent GTX 690 benchmarks using more recent drivers. LINK
post #10 of 14
Thread Starter 
Thanks for the links, I know I probably won't be able to have full AA and probably would have to lower it a notch or two.
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