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Dual Cards vs SLI

post #1 of 7
Thread Starter 
In my previous build I was running 2x GTX 570s with nVidia 3D surround on 3 monitors, I loved having 3 displays but I was rarely playing anything in surround never mind 3d surround. I parted out most of my rig to build a smaller form factor build and sold my 3 3d monitors and invested in a Catleap. But I missed having multiple monitors. I found myself with a second 670, but when they're in SLI my performance is almost worse then when using a single card as I like to play on my main screen and have stuff open on my other web browsers movies tv shows whatever.
So my question is if I'm not running in SLI is there a way to force programs to use the 2nd card, or is running two cards not in SLI completely useless. If the later is true then I'm probably going to upgrade to a 780 when that comes out.


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post #2 of 7
Sorry, I'm a bit confused by the wording of your post. Are you currently running a 570 and a 670? That shouldn't be possible AFAIK but maybe I'm just crazy. Anyways, assuming you are running two 670's, what exactly do you mean by "the performance is almost worse." Raw fps? Stuttering? You should take a look at your drivers since two 670's are in theory almost twice as fast as one 670.

In general when running separate cards (if you remove the SLI bridge), you can plug in monitors into different cards etc, but you won't be able to use both cards for a single task. Certain programs however, will then be able to use distinct GPU's on demand. My cards are AMD so I can't comment on how to configure this using the NV control panel though.
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post #3 of 7
I've run a GTX 260 and a 8800 GTS 512 in the same rig and used them both to fold.

However they will not work together and there is no point in doing it for games.
post #4 of 7
I wanted to run each of mine on separate monitors when I first got them but as per my monitoring programs it would show my first card doing all of the work for what was showing on my second monitor. I threw a fit. So xfire it was to be and for no reason as games i play still dont use dual cards..
post #5 of 7
Thread Starter 
Sorry to clarify I sold the two 570s and now have two 670s

Yes I'm seeing lower fps and stuttering drivers are up to date.
I prefer to play in windowed mode and I'm sure that is the reason for the poor performance. I also notice that the two cards have different bios versions is this something I should fix?
I know the GTX 600 series can support 3 monitors on a single card.
But the main question is in general is I'm not running the two cards in SLI is there any point in actually running the two cards.

I also figure the best upgrade I could do would be to goto a single card with simply mor VRAM



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post #6 of 7
No, if you're not running them in Sli there is pretty much no reason to have two card, even if the second 670 is physx only. Two 670's in Sli should perform fantastic, make sure you are properly installing new drivers via this guide: CLICK . Make sure to force core parking off when gaming and optimize your profiles in Nvidia control panel. I have two 580's and a 2700k with HT on and I have absolutely no microslutter in SLI.

P.S. If you do choose to upgrade to say a 780 GTX, it should be for the increase in GPU memory, because two 670's will outperform a 780 GTX; I can pretty much guarantee that (pending the release).
post #7 of 7
Quote:
Originally Posted by griffulas View Post

Sorry to clarify I sold the two 570s and now have two 670s

Yes I'm seeing lower fps and stuttering drivers are up to date.
I prefer to play in windowed mode and I'm sure that is the reason for the poor performance. I also notice that the two cards have different bios versions is this something I should fix?
I know the GTX 600 series can support 3 monitors on a single card.
But the main question is in general is I'm not running the two cards in SLI is there any point in actually running the two cards.

I also figure the best upgrade I could do would be to goto a single card with simply mor VRAM



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Yeah, so that should obviously not be happening. Again, it's either driver config issues, unstable OC (if that's what you're doing), or faulty hardware. If you are sure the drivers are good and that you're not OCing, test each card separately (only one card in the system at a time) in furmark and see if you get any artifacting. If one card artifacts or crashes, that would be indicative of a hardware issue. Otherwise, you just have to try different drivers/make sure you have cleaned out the old ones appropriately.

Also, I presume that you are running those 670's on the 1200w psu, not the 450w, because 450 is really pushing it for a SLI setup.
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