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WebMaximus

970s in SLI - what's your experience?

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With all discussions in various threads lately with very mixed results I would like to dedicate this thread to you guys running an SLI setup with 2 970s and hear what your experience is now with the latest Nvidia driver(s)? I read someone saying there seems to be a problem specifically with 970s in SLI in P3D while others report great results...very confusing!

 

First I was thinking going SLI hoping it would allow me to use 4xSGSS even when entering dense clouds without a serious FPS drop. I like to use SGSS to solve the bad AA seen without using SGSS when running P3D @ 1080.

 

I then learned my motherboard (Asus Maximus Formula VI) doesn't support SLI @ x16 but only x8 which made me consider maybe going for a single 980Ti instead. However today I learned that the difference running SLI @ x16 vs x8 is close to none so now I'm again considering an SLI setup since replacing my current 1st gen Titan card with 2 970s would be cheaper than a single 980Ti and still (I guess?) give me better performance as long as the SLI really works the way it's supposed to.

 

Another option would be to get a 4K screen which would allow me to skip SGSS all together and still have good AA but when I tried that in the past using with my current 1st gen Titan card it struggled quite a bit @ 4K so guess should I decide to get a 4K screen I would still need a new graphics card as well.

 

Speaking about 4K...would 2 970s in an SLI setup be able to run a 4K screen and still with good performance, anyone tried that?

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However today I learned that the difference running SLI @ x16 vs x8 is close to none so now I'm again considering an SLI setup since replacing my current 1st gen Titan card with 2 970s would be cheaper than a single 980Ti

 

I only have a single 970gtx. Running two of these in x8 slots wouldn't just have minimal impact, it would have none at all vs. x16. The 970gtx could never saturate pci3.0 x8 lanes, as its max bandwidth is lower than the x8 total bandwidth capability. I'm sorry I don't have the raw data at hand, but when my maximus vii x16 slot died, I ran in the x8 slot for a week with no degradation. Can anyone here confirm this with hard data? I'll be doing a second Evga 970gtx SSC when my new mobo arrives, as it looks like it will be more promising than a single 980ti. I'll be sure to report what I find out when it gets built.

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Thanks for your feedback and it was great to learn that having a motherboard not capable of running SLI @ x16 isn't a problem really.

 

Found this article which I also shared in another thread. It's a bit dated but since it hasn't happened that much since it was written I'm sure it's still perfectly valid and it clearly shows there's pretty much no difference at all with today's gfx cards whether the bus is running at x16 vs x8.

 

Are you able to use 4xSGSS with your single 970 when flying an advanced a/c such as the PMDG NGX or triple 7 and with ASN running in dense clouds?

 

Will be very interesting to hear about your result when you get another 970, looking forward to that and in the meantime I hope more people will report here about their experience and hopefully someone that is already running 2 970s in SLI.

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My experiences with SLi and the new driver are well documented - great results. I've been running my own profile with good results but the new driver (352) made it smoother and less FPS drop in heavy clouds and rain.

 

I tried a 4K monitor using my SLI and the 347 drivers - wound up sending monitor back - stuttered badly - really unflyable.

 

I usually run locked at 20fps with smooth results. Just for kicks I'm running unlimited - still smooth, visuals excellent. So far I can see no difference between 20 and unlimited except more FPS - which to me means nothing as it's not any smoother than running at 20. However, I don't see any downside to unlimited yet, like slower loading graphics etc.

 

IAC, for me - twin 970's have worked like a charm and continue to do so with the newer drivers.

 

Vic

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Thanks Vic, sounds great! And is this with SGSS?

 

I'm a little bit surprised you got so bad performance running at 4K though even in SLI.

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OK, that is really good to hear you're able to run 4xSGSS with your setup!

 

And this is with ASN running and flying through dense clouds in an advanced a/c such as the PMDG NGX?

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Hi, I am running windows 10 with a 5820 and 2 970 in sli. P3d runs very well, I don't need much AA with the 4K monitor, my game settings are:

 

MSAA   4     SSAA   0     FXAA   1         TBM=30  FPS=0    TexMaxLoad=30       I usually fly the superbug or A2A GA planes and use photoscenery with fullautogen trees ( from Nuvecta)    I have textures max 4096

 

The sim runs butter smooth between 35 -45 in heavy clouds and 40 - 60 anywhere else, with ASN.

 

I would say great bang for the buck using 970's and a 4K monitor. My monitor is a 40 inch 4K as well, so looks awesome.

 

Using 352.63 drivers

 

Hope that helps

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i am sure glad to hear that mark,i am running a 5820k at 4.5ghz, i have a single gtx 970 asus strix and just ordered a second one,my monitor resolution is 2560x1080,i had bought a 4k tv but because it was so big, its on the wall now lol,you may have confirmed i didn't waste my money on a second card. the m.2 ssd's are rolling out with read and write speeds of 1400+, i will be glad when those drop.

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OK, that is really good to hear you're able to run 4xSGSS with your setup!

 

And this is with ASN running and flying through dense clouds in an advanced a/c such as the PMDG NGX?

The most complicated I use is the Majestic Q400 - while not as heavy on the system as the PMDG, it still provides a load.

 

 

Vic

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Hi, I am running windows 10 with a 5820 and 2 970 in sli. P3d runs very well, I don't need much AA with the 4K monitor, my game settings are:

 

MSAA   4     SSAA   0     FXAA   1         TBM=30  FPS=0    TexMaxLoad=30       I usually fly the superbug or A2A GA planes and use photoscenery with fullautogen trees ( from Nuvecta)    I have textures max 4096

 

The sim runs butter smooth between 35 -45 in heavy clouds and 40 - 60 anywhere else, with ASN.

 

I would say great bang for the buck using 970's and a 4K monitor. My monitor is a 40 inch 4K as well, so looks awesome.

 

Using 352.63 drivers

 

Hope that helps

 

Thanks for your feedback. A little bit hard to know though how the a/c you're flying compare to the NGX which is known to be very hungry on resources.

 

Very interesting to hear how you have a butter smooth experience running your SLIed 970s @ 4K considering Vic posted above (in post #4) how he had to return his 4K screen due to severe stuttering but I guess as always YMMV depending on the combination of add-ons used, the combination of all your settings etc etc...

The most complicated I use is the Majestic Q400 - while not as heavy on the system as the PMDG, it still provides a load.

 

 

Vic

 

OK, I haven't any experience with the Q400 myself so can't compare it to the NGX but thanks for the info.

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I run 970's in SLI, in 4K. Mostly ORBX regions, and always with ASN. With PMDG in a FSX I can easily run at 20fps. Have not been able to test them in p3D due to a lack of extra cash lately.

 

The other night flying the Flysimware MU-2 in P3D, PAJN to A69, with real weather, lots of individual cloud layers, I occasionally dropped under 20fps. I keep it locked at 30. However I had MSI afterburner open on my other monitor and noticed that GPU 2 never went above 10% usage. Will have to fiddle around with my settings and post exactly what I'm using as I'm at work right now and can't remember them.

 

Oh yeah, i7-4790k, and 2 MSI GTX970 Twin Frozr cards, all at stock speeds. Haven't ventured into overclocking yet.

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I run 970's in SLI, in 4K. Mostly ORBX regions, and always with ASN. With PMDG in a FSX I can easily run at 20fps. Have not been able to test them in p3D due to a lack of extra cash lately.

 

The other night flying the Flysimware MU-2 in P3D, PAJN to A69, with real weather, lots of individual cloud layers, I occasionally dropped under 20fps. I keep it locked at 30. However I had MSI afterburner open on my other monitor and noticed that GPU 2 never went above 10% usage. Will have to fiddle around with my settings and post exactly what I'm using as I'm at work right now and can't remember them.

 

Oh yeah, i7-4790k, and 2 MSI GTX970 Twin Frozr cards, all at stock speeds. Haven't ventured into overclocking yet.

 

Probably your SLI is out of sync. Try to hit Alt+Enter key that should resolve it. Reason why this happens is if you go into the menu bar to change settings then one of the GPU´s will drop out. This is a known bug.

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Probably your SLI is out of sync. Try to hit Alt+Enter key that should resolve it. Reason why this happens is if you go into the menu bar to change settings then one of the GPU´s will drop out. This is a known bug.

 

I agree although it doesn't happen on all systems. I have never had SLI drop out for any reason but it has happened to some.

 

Vic

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I agree although it doesn't happen on all systems. I have never had SLI drop out for any reason but it has happened to some.

 

Vic

 

...and not every time. I noticed that changing some graphical settings it stays in sync whereas changing aircraft or airport it drops out. Anyway the workaround is to hit ALT+Enter key till one gets back into fullscreen mode.

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But this must be due to a setting somewhere or related to a certain software and/or hardware configuration.

 

I hate the idea of SLI in P3D being personal :wink:

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But this must be due to a setting somewhere or related to a certain software and/or hardware configuration.

 

I hate the idea of SLI in P3D being personal :wink:

 

Unfortunately it seems to be :S Did you watch my cloud test vid?

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Now that's scary :wink:

 

Haven't had the time to check out your video yet but will do when I get home from work tonight. Still though this is with 980s in SLI where I've been considering to get 2 970s so guess what I see in your video won't tell me much how the same thing would have looked using 2 970s.

 

I guess maybe the best thing I could do after all is finding somewhere where I can get 2 970s and return them if I'm not happy with the result. With all the various results posted and with SLI in P3D being personal I think that might be the only option to know for sure....

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i am suppose to get my second 970 today, so i will post my findings,i am gonna try and use robs settings from another post,either way, i play battlefield hardline,battlefield 4 and gta v, so i know i will benefit from that,by what i have read directx 12 and windows 10 will allow 2 videocards to be considered one large videocard, so 2 970's you would have 8 gigs of vram,i know current sli settings is not the case.

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Sounds great, looking forward to hear from you once you had a chance to try it out.

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my second gtx 970 came today, does it matter which slot the second card goes in a x99-A msi board? it doesnt look like the second card will fit right under the first.

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Brett, check your motherboard manual.  My GPUs are staggered and fortunately the two slots are 16X PCI 3.0 ... on an Asus Rampage V Extreme X-99.  Uses a slightly longer 2-way SLI interconnect.  

 

You'll probably not notice a difference between PCIe 2.0 and 3.0 slots and to be honest probably not notice a difference with 8X slots.  

 

Cheers, Rob.

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my second gtx 970 came today, does it matter which slot the second card goes in a x99-A msi board? it doesnt look like the second card will fit right under the first.

I would consult your motherboard documentation to find out if there are any differences between the PCIe slots.

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i have it all setup, for some reason i get a nvidia driver stops working sometimes,but with the 2 gtx 970's in sli with everything set on high and a notch above normal with no traffic on my 5820k,the 970 hits about 70% and alternates back and forth between the 2 gpu's with vram running just over 5gb.that was at a default airport with the pmdg 777 with asn and ftx global only, and about 2 dozen payware airports installed, so as far as i am concerned i think it was well worth the upgrade.you can enable an sli graph that shows how well the 2nd gpu has improved performance.it shows a green box on the left hand side of the screen.if the box is small it shows a small improvement, with the box getting longer vertical if you have a large improvement,mine looked to be between a 50-60% improvement in the above settings.in gta v i am able to pretty much max everything out at 60 fps.p3d for me holds about 50 fps for me, but i dont have the bars all the way to the right,the shadows seem to come out much more under sli.if only p3d could get the 64 bit upgrade, we could really get so much more with our current hardware.keep in mind i am running on an ultra wide monitor at 2560x1080,my next purchase will be a full 4k 28 inch monitor, but the budget is broke for me for a bit,i have spent almost 1,600 towards my 5820k and sli upgrade.so yes i think its worth it.the drivers do need to be better adjusted though.i seen a full 4k 28 inch monitor on ebay between 3 and 400 at 120hz,i believe it was a dell.i had my 4k tv hooked up but it ended up on the wall, the screen was just too big and i did not have a way to move it back from me.if anyone has suggestions about the drivers stopped responding, i would like to hear a solution.also because i am using a 5820k over a 5830 i think,i am limited to 28 pci lanes as the next cpu up is 40 lanes,so i am stuck at 8x 8x, with the 5830 or 5930, whatever the next one up is i could do 16x 16x.i am on a limited income so just having this was a big treat.

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I'm reading a lot of good and encouraging news here, I guess I'm going to jump in and grab that second 970ssc. Couldn't hurt right???

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