SLI help GTX 1080

[Matgarciaz]

Alright, where do I begin... so, I have 2 GTX 1080s. DIFFERENT MANUFACTURERS one from MSI and the other is NVidia founders edition. (Bought them at different times. I bought the MSI GPU first) My MSI one seems to be thicker than the founders edition so an HB wont fit and it wont be able to reach the founders edition. So I'm using 2 SLI ribbons. Anyway, in the games that I'm playing I've seen huge drops in FPS other than WoW... other games that I play are: Rainbow six: Siege, H1Z1, Resident Evil 7, Battlefield 1 (Not tested yet) , Dark Souls 3, etc. But I seem to only get 45-50 fps during SLI. When I played with one I'd get 60-85 FPS. That's a huge drop. I play on 4k, I have an i7 6700K OC cpu, 32 gigs of ram, 2 SSDs, 1 TB hard drive. Overall a great rig. I don't know what I did wrong. Temps are fine. I tried overclocking the GPUs but I don't have a good OC yet. I tried all over google. At first I thought it was the bridge because I was only using one before but now I'm using 2. I figured I'd try here now because I know Linus is smart as hell and maybe someone who watches his videos can help. Anyway, thanks in advance - mat

 

 

If you'd like pictures of the current rig, I can add pictures later.

[AlwaysFSX]

You need to use a High Bandwidth bridge, not two flexible ones.

[Matgarciaz]

3 minutes ago, AlwaysFSX said:

You need to use a High Bandwidth bridge, not two flexible ones.

I don't think that can be possible due to the gap. If you can figure it out, then by all means, let me know lol. I tried using an PCIE riser but it doesn't fit into the gpu

[Matgarciaz]

Here's what I tried to buy

[TechyInAZ]

Too bad you can't sell that FE and get another MSI card.

[Matgarciaz]

Just now, TechyInAZ said:

Too bad you can't sell that FE and get another MSI card.

I can try to return in back to Newegg. I mean, I just bought it like 2 days ago. It's still fresh.

[PCGuy_5960]

11 minutes ago, AlwaysFSX said:

You need to use a High Bandwidth bridge, not two flexible ones.

Nope

 

[Matgarciaz]

Bump, anyone wanna tell me what I'm possibly doing wrong?

[AlwaysFSX]

23 minutes ago, PCGuy_5960 said:

Nope

If you don't frame times can get all screwed up and cause performance issues, you really should.

[PCGuy_5960]

5 minutes ago, AlwaysFSX said:

If you don't frame times can get all screwed up and cause performance issues, you really should.

You didn't watch the video, did you?

Watch this:

 

[AlwaysFSX]

Just now, PCGuy_5960 said:

You didn't watch the video, did you?

Watch this:

No because I looked at testing when the 10 series came out with the HB bridge, yes you can avoid it but sometimes stuttering will happen because you're not using it.

[PCGuy_5960]

4 minutes ago, AlwaysFSX said:

No because I looked at testing when the 10 series came out with the HB bridge, yes you can avoid it but sometimes stuttering will happen because you're not using it.

No, in the video he said that 2 flex bridges work just as well as 1HB bridge

And yes, he did find that 1 flex bridge can cause issues with performance

[Matgarciaz]

1 minute ago, PCGuy_5960 said:

No, in the video he said that 2 flex bridges work just as well as 1HB bridge

And yes, he did find that 1 flex bridge can cause issues with performance

Guys... I just need to know what I'm not doing right.

[Mick Naughty]

Need pics on system monitoring while in valley/heaven. Info of what the gpus are doing. Then we can move onto a game.

[Matgarciaz]

4 hours ago, Mick Naughty said:

Need pics on system monitoring while in valley/heaven. Info of what the gpus are doing. Then we can move onto a game.

So far this is whats going on with Haven, for some reason its crashing. With 4k AA off I'm getting around 58-60 FPS. It freezes periodically (It might be my OC). But I should be getting far more than just 60FPS at 4k. I should at least be getting 80+ no?

[Janner558]

With SLI you rarely get what you expect, it all depend on the driver support. I have see reviews were the gains have been anywhere from -5% to 60% fps gains depending on what title was being run.

what were you getting in haven with just one 1080?

[Mick Naughty]

Well you can't blame sli or a poor setup or execution. If you are having issues, the over clocks need to be off. All default settings. 

The cards aren't trying. Need to fix the mobo settings, nvidia if you messed with any of them and do a clean install of the drivers. 

 

Isnt an sli problem. 

[Matgarciaz]

8 hours ago, Mick Naughty said:

Well you can't blame sli or a poor setup or execution. If you are having issues, the over clocks need to be off. All default settings. 

The cards aren't trying. Need to fix the mobo settings, nvidia if you messed with any of them and do a clean install of the drivers. 

 

Isnt an sli problem. 

Okay, I'll do a fresh install. I didn't mess with any of the mono settings. The only thing I did was enable OC mode for my CPU. Which was when I was running 1 GPU. With no OC I get 30 fps. I'm upstate right now so I will get back to you when I change the settings. But I will set mobo to default settings. How do you know the cards aren't trying? 

[Matgarciaz]

15 hours ago, Janner558 said:

With SLI you rarely get what you expect, it all depend on the driver support. I have see reviews were the gains have been anywhere from -5% to 60% fps gains depending on what title was being run.

what were you getting in haven with just one 1080?

With rainbow six siege I had anywhere from 58/60fps -85 fps

[othertomperson]

On 06/04/2017 at 6:13 PM, AlwaysFSX said:

You need to use a High Bandwidth bridge, not two flexible ones.

That's not true at all. A HB bridge might have slightly lower latency owing to the traces being exactly the same length (while this isn't true of the flexible bridges), but the difference is small enough that the Nvidia driver cannot tell the difference.

 

In fact according to Nvidia themselves you only need a HB bridge (of any description) for resolutions including and above 5K at all, and seeing people test on YouTube reveals the difference to be mostly aesthetic anyhow.

 

So if you cannot use an HB bridge for any reason don't feel particularly bad about using two flexible bridges. This is good news in general because more than half a year on a lot of countries (including the UK) are still only now starting to get some HB bridges in stock.

 

Edit: Christ at least put the open air cooler on the bottom and giver the blower the restricted air gap!!

[Matgarciaz]

3 hours ago, othertomperson said:

That's not true at all. A HB bridge might have slightly lower latency owing to the traces being exactly the same length (while this isn't true of the flexible bridges), but the difference is small enough that the Nvidia driver cannot tell the difference.

 

In fact according to Nvidia themselves you only need a HB bridge (of any description) for resolutions including and above 5K at all, and seeing people test on YouTube reveals the difference to be mostly aesthetic anyhow.

 

So if you cannot use an HB bridge for any reason don't feel particularly bad about using two flexible bridges. This is good news in general because more than half a year on a lot of countries (including the UK) are still only now starting to get some HB bridges in stock.

 

Edit: Christ at least put the open air cooler on the bottom and giver the blower the restricted air gap!!

okay good to hear I don't have to return the card. I just don't know what's wrong. And hmm I'll do that too

[Mick Naughty]

4 hours ago, Matgarciaz said:

Okay, I'll do a fresh install. I didn't mess with any of the mono settings. The only thing I did was enable OC mode for my CPU. Which was when I was running 1 GPU. With no OC I get 30 fps. I'm upstate right now so I will get back to you when I change the settings. But I will set mobo to default settings. How do you know the cards aren't trying? 

The program you screenshot shows gpu usage, which needs to be 95%+ in the benchmarks.

Need to ensure the the pc in on performance mode in the bios mode. Turn sli off and run valley or heaven and ensure that the single card will hit 95%+ so we know what direction to go in next.