Yet another SLI bridge not detected.

[Iron Butterfly]

Hi tech gurus,

 

I just bought a new 980ti hoping to pair with my older one, but seems like SLI is not working. Nvidia Control panel says bridge not connected.

 

Both cards are Asus Nvidia GeForce GTX 980 Ti, (One is OC Edition - older one, other is Gaming Edition - new one). I have tried with two different SLI bridges (and even a 3 way SLI on 2 way to test). I use to run SLI before with cards from 3 different manufacturers with no issue. I can mine with both cards comfortably so no issue with cards. But my main objective is gaming.

 

Bus Interface is the only possible difference I can see on GPU-Z:

1. PCIe x16 2.0 @ x16 2.0
2. PCIe x16 2.0 @ x16 1.1

 

Default clocks also slightly different: (Difference in editions)

1. GPU: 1190 ; Memory: 1800 ; Boost: 1291
2. GPU: 1000 ; Memory: 1753 ; Boost: 1076

 

Is the trouble caused by ASUS GPU Tweak II software? How do I forcefully make the clock equal? I am unable to bring down the OC edition low enough to match the gaming one. I don't want to over clock gaming one too much.

[CryptoMatt]

Honestly SLI won’t improve gaming performance, only in a few games that support SLI, you where better off spending that 980ti money on another upgrade, if you bought it to only mine then sure but to game that was a bad idea.

 

test the bridge with other cards if you can, maybe the bridge port is broken on one of the cards 

[stealth80]

not all Maxwell cards were SLI compatible, It might be worth flashing the bios for one of them as I had issues with 2x EVGA 970's 

[porina]

I've SLI'd mismatched 980 Ti's without problem. The only thing I remember doing same previously with 960's was that the connector on the card sometimes has a bit of wiggle room, and pushing the SLI connector around a bit might find a position where it works.

[IsaacThePooper]

try flipping the bridge upsidedown

[19_blackie_73]

does your mobo support sli?

[Frankenburger]

1 hour ago, CryptoMatt said:

Honestly SLI won’t improve gaming performance, only in a few games that support SLI

Plenty of games support SLI and a good number of them scale well. I agree it isn't worth it on older or lower end hardware, but perpetuating bad information doesn't help anyone.

[Curufinwe_wins]

1 hour ago, CryptoMatt said:

Honestly SLI won’t improve gaming performance, only in a few games that support SLI, you where better off spending that 980ti money on another upgrade, if you bought it to only mine then sure but to game that was a bad idea.

Llol what? No. Just no. Basically all AAA titles support SLI (with 50%+ scaling). Sure you can make the argument that trying to sell the current 980ti and grabbing a 1080 "MIGHT" be better, but most of the time on any title that is actually demanding it won't be.

1 hour ago, stealth80 said:

not all Maxwell cards were SLI compatible, It might be worth flashing the bios for one of them as I had issues with 2x EVGA 970's 

All 980ti's are sli compatible with each other.

 

1 hour ago, Iron Butterfly said:

snip

If you use a program like MSI afterburner, you should be able lock the clocks to the lower of the two. Have you tried using each set of fingers? And/or using both together?

Example below:

 

 

Other troubleshooting steps recommended you can follow from this https://rog.asus.com/forum/showthread.php?83747-Asus-Strix-GTX-980-ti-Sli-Sli-bridge-not-detected

 

Basically swap shit around (cards and all) until you see a version that recognizes. Sucks, but basically the best thing to do since Asus support is legendarily terrible.

[Iron Butterfly]

MSI Afterburner won't synchronize between them because Device ID is different:

1. 10DE 17C8 - 1043 855B
2. 10DE 17C8 - 1043 855C

 

BIOS version is different, where do I get the bios?

1. 84.00.4B.00.03
2. 84.00.4B.00.04

The motherboard does support SLI, I use to do SLI with my older cards (before I sold them off two years ago).  I have also flipped the SLI bridge to no luck.

[Iron Butterfly]

Finally got it working; I had to flash the bios (even though they were same before I did); I guess the issue was with Spyder 4 Colorimeter, but not sure.

[Curufinwe_wins]

On 12/31/2017 at 10:38 AM, Iron Butterfly said:

Finally got it working; I had to flash the bios (even though they were same before I did); I guess the issue was with Spyder 4 Colorimeter, but not sure.

Good to hear. Yeah I had two different versions at one point and they worked fine, but I did end up flashing one to the other when I put them under water.