SLI

[Deleted]

Hi all ,

Thought I would try SLI before one the GPU's goes in one of my other rigs.

Tried it but not getting any video out .

Can anyone see what I am doing wrong or if I should try something else ?

Thanks

Paul

[georgekokovinis]

Hi Paul,

Picture does not help.

Motherboard, VGA cards type / model. I would like to see a close up of the rear side of the vga's where connections are ( outputs ).

[Deleted]

MOBO is a Z490 Godlike
GPU 2 x KPE Kingpin 2080ti.
I tried the display port cable on both cards but nothing out of monitor .
Both cards seemed to be working , they both had OLED displays showing.

[Bones]

Could be a driver issue but not very likely - You should still get a picture on the monitor even if SLI itself isn't working.

Getting SLI to work can be tricky with some setups, driver issues along with the OS used is the most common problem I've ran into before.

Also make sure the correct input (Source) is in use by the monitor or you'll get exactly what you are seeing now.
Most monitors will select it automatically, a few won't and you'd have to select and set it manually in that instance.

[Macsbeach98]

Here is what I would do.
Take the second card out boot and run DDU and uninstall the display driver and shutdown.
Put the second card in attach your SLI bridge leave the monitor cable where it is in the first card.
Boot and you should have a display install the display driver reboot.
If all is ok and you have a display go into Nvidea control panel\SLI and enable 2 GPUs.

If after you put the second card in there is no display you might have to assign PCIe lanes in the bios in Z490 you will have to run both cards at 8x as their is only 24 lanes available on intel desktop only HEDT has 40 lanes although I wouldnt think you would have to if PCIe config is set to auto already it should automatically run them at 8x. 

[georgekokovinis]

www.wagnardsoft.com/

DDU - read carefully the instructions before use.

Best to use in safe mode.

And a stupid question - are the two cards installed in the correct pci-e slots ?
Is power supply sufficient ?

Output cable ( HDMI or Display port ) connected to first card on slot 1 ?

[osmiumoc]

Looks like you use 2x EVGA 1600W PSUs, how did you wire the GPUs up? Maybe try both on the same PSU.

[Vinster]

Like everyone noted

- try with 1 GPU and make sure you have video - Verify input on Monitor.
- Run everything with 1 PSU
- If nothing, do the fans on the GPU spin on boot? is there an error code on the Motherboard?
- - Is there a speaker on the Motherboard with any beep codes?

Once you have video with 1 GPU, add the second then and NV Bridge

- you don't change/move the video cable to the monitor

- Once in windows, open nVidia Control Panel and enable SLI.

- - Confirm with GPU-Z - Will show SLI Enable

Once in windows, See link, I just setup SLI with my 1080Ti's the location to enable SLI on the 2080Ti's is the same. there you can also see 2GPU's enabled shown in GPU-Z
warp9-systems.proboards.com/post/39989/thread

if you have to have 2 PSU's, then you need to make sure the DC Common and Start/On Signal on both PSU's are connected together. On older PSU's, this was easier when the cables were coloured then you could bridge/jump one of the black wires and the green wire.

Here is a jumper from New-egg for this purpose: www.newegg.com/battleborn-131106131282/p/35Y-000B-00009?Item=9SIA85V3DG9612&nm_mc=KNC-GoogleMKP-PC&cm_mmc=KNC-GoogleMKP-PC-_-pla-_-Data%20Adapters-_-9SIA85V3DG9612&gclid=Cj0KEQjwzZe8BRDguN3cmOr4_dgBEiQAijjVFgmCuhgUIFaTzN08YDT6ixnAPlpPIMjx4K_bMV4NVc4aAiTN8P8HAQ&gclsrc=aw.ds

Or you can get one from Add2PSU, they even have a version with an off-delay, this can keep the second PSU on for a few minutes once the system is off.

www.add2psu.com/

Hope that helps and breaks it down.

Vin

[Bones]

One more thing - Check the BIOS to see if it has an option concerning multi-GPU use, some boards do have that as a feature and if so make sure it's enabled.

[Deleted]

All sorted .
Removed both GPU's which are working fine and re seated .
Also re seated the bridge .
Not too happy about the results.
Got 32731 on Unigine Superposition (one of my favs) 1080P medium single card and only a couple of hundred higher on SLI.

[dr4g00n]

Jul 17, 2020 12:11:57 GMT -5 @spit said:

All sorted .
Removed both GPU's which are working fine and re seated .
Also re seated the bridge .
Not too happy about the results.
Got 32731 on Unigine Superposition (one of my favs) 1080P medium single card and only a couple of hundred higher on SLI.

Pretty sure superposition doesn't use SLI. Devs nowadays are usually too lazy to implement multi-gpu in their programs, which is a shame since it can actually work extremely well if done properly.