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7800 SLI not working

Tommiho

Tommiho

Tommiho

Associate
Joined
5 Nov 2005
Posts
51
Guys,
new to SLI however theoretically prepared.
Just put together 2x 7800 GT from BFG.
Installed the latest driver for both the system and card. Fitted the card to the lower slot. Bridged them together.
Monitor is connected to the one which has been there before.
Restarted the PC. But no pop up window to allow SLI appeared.
Card is running, is powered properly and my system should be SLI ready.
Both cards are identical.
So if anybody who is not tired to answer questions about 7800 sli can help would be much obliged.
Thanks very much
 
Is your mobo SLI compatible? What is the chipset?

EDIT: Sorry, didn't notice the sig. What made you choose 7800GTs? Why not a faster single cards?
 
Last edited:
Have you got the latest driver from nvidias website?

Are you on XP or vista?

Does 7800GT apprear twice in device manager

Go into the nvidia contol panel and see if theres an option to enable SLI.

Does your mobo require a paddle to be switched to allow SLI or is it automatic in the bios?
 
Monkeynut said:
Is your mobo SLI compatible? What is the chipset?

EDIT: Sorry, didn't notice the sig. What made you choose 7800GTs? Why not a faster single cards?
Click to expand...

I just had an 7800GT on my system and I got another 7800GT quite cheap.
The whole rig is 2 years old. So I am gonna stick to it and probably will buy a whole new beast in the near future :D
 
i have the same motherboard, but don't have sli.

from what i remember though, there is a jumper setting on the motherboard which you have to change for sli to work...? :confused:
 
MeatLoaf said:
Have you got the latest driver from nvidias website?

Are you on XP or vista?

Does 7800GT apprear twice in device manager

Go into the nvidia contol panel and see if theres an option to enable SLI.

Does your mobo require a paddle to be switched to allow SLI or is it automatic in the bios?
Click to expand...

Yes I installed new drivers prior to additional card installment.

I am on XP.

Device manager actually shows two cards. It didn`t occurred me to check upon it, although it should be first thing to look at ehm.

I was looking through various options in nVidia control panel but wasn`t lucky. I will take a look again. Maybe I just missed it.

I thought that XP should detect any additional hardware without going to the BIOS. I haven`t peeked in it but I will do that if there is an option to enable SLI.
 
Guys thanks very much for answers. I am gonna try to look in to the bios, will reinstall cards again check the Mobo manual and nVidia control panel.
But I should be on the right track I guess as the device manager detects them both. So hopefully it is just a case to activate that SLI.
 
Sounds like the bios is setup correctly as its detecting both cards in device manager.

To get to the SLI bit in the drivers, right clock on desktop, then personalise, then display settings, advanced, the the Geforce 7800 tab at the top, start control panel and on the left panel you should see an option that says SLI multi GPU. Should find the option there.
 
MeatLoaf said:
Sounds like the bios is setup correctly as its detecting both cards in device manager.

To get to the SLI bit in the drivers, right clock on desktop, then personalise, then display settings, advanced, the the Geforce 7800 tab at the top, start control panel and on the left panel you should see an option that says SLI multi GPU. Should find the option there.
Click to expand...

Well I couldn`t find the SLI enable option there.

I have reinstalled both MoBo and Graphic drivers, but it didn`t help. Hm I did even swap them in the slots but it doesn`t seem to have any effect ont the SLI to work.
I have checked MoBo manual and there are no jumpers resetting.
System detects both cards but it doesn`t say if I am running the SLI or not. Do not know how to find out, because nVidia control panel doesn`t say. Games deem to be running the very same way.
Hm not sure what to try now. Maybe change of bios? But it works now so there must be something else.
Anyway thanks all for your help.
 
You should have something like one of these 2 images depending on the drivers/card(s), etc.

http://aten-hosted.com/images/sli1.jpg
http://aten-hosted.com/images/sli2.jpg

If that option is not in the left hand navigation pane then the drivers haven't seen your system as being SLI capable - I'd double check the SLI configuration for the motherboard many of them have a jumper to enable/disable SLI support even if they have the flip card or a switch in the BIOS - according to a quick look on google you have to swap 6 blocks of jumpers over on the DFI LanParty UT NF4 SLI-D boards...
 
Rroff said:
You should have something like one of these 2 images depending on the drivers/card(s), etc.

http://aten-hosted.com/images/sli1.jpg
http://aten-hosted.com/images/sli2.jpg

If that option is not in the left hand navigation pane then the drivers haven't seen your system as being SLI capable - I'd double check the SLI configuration for the motherboard many of them have a jumper to enable/disable SLI support even if they have the flip card or a switch in the BIOS - according to a quick look on google you have to swap 6 blocks of jumpers over on the DFI LanParty UT NF4 SLI-D boards...
Click to expand...

That`s it probably. :) I have found the article and I checked those blocks and they are indeed in position normal. So I am gonna try to switch them over and will see what`s gonna happen than.

Thanks very much
 
Yes you need to flip all those jumper blocks between the two gfx card slots

LPUTNF4SLIDR-SLI2.jpg


You should have chip extractor tool, grab each end of the block with the two hooks and pull, then set them onto the other set of pins. The slots change from 16x and 1x into 8x and 8x.

Richie.
 
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