480 gtx and SLI

[pmt411]

I have replaced my two 260 cards with two 480gtx cards but I cant get them to work now in SLI. I cant figure out what the problem is. Could it be I need a new motherboard?? I have an Evga 790I. The two 260s worked fine in SLI and I put the two 480s in the same slots, do I need to put them in different slots??

 

[shadow187]

What's your power supply?

 

[pmt411]

I have a sliverstone 1500

 

[pmt411]

Can anyone give me a clue as to whats likely wrong??

 

[aaron686]

As stated above, whats your psu? Make sure all connectors are in place, the GTX480 uses 6-pin and 8-pin connectors so therefore for SLI you would require 2 6-pins and 2 8-pins for your configuration to work, also check the settings in the drivers and of course, update if necessary. Good Luck!

 

[pmt411]

As stated above, whats your psu? Make sure all connectors are in place, the GTX480 uses 6-pin and 8-pin connectors so therefore for SLI you would require 2 6-pins and 2 8-pins for your configuration to work, also check the settings in the drivers and of course, update if necessary. Good Luck!

I have the Silverstone 1500w power supply. I have used the two eight and six pins. I have enabled sli in software through the Performance gidget from Nvidia. I just cant figure out what is the problem.

 

[aaron686]

That PSU is perfectly fine and that shouldn't be the problem. Did you use different SLI bridges for both configs? try swapping sli bridges. Or try using one GTX480 at a time in different slots to see if anything is going on with your board. Thats all I got Bios settings maybe?...Good Luck...