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EVGA 980ti Classified SLi PCI-E Bandwidth issue

post #1 of 2
Thread Starter 
System info :
EVGA X99 Classified E-ATX motherboard
Intel 5930k custom water loop
16gb G. Skill 2666 DDR4 RAM
EVGA SuperNova P2 1000w power supply
2x EVGA 980ti Classified


I installed 2x EVGA 980ti Classified GPU's. They are installed in slots 1 and 4. These are the proper slots for 2way SLI on this board and they should be x16/x16 with the 40 PCI-E lanes. I have the extra 6 pin power plugged into the motherboard for the PCI-E slots. For some reason slot 1 is reading 3.0 x16 but slot 4 is reading 3.0 x8. Why is slot 4 x8 and not x16 like it is suppose to be?? Is it that the GPU just can't use the bandwidth ? I tried pushing the cards with Heaven benchmark, 3d Mark and it stayed at x8. When I had my 780ti's in they always read x16 on both slots. Any help or input would be appreciated!!!
post #2 of 2
Quote:
Originally Posted by GunSurgeon View Post

System info :
EVGA X99 Classified E-ATX motherboard
Intel 5930k custom water loop
16gb G. Skill 2666 DDR4 RAM
EVGA SuperNova P2 1000w power supply
2x EVGA 980ti Classified


I installed 2x EVGA 980ti Classified GPU's. They are installed in slots 1 and 4. These are the proper slots for 2way SLI on this board and they should be x16/x16 with the 40 PCI-E lanes. I have the extra 6 pin power plugged into the motherboard for the PCI-E slots. For some reason slot 1 is reading 3.0 x16 but slot 4 is reading 3.0 x8. Why is slot 4 x8 and not x16 like it is suppose to be?? Is it that the GPU just can't use the bandwidth ? I tried pushing the cards with Heaven benchmark, 3d Mark and it stayed at x8. When I had my 780ti's in they always read x16 on both slots. Any help or input would be appreciated!!!

Running a GPU in X16 and X8 doesn't hurt performance at all, even if, it's barely noticeable at all. FPS in games won't change either.
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