Im only using a single card. Whith a single card it supposed to be at x16 right?

and 2-way SLI x8/x8 ???

Although, in the MB specification, all 3 PCI are suppossed to be X16. Or im missing something?

Thanks for you response

the PCI-e slots on the motherboard will go to x16,  the processor needs to support that many lanes.

the 5820 supports 28 lanes instead of 40 like the 5930.  but if you only have a single GPU or a single PCI-e card installed then you should get the full x16 lanes, did you add any other PCI-e cards? like PCI-e Storage or USB etc ?

i have 2 gtx 980 sli'd

one at x8 one at x16

i'm not sure which slot which is in.  my 51 R2 came with a single 980 configured in the TOP most PCIe slot i added my 2nd GPU to the MIDDLE PCIe slot.

it could depend on which slot you have the card in i suppose.  as long as the x16 is the "PRIMARY" (where displays are attached) i would think you should be ok.

again with a single GPU which slots did you try.  also.

the  CPUz tool showed x8 on both GPU's where as the Tech Powerup GPU showed x16 on my primary gpu.

the lower end hazwell proc wont support that many pcie lanes. so the motherboard dumbs the x16's down to x8's if you use more than 28 lanes

if you go back to single GPU you'll get full x16 with the 5820 hazwell-e proc.  for SLI systems you should go with the 5930 which supports 40 lanes.

here is a good post outlining that on tomshardware

http://www.tomshardware.com/reviews/intel-core-i7-5960x-haswell-e-cpu,3918.html

the PCI-e slots on the motherboard will go to x16,  the processor needs to support that many lanes.     the 5820 supports 28 lanes instead of 40 like the 5930.  but if you only have a single GPU or a single PCI-e card installed then you should get the full x16 lanes, did you add any other PCI-e cards? like PCI-e Storage or USB etc ?   i have 2 gtx 980 sli'd   one at x8 one at x16   i'm not sure which slot which is in.  my 51 R2 came with a single 980 configured in the TOP most PCIe slot i added my 2nd GPU to the MIDDLE PCIe slot.     it could depend on which slot you have the card in i suppose.  as long as the x16 is the "PRIMARY" (where displays are attached) i would think you should be ok.   again with a single GPU which slots did you try.  also.     the  CPUz tool showed x8 on both GPU's where as the Tech Powerup GPU showed x16 on my primary gpu.

It´s strange for me, but its working at x16 in the middle PCI-E port . On the top port i tested with differents cards and im getting always x8.

Im only using a single GPU with i7-5820.

i know that the difference between x8 3.0 and 16x 3.0 is insignificant,but i´ll let the GPU in the middle port.

The question is, why the top pci-e port is always workign at x8 ? 

thanks for your responses

It shouldn't matter. Plug the DVI/HDMI/DP into the bottom card. Problem solved.

Actually I have a single card (GTX 980) and my CPU-Z says the same thing...

It´s strange for me, but its working at x16 in the middle PCI-E port . On the top port i tested with differents cards and im getting always x8.   Im only using a single GPU with i7-5820.   i know that the difference between x8 3.0 and 16x 3.0 is insignificant,but i´ll let the GPU in the middle port.   The question is, why the top pci-e port is always workign at x8 ?    thanks for your responses

The difference is significant for GPGPU applications.

In the configuration builder, there is a note regarding the PCIe lanes:

Important Details Electrical PCI-Express Specification Slot 1: x16 (or x8 if an Intel Core i7-5820K CPU is selected) Slot 3: x16 Slot 5: x8 (or x4 an if Intel Core i7-5820K CPU is selected)