Hello,
I recently impimented a Crossfire setup on my DFI Lan Party DK 790FX-M2RS (Link) which has 3 PCIE slots, two are used by the GPUs and one by a Creative soundcard.
Upon running GPU-Z it reported that one of the cards (Slot 2 for ref) is running at x8 instead of x16. My understanding of PCIe is limited but from the specs page it seems to indicate you can run 2 slots at x16 and one at x4 which would be perfect as the soundcard is happy from anything with x1 up.
GPU-Z Screen Cap
From device manager I got that;
GPU1 is running on Bus 4
GPU2 is running on Bus 1
Soundcard is running on Bus 2
Within the BIOS however it labeled
GFX1 (Sub options indicate this is a x16 port)
GFX3 (x8 port)
GFX4 (x16 port)
In an attempt to clear up the labeling difference I changed the speed of the x8 slot down to x1 to see if it flagged the change but the second GPU is still running at x8.
My knowledge is limited in this area so I don't know if the card could change the lane speed back up to x8 if it needed.
Any assistance would be appreciated as switching slots isn't and option due to physical clearance and I'm not even sure that is the issue.
I recently impimented a Crossfire setup on my DFI Lan Party DK 790FX-M2RS (Link) which has 3 PCIE slots, two are used by the GPUs and one by a Creative soundcard.
Upon running GPU-Z it reported that one of the cards (Slot 2 for ref) is running at x8 instead of x16. My understanding of PCIe is limited but from the specs page it seems to indicate you can run 2 slots at x16 and one at x4 which would be perfect as the soundcard is happy from anything with x1 up.
GPU-Z Screen Cap
From device manager I got that;
GPU1 is running on Bus 4
GPU2 is running on Bus 1
Soundcard is running on Bus 2
Within the BIOS however it labeled
GFX1 (Sub options indicate this is a x16 port)
GFX3 (x8 port)
GFX4 (x16 port)
In an attempt to clear up the labeling difference I changed the speed of the x8 slot down to x1 to see if it flagged the change but the second GPU is still running at x8.
My knowledge is limited in this area so I don't know if the card could change the lane speed back up to x8 if it needed.
Any assistance would be appreciated as switching slots isn't and option due to physical clearance and I'm not even sure that is the issue.