How does this work? Does the bios have to support the PLX application? I'm familiar with the theory of PLX, but how does this turn out in practice when it's not implemented directly on the motherboard?Update on my PLX work:
It does work with some Lanes missing (maybe bad BGA solder joints?)
Assembling took me a whole day though.
Lets see if I can make these available sooner or later.
Thanks for that insight. I have a slightly different use case than discussed here in that I’m interested in maximizing pcie slot availability for virtualization and device pass through (usb adapters and the like).On my x99 with x8x8 the GPUs ended up in separate IOMMU groups.
I suppose this would be the standard behavior.
that mobo does not support bifurcation. Only couple z270 mobo's supported it (mining mobo's with bios option for it).Hey guys, wondering if anyone could help me troubleshoot / debug my pci bifurcation setup:
MOBO: Gigabyte z270 WIFI Itx
GPU: EVGA 1080 ti FTW3
Other PCI card: Intel 10gbit card
When I plug it all up and boot into Windows, I can successfully see my 10gb pci card.
Using the onboard graphics, I cannot see my 1080ti in device maanger (it is connected to another monitor). I can't install nvidia drivers either (at least the one's I downloaded from the nvidia site, 435.xx).
I looked in hwinfo, and saw the 'gp(102)' (which is the code name for the 1080ti), but couldn't see it in device manager, and couldn't manually install the driver either.
I rebooted, and now I don't see the 1080ti in hwinfo anymore. Card does light up and spin fans on boot.
Any ideas would be much appreciated.
that mobo does not support bifurcation. Only couple z270 mobo's supported it (mining mobo's with bios option for it).
BIOS for this MOBO does indeed have the 2x8 PCI Split option. Anyway, I disassembled everything and laid it out on my desk trying different combos, (found I did have one bad riser, GPU wouldn't boot when it was connected through this riser to my MOBO, with no splitter).
Some more experimenting showed the following result:BIOS for this MOBO does indeed have the 2x8 PCI Split option. Anyway, I disassembled everything and laid it out on my desk trying different combos, (found I did have one bad riser, GPU wouldn't boot when it was connected through this riser to my MOBO, with no splitter).
After trying some some combos and risers and no risers and a different computer (to verify the GPU even still worked):
The splitter didn't like the gpu when I had a riser between them.
So, this setup did NOT work: mobo > 20cm riser > Splitter > 5cm riser > GPU.
But this setup DID work: mobo > 20cm riser > Splitter > GPU.
This is kind of annoying because I can't put my GPU into the bottom slot of the splitter, and use another riser out of the top slot (because the splitter is now trying to go into my Dan Case / mobo). So, I'll have to put the gpu in the 'top' slot, and a riser between the GPU and splitter in the bottom slot. I tried this, and it doesn't fit vertically due to the GPU's heatsink being very close to the slot, so I'm gonna file down another riser for the 10gb nic and make it sit deeper into the splitter, and hope that works.
Like this? http://www.ameri-rack.com/ARC2-PELY423-C7_m.htmlDoes anyone know of a bifurcated (x8x8) riser that's both rigid and flexible?
Basically, the idea would be to use a 905P (or any other HHHL card) along with a 2-slot GPU in an NCase M1.
The SSD would sit over the PCIe slot, with the graphics card one slot below it.
What I'm getting at, is something like this:
View attachment 189718
With the top part of this (but in x8) attached to the left side of it it:
View attachment 189719
I looked around, but can't seem to find anything like that.
I already have exactly that in an A4-SFX, see here, but that's not what I mean and doesn't fit the purpose, unfortunately.
Upward risers do exist, just not bifurcated ones.Just so you know low profile cards have a bracket that turns the opposite way from a full slot bracket. Which is probably why that doesn't exist (as far as I know)
Edit: Cool idea though, that would be awesome if that existed!