Master of Cramming
- Jun 29, 2016
Looks awesome! No progress on the riser yet; I've been juggling a few other things. I really need to structure my time more effectively so that I can get back on it.Did you make any progress ?
I designed a custom enclosure around my dual-slot riser.
Looks way cleaner than the Amerirack one, while I trust good old PCB traces rather than a PCIe ribbon to feed my two 1070s with 12V.
Works like a charm
Some close up preview picture ; I'll do a proper thread later on.
Not an expert in this area, sorry manQuestion regarding the STRIX Z370-I Gaming :
this mobo is supporting Bifurcation through their Hyper M.2 X16 card, which can carry up to four M.2 drives.
Manual specifies two possible PCIe configurations :
- two drives : x4 + x4
- tthree drives : x4 + x4 + x4
Any chance the PCIe slot could be configured in x8 + x8 ?
Contact AsRock pre-sales support and straight-up ask?Been scouring around to confirm this, if anyone can verify for me that would be greatly appreciated.
Does the asrock b350 itx motherboard have bifurcation support for dual gpus (2 x 1070's)? Or does this only work on the x370 version?
PCI-E works in groupings of lanes, x1, x2, x4, x8, and x16. (Maybe x32 and beyond is technically a thing, but it doesn't really matter here.)From what I can understand by myself and after plenty hours of research, is it because Asus motherboard use a second M.2 slot for NVMe?
AsRock can use all 24 lanes at once. PCI-E 3.0 x16 (16 lanes), USB 3.1 Gen2 (4 lanes) and M.2 (4 lanes)
Asus have one M.2 NVMe/Sata port more so it is 4 extra lanes of use. When you have connected 2 M.2 NVMe SSD's your device on x16 slot is working in x8 mode (if i correctly understand my native language)
So, if x16 slot is working in x8 mode when you connect 2 NVMe drives, is it not a bifurcation? Correct me if I'm wrong. Can not we bifurcate x8 to 2 x4? If we install 1 NVMe drive or none of them, aren't we possible to bifurcate x16 to 2 x8? It's a silly move Asus...
(sorry if it stupid but I'm newbie in bifurcation)
I am not qualified to give you a certain answer, so definitely keep looking if you want to have confidence... but my understanding is that if your board supports bifurcation it should not matter what the two devices you're using are. I don't know whether bifurcation is able to split into more than halves--x16 into x8+x8, or x8 into x4+X4, rather than x16 into x8+x4+x4, etc--but I don't see any reason why a GPU using x8 and a NVMe drive using the other half (I think they only use up to x4) should not work.Is the bifurcation limited to splitting the signal between similar data types, or is this more of a manufacturer/BIOS limitation than a physical limitation of the standard?
A bifurcating riser will split the PCIEx16 traces into x8/x8. AFAIK you can then theoretically run any* PCIE devices off those two slots as up to electrically x8 devices.I'm curious; I was looking at the ASRock Fatality mITX motherboard and noticed that it supported Bifurcation which makes me wonder, is it possible to run something like a graphics card and a bootable NVMe SSD on a birfucating riser? Is the bifurcation limited to splitting the signal between similar data types, or is this more of a manufacturer/BIOS limitation than a physical limitation of the standard?
The ASRock Motherboard in question only has 1 NVMe slot, so the question is more of a hypothetical use case where I'd be combining an Optane accelerator drive for a standard HDD storage drive with a boot NVMe SSD on the PCI riser. It's an edge case for sure, but it's not really clear from what I've read if this kind of use has really been considered seriously, particularly since a lot of the results on Google go either back to this thread or to bifurcation riser cards rather than actual specs on the specific capabilities or use cases aside from SLI/Crossfire.
Currently running a 1080Ti + NVMe 960Pro (as a boot drive) off of a bifurcated riser, I can confirm this works - but as stated above, it requires explicit BIOS support, an actual option you can toggle to turn it on or off.I'm curious; I was looking at the ASRock Fatality mITX motherboard and noticed that it supported Bifurcation which makes me wonder, is it possible to run something like a graphics card and a bootable NVMe SSD on a birfucating riser? Is the bifurcation limited to splitting the signal between similar data types, or is this more of a manufacturer/BIOS limitation than a physical limitation of the standard?