Vr2Io Posted July 11, 2019 Share Posted July 11, 2019 (edited) 11 minutes ago, fluisterben said: The x16 slot now has a card with 3 M.2 NVME SSD's, and the manual says the x16 slot will auto-switch to x8 when that (other) x8 slot is occupied. Not sure if the ssd card is using the full x16 bandwidth. Will have to check.. This will be interesting, I guess after insert the card, 3 M.2 would only detect 2 instead 3. ( You may verify by insert any PCIe card ) Edited July 11, 2019 by Benson Quote Link to comment
fluisterben Posted July 11, 2019 Share Posted July 11, 2019 9 minutes ago, Benson said: This will be interesting, I guess after insert the card, 3 M.2 would only detect 2 instead 3. ( You may verify by insert any PCIe card ) I don't think so, the PCI-E x16 slot is already set to x8/x4/x4 mode in BIOS. Check this mail correspondence I had with ASRockrack about it; > -----Original Message----- > Subject: RE: #ULTRA QUAD M.2 CARD# compatibility motherboard > > Hello, > >> My colleague from ASRock Rack borrowed me an E3C246D4U. >> The bifurcation settings that are available for the PCIe 3.0 x16 slot are: >> X16 >> X8/x8 >> X8/x4/x4 >> >> As far as I can tell, the C246 chipset does not support x4/x4/x4/x4. > > Is this not fixable by a workaround in BIOS? > Or truly a strict limitation of the hardware for C246 ? > >> I tested with an Ultra Quad M.2 Card on this motherboard, filled with >> 4 NVME >> M.2 SSDs. >> >> Set PCIE6 Link Width to x8/x4/x4. >> >> As expected, 3 out of 4 SSDs were detected (sockets M2_1, M2_3 and >> M2_4 on the Ultra Quad M.2 Card). > > OK, so I can run 3 of the 4 slots. At least that's something. > I was not aware of such strange limitations for a very current Intel chipset. > I truly don't understand these manufacturers of chipsets. > Why would you create support for x8/x4/x4, but not x4/x4/x4/x4 ? > Seems to me that's just some strange management decision, not an > actual hardware limitation. > > But hey, thanks a lot for this valuable info! > > Regards, Hello, I would think it is an artificial limitation built into the chipset/CPU, to differentiate between different price ranges/classes. To be sure I have asked ASRock Rack R&D to check. When I get a reply I will let you know :) Kind regards, ASRock Support Quote Link to comment
Vr2Io Posted July 12, 2019 Share Posted July 12, 2019 (edited) If bifurcation haven't 4444 option, then 1 M.2 should be detect if other slot insert a card, like a quad M.2 card can use three M.2 currently. Edited July 12, 2019 by Benson Quote Link to comment
fluisterben Posted July 12, 2019 Share Posted July 12, 2019 18 hours ago, Benson said: If bifurcation haven't 4444 option, then 1 M.2 should be detect if other slot insert a card, like a quad M.2 card can use three M.2 currently. That would be the case if it was logical division (x8 and x8 bandwidth divided over the x16 + x8 slots), but I don't think it is. I'll let y'all know what it ends up doing. 1 Quote Link to comment
tallguydirk Posted August 7, 2020 Share Posted August 7, 2020 On 7/12/2019 at 5:11 PM, fluisterben said: That would be the case if it was logical division (x8 and x8 bandwidth divided over the x16 + x8 slots), but I don't think it is. I'll let y'all know what it ends up doing. Hi - any update on this? Quote Link to comment
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