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Can an x8 pcie gen 4 slot run 4x gen 3 nvme

 
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post #1 of 7 (permalink) Old 02-12-2020, 12:29 PM - Thread Starter
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Can an x8 pcie gen 4 slot run 4x gen 3 nvme

Was looking at one of those asus 4x nvme cards that take up an x16 slot and was wondering if since x8 pcie gen 4 (but a physical x16 slot) has the same bandwidth as an x16 pcie gen 3, if i would be able to buy something like that asus card and throw 4x gen 3 nvme drives on it and they would all run at full speed?


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post #2 of 7 (permalink) Old 02-12-2020, 01:35 PM
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No. Use your gpu in the x8 slot. Use the m.2 card in the x16 slot.

If you plug a quad m.2 card into a x8 slot. It will run the ssds in x2 3.0 mode. Or it will only allow you use 2 ssds in x4 mode. Depending on how the card is made and/or your boards bios.

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Last edited by ozlay; 02-12-2020 at 01:43 PM.
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post #3 of 7 (permalink) Old 02-12-2020, 01:55 PM
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Your motherboard needs the option to set the PCIe slot to 4x4x4x4 bifurcation for those Asus Hyper m.2 cards to work with 4 drives.

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post #4 of 7 (permalink) Old 02-12-2020, 02:01 PM
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Nothing of the above works.
If you want an Asus hyper m2 card with 4 nvme disks you need to be certain that the pci slot you put the card must be x16 and that the motherboard supports bifurcation 4x4x4x4.
I say the above because i put the example above with 4 x adata 8200 and my GIGABYTE x570 was seeing only the 2 disks. I tried hard to make it work but it didn't no matter what i did.
It worked eventually but only when i removed anything from the 2nd pci slot because my motherboard specs was saying that if anything is puted in 2nd pci slot then 1st and 2nd Slots work x8 so Asus card wasn't working.
For me that was ok and i moved my gfx card to 3nd pci slot which controlled by my chipset but that pc is a homelab so it wasn't crucial for me but for anyone who has a good gfx card and his pc is a gaming machine for example this is a problem.

So to finish you need to be certain that the slot you put the card is x16 or it doesn't work.

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post #5 of 7 (permalink) Old 02-12-2020, 02:43 PM
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Quote: Originally Posted by ozlay View Post
No. Use your gpu in the x8 slot. Use the m.2 card in the x16 slot.

If you plug a quad m.2 card into a x8 slot. It will run the ssds in x2 3.0 mode. Or it will only allow you use 2 ssds in x4 mode. Depending on how the card is made and/or your boards bios.
yeah, more likely to only read half the disks than truncate them all down.

also, asus hyper only works on x299.

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post #6 of 7 (permalink) Old 02-12-2020, 03:01 PM - Thread Starter
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Quote: Originally Posted by ozlay View Post
No. Use your gpu in the x8 slot. Use the m.2 card in the x16 slot.

If you plug a quad m.2 card into a x8 slot. It will run the ssds in x2 3.0 mode. Or it will only allow you use 2 ssds in x4 mode. Depending on how the card is made and/or your boards bios.
Not talking about my GPU at all but i think you answered the question none the less

Quote: Originally Posted by Fluxmaven View Post
Your motherboard needs the option to set the PCIe slot to 4x4x4x4 bifurcation for those Asus Hyper m.2 cards to work with 4 drives.
Yeah I know it needs to support that feature but i didnt know if that even though it would only be an x8 electrically that it would be ok for the 4 drives since x8 pcie 4 has the same bandwidth as an x16 pcie 3

Quote: Originally Posted by bluechris View Post
Nothing of the above works.
If you want an Asus hyper m2 card with 4 nvme disks you need to be certain that the pci slot you put the card must be x16 and that the motherboard supports bifurcation 4x4x4x4.
I say the above because i put the example above with 4 x adata 8200 and my GIGABYTE x570 was seeing only the 2 disks. I tried hard to make it work but it didn't no matter what i did.
It worked eventually but only when i removed anything from the 2nd pci slot because my motherboard specs was saying that if anything is puted in 2nd pci slot then 1st and 2nd Slots work x8 so Asus card wasn't working.
For me that was ok and i moved my gfx card to 3nd pci slot which controlled by my chipset but that pc is a homelab so it wasn't crucial for me but for anyone who has a good gfx card and his pc is a gaming machine for example this is a problem.

So to finish you need to be certain that the slot you put the card is x16 or it doesn't work.
Yeah i was hoping since PCIE 4 is 2x the bandwidth that it would work out but it sounds like thats not the case. thanks

Quote: Originally Posted by skupples View Post
yeah, more likely to only read half the disks than truncate them all down.

also, asus hyper only works on x299.
The V2 card is not x299 only


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post #7 of 7 (permalink) Old 02-12-2020, 03:24 PM
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Quote: Originally Posted by skupples View Post
yeah, more likely to only read half the disks than truncate them all down.

also, asus hyper only works on x299.
Yeah, The hyper cards only read half the disks. But the expensive High-Point cards truncate them all down and don't require bifurcation. Basically they have a plx chip.

But not exactly what the OP is looking for.

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Last edited by ozlay; 02-12-2020 at 03:28 PM.
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