The usermanual for the asus rog strix B850E mainboard says:
GPU mounted in PCIEX16(G5) slot running will run x8 instead of x16, if either M.2_2 or M.2_3 slot is operating.
I intend to mount the GPU in the G5 PCIe slot so both the M.2_2 and _3 slots would be non existent because even if the performance difference from x8 and x18 is minor, i would prefer operating the GPU @ x16. So both the M.2 slots would be entirely useless, which i an argument against purchasing the board offering those additional M.2 slots that i wouldn't use anyways.
Additionally the M.2_4 slot will be disabled when i'm operating my soundcard via PCIEX16(G4) slot, so that makes another M.2 slot entirely useless.
However, the M.2_1 and M.2_5 slots would both remain operational while both the PCIEX16(G5) and PCIEX16(G4) are in use, without bandwidth conflict between any of these slots.
Did i get this right or no?
The specificationpage for the asus B850E also says this:
Specifications vary by CPU types.
And what the hell does this mean exactly? I intend to combine the board with the amd 9800X3D processor. So what would be the outcome of that?
The other mainboard i'm considering is the asus B850A. This board shows only very little information about connectors with shared bandwidth.
The usermanual says only this: When PCIEX16(G4) slot is operating, M.2_3 will be disabled.
So in my case where both PCIE G5 and G4 slots would be operating (one gpu + one soundcard) the M.2_3 slot would be disabled, however the other M.2 slots, _1 and _2 and _4 all three of them would remain operational without affecting the bandwidth of neither G4 or G5 PCIE slot.
PS: The specs page for this board also notes that specification vary by CPU types.
And i've got no idea how to find out exactly what that means for my specific cpu.
Did i get this right or no?
My conclusion: the B850E "extreme" offers few more slots compared to B850A but for my usecase (gpu + soundcard) the B850E would only offer me two operational M.2 slots or otherwise i would compromise bandwidth of either G4 or G5 PCIE slots, while the B850A would offer me three rather than two operational M.2 slots without affecting G4 or G5 PCIE bandwidth.
Did i get this right or no?
PS: The specs page under the expansion slots section for both boards shows a link to another asus webpage. On that page i searched for B850 and found the following:
AMD Ryzen 8000 sereis desktop processors do not support CPU bifurcation.
What does that mean, i don't understand.
Finally it seems the cheaper non extreme board would for my particular use case offer me one more M.2 slot, there might also be a few more usb slots available on the extreme board but i don't need that or any other additional connector.
Judging from my conclusion it appears purchasing the cheaper board would be the better idea, however i do have a final important question that could make the extreme board version worth paying the extra money.
Is there a difference between asus B850A and B850E in terms of materials, quality and stability and performance?
GPU mounted in PCIEX16(G5) slot running will run x8 instead of x16, if either M.2_2 or M.2_3 slot is operating.
I intend to mount the GPU in the G5 PCIe slot so both the M.2_2 and _3 slots would be non existent because even if the performance difference from x8 and x18 is minor, i would prefer operating the GPU @ x16. So both the M.2 slots would be entirely useless, which i an argument against purchasing the board offering those additional M.2 slots that i wouldn't use anyways.
Additionally the M.2_4 slot will be disabled when i'm operating my soundcard via PCIEX16(G4) slot, so that makes another M.2 slot entirely useless.
However, the M.2_1 and M.2_5 slots would both remain operational while both the PCIEX16(G5) and PCIEX16(G4) are in use, without bandwidth conflict between any of these slots.
Did i get this right or no?
The specificationpage for the asus B850E also says this:
Specifications vary by CPU types.
And what the hell does this mean exactly? I intend to combine the board with the amd 9800X3D processor. So what would be the outcome of that?
The other mainboard i'm considering is the asus B850A. This board shows only very little information about connectors with shared bandwidth.
The usermanual says only this: When PCIEX16(G4) slot is operating, M.2_3 will be disabled.
So in my case where both PCIE G5 and G4 slots would be operating (one gpu + one soundcard) the M.2_3 slot would be disabled, however the other M.2 slots, _1 and _2 and _4 all three of them would remain operational without affecting the bandwidth of neither G4 or G5 PCIE slot.
PS: The specs page for this board also notes that specification vary by CPU types.
And i've got no idea how to find out exactly what that means for my specific cpu.
Did i get this right or no?
My conclusion: the B850E "extreme" offers few more slots compared to B850A but for my usecase (gpu + soundcard) the B850E would only offer me two operational M.2 slots or otherwise i would compromise bandwidth of either G4 or G5 PCIE slots, while the B850A would offer me three rather than two operational M.2 slots without affecting G4 or G5 PCIE bandwidth.
Did i get this right or no?
PS: The specs page under the expansion slots section for both boards shows a link to another asus webpage. On that page i searched for B850 and found the following:
AMD Ryzen 8000 sereis desktop processors do not support CPU bifurcation.
What does that mean, i don't understand.
Finally it seems the cheaper non extreme board would for my particular use case offer me one more M.2 slot, there might also be a few more usb slots available on the extreme board but i don't need that or any other additional connector.
Judging from my conclusion it appears purchasing the cheaper board would be the better idea, however i do have a final important question that could make the extreme board version worth paying the extra money.
Is there a difference between asus B850A and B850E in terms of materials, quality and stability and performance?
Last edited:
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