- Dec 30, 2020
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Hello,
MSI B550 UNIFY Board has total four M2 slots. 1st is directly coupled with CPU, 2nd and 3rd M2 slots actually share PCI-E 4.0 x 16 bandwidth. If I put SSD in any of these M2 slots, PCI-E slot brought down to x8 mode. This is fine as long as there is 3000/5000 series CPU with graphics card installed in PCI-E x 16 slot.
I just wanted to couple Ryzen 4750G (processor with CPU graphics) with MSI B550 UNIFY and will not using any discrete graphics card. Will this disable two middle M2 slots ? Because there are total 16 lanes available for CPU built-in graphics and i am not sure if built-in VEGA CPU graphics will run with x8 and allows SSDs to run in both M2 slots with x4 and x4 mode coupled to CPU?
Applicable for B550 UNIFY and B550 Arous Master
From MSI board manual:
In CPU mode with AMD RyzenTM 4000-G series processors, if you install the MSI M.2 Xpander series add-in card into PCI_E1 slot, only one M.2 slot of the add-in card is available.
In above PCI_E1 refers to full length PCI-E 4.0 x 16 slot next to CPU
I will not use any M2 card in PCI-E slot but based on above statement from manual, after using CPU with IGPU, I am left with very few lanes with main PCI-E 4.0 x 16 slot. It means somewhere IGPU consumes available PCI lanes.
There are total 16 PCI lanes available for this board connected to CPU (PCI-E 4.0 x 16) as per B550 specifications. After using CPU with IGPU if those lanes brought down to extent that i can use only single M2 slot from add-in card in main PCI-E 4.0 x 16 slot (I am not adding M2 card) , then I don't think it allows me to use onboard M2 slot as they actually shares bandwidth with main PCI-E 4.0 x 16 slot
Any pointers would be highly appreciated
MSI B550 UNIFY Board has total four M2 slots. 1st is directly coupled with CPU, 2nd and 3rd M2 slots actually share PCI-E 4.0 x 16 bandwidth. If I put SSD in any of these M2 slots, PCI-E slot brought down to x8 mode. This is fine as long as there is 3000/5000 series CPU with graphics card installed in PCI-E x 16 slot.
I just wanted to couple Ryzen 4750G (processor with CPU graphics) with MSI B550 UNIFY and will not using any discrete graphics card. Will this disable two middle M2 slots ? Because there are total 16 lanes available for CPU built-in graphics and i am not sure if built-in VEGA CPU graphics will run with x8 and allows SSDs to run in both M2 slots with x4 and x4 mode coupled to CPU?
Applicable for B550 UNIFY and B550 Arous Master
From MSI board manual:
In CPU mode with AMD RyzenTM 4000-G series processors, if you install the MSI M.2 Xpander series add-in card into PCI_E1 slot, only one M.2 slot of the add-in card is available.
In above PCI_E1 refers to full length PCI-E 4.0 x 16 slot next to CPU
I will not use any M2 card in PCI-E slot but based on above statement from manual, after using CPU with IGPU, I am left with very few lanes with main PCI-E 4.0 x 16 slot. It means somewhere IGPU consumes available PCI lanes.
There are total 16 PCI lanes available for this board connected to CPU (PCI-E 4.0 x 16) as per B550 specifications. After using CPU with IGPU if those lanes brought down to extent that i can use only single M2 slot from add-in card in main PCI-E 4.0 x 16 slot (I am not adding M2 card) , then I don't think it allows me to use onboard M2 slot as they actually shares bandwidth with main PCI-E 4.0 x 16 slot
Any pointers would be highly appreciated