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Nvme PCIe 4.0 M.2 and Nvme PCIe 3.0 M.2

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Hello Everyone, Hopefully this can be an easy question: So i built my Son a new PC for graduation, MSI X570 Tomahawk with a 3900X , I put in a 1TB Nvme PCIe 4.0 M.2 ssd with Windows 10 and some of his games, So now he went out and bought a 1TB Nvme PCIe 3.0 M.2 ssd for more games. Will running the the PCIe 4.0 ssd and the PCIe 3.0 ssd cause any issues on the same motherboard ??? Mainly will it slow down the performance of the Nvme PCIe4.0 ssd? Any feedback would be appreciated Thank You
 
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i believe everything would work normally, same as multiple pcie cards at different rates, one should not contradict the other, as the chipset and cpu have multiple lanes, you decide how they are spread out.
 
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The top M2 slot should be wired PCIe-4
The lower slot should be PCIe-3
The manual should show you the layout.
 
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No, no issues, the second drive will simply run in PCIe 3.0 mode.
The top-most slot is also connected to the CPU, while the second one is connected to the chipset, so there's no interaction in that sense that would cause problems either.

The top M2 slot should be wired PCIe-4
The lower slot should be PCIe-3
The manual should show you the layout.
Huh? It's X570, not B550...
Nor is it one of the gimped MSI boards.
2x M.2 slots (Key M) 1
  • M2_1 slot (from AMD® Processor)
    • Supports PCIe 4.0 x4 (3rd Gen AMD Ryzen™)
    • Supports PCIe 3.0 x4 (2nd Gen AMD Ryzen™/ Ryzen™ with Radeon™ Vega Graphics and 2nd Gen AMD Ryzen™ with Radeon™ Graphics)
    • Supports 2242/ 2260/ 2280/ 22110 storage devices
  • M2_2 slot (from AMD® X570 Chipset)
    • Supports PCIe 4.0 x4 (3rd Gen AMD Ryzen™)
    • Supports PCIe 3.0 x4 (2nd Gen AMD Ryzen™/ Ryzen™ with Radeon™ Vega Graphics and 2nd Gen AMD Ryzen™ with Radeon™ Graphics)
    • Supports SATA 6Gb/s
    • Supports 2242/ 2260/ 2280 storage devices
 
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Thanks Everyone, Much Appreciated
 

PCMcGee

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The top M2 slot should be wired PCIe-4
The lower slot should be PCIe-3
The manual should show you the layout.
Sorry if I am misinformed but, from what I understand the top m.2 PCIE slot is coming from the processor, and the videocard being PCIE 3.0 will cause the bus to use the lowest setting available for the devices attached. It seems like using the chipset bus for the PCIE 4.0 device would enable the PCIE 4.0 M.2 drive to operate at full PCIE 4.0 speed, where if it was attached to the CPU bus it would throttle back to the GPU's speed of PCIE 3.0. (The chipset bus on the X570 also runs PCIE 4.0)

I am building a system that would have almost identical issues, and this is what I have been led to believe.
 

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