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When running RTX card on Pcie 4.0 x8..?

mrdoubtfull
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Does that yield the same bandwidth as 3.0 x16 or is it limited to 3.0 x8? 

 

Curious because of the new B550 Aorus Master. If I use NVMes on all three slots, I believe it puts the GPU in x8 mode but I'm wondering if the card gets the full 4.0 x8 bandwidth or if it's cut down to 3.0 x8? 

 

The cards have to be 4.0 themselves to get the full bandwidth, right?

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Just now, CircleTech said:

The RTX cards are PCIe 3.0. Since you are plugging a PCIe 3.0 device into a PCIe 4.0 x8 slot, your GPU will operate at PCIe 3.0 x8. No, you won't see any impact in gaming performance.

That's what I figured, thanks! 

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Just now, CircleTech said:

The RTX cards are PCIe 3.0. Since you are plugging a PCIe 3.0 device into a PCIe 4.0 x8 slot, your GPU will operate at PCIe 3.0 x8. No, you won't see any impact in gaming performance.

well, you will see a performance drop if you use the 8x rather than the 16x and op nvme drives dont use up the pcie slots gpus and other expansion cards do

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2 minutes ago, Nick Neuburg said:

well, you will see a performance drop if you use the 8x rather than the 16x and op nvme drives dont use up the pcie slots gpus and other expansion cards do

like 2%. unless you running out of video memory.

they can on some boards. you'd have to read that boards specific manual to know

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blue arrows are your 4x slots for m.2 or nvme (not all of them may be nvme) and the red arrow is the 16x slot and it should stay 16x

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The first m.2 connector gets 4 pci-e 4.0 lanes from the cpu.

 

Then you have 16 pci-e lanes which can go to a pci-e x16 slot OR two pci-e x16 slots (but which are electrically x8). They chose to split the 8 lanes that would go to a 2nd slot, to 2 x4 slots.

 

If you install a nvme m.2 ssd in one of the two bottom m.2 connectors, the pci-e x16 becomes pci-e x8 .. and i suspect if you use a rx 2080 that downgrades the pci-e slot to pci-e 3.0 , probably the m.2 connectors also become pci-e 3.0 x4 (max ~3.8 GB/s)

 

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