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PCIe 2.0 vs PCIe 1.0 in same system

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May 12, 2011 10:21:49 PM

I,m planning to convert my old PC into a NAS.
I was looking at a RAID controller that is PCIe 2.0 8x and a mobo with two PCIe 2.0 slots. If my video card is an older PCIe 1.0 16x would it impact on the controller's performance, i.e. drag it down to its level?

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a b G Storage
May 12, 2011 11:43:57 PM

A curious question! I think the pci-e version used would probably depend on the motherboard.

Several things

1) If this is a NAS it should be low powered. Newer graphics cards are more power efficient. Maybe consider picking up a low end 5K series ATI card. They are inexpensive and are certainly pci-e 2.0. So that solves the issue outright.

2) Whilst some motherboards have 16/8/4/1 size pci-e connectors it certainly does not mean that they are going to be used at the level you expect. For example, many motherboards will make 16x slots run at 8x when two PCI-e 16x devices are used. So check your motherboard manual to see what happens when connecting multiple pci-e devices.

2) Say your old GPU did force the raid controller to run at 1.x. An 8x pci-e 1.x should be able to transfer 2GB/s. My Areca ARC-1880i, a hardware raid card, had a maximum read at something like 2.3GB/s in a benchmark I ran. Just for reference the average read was 176MB/s. So unless your card is going to run at 2GB/s constantly you aren't going to saturate the PCI-e bus even at version 1.x

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a b G Storage
May 13, 2011 12:21:31 AM
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merkhander said:
I,m planning to convert my old PC into a NAS.
I was looking at a RAID controller that is PCIe 2.0 8x and a mobo with two PCIe 2.0 slots. If my video card is an older PCIe 1.0 16x would it impact on the controller's performance, i.e. drag it down to its level?



That should not affect the PCI slot at all...

PCIE is peer to peer connection, so it sees V1 then stay at V1 connection, same thing as V2. There is no dragging on other PCI E slots...
May 23, 2011 1:52:44 AM

Best answer selected by merkhander.
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