Bus Speed Chart

According to this, a single port 10 GbE adapter needs (at minimum) to be placed in a server expansion slot that is a PCIe 1.0 x 8 (8 lane bus); a dual port adapter must go in a x16 slot if it is a PCIe 1.0 bus.

Any PCIe 2.0 expansion slot can handle a dual port 10 GbE adapter, since the slowest bus (x8) runs at 4,000 MB/s.

So, if you are providing a 10 GbE solution using older servers, check with the customer (or verify!) that they will have an open server expansion slot that is x8 or x16.

Bus speed requirements

Bus speed requirements are listed below:

·        4 Gb Fibre Channel requires 425 MB/sec

·        8 Gb Fibre Channel requires 850 MB/sec

·        10 GB Fibre Channel requires 1,250 MB/sec

Bus speeds in PCIe servers

PCIeXpress 1.0 x 1 250
PCIeXpress 1.0 x 2 500
PCIeXpress 1.0 x 4 1,000
PCIeXpress 1.0 x 8 2,000
PCIeXpress 1.0 x 16 4, 000
PCIeXpress 1.0 x 32 8,000
PCIeXpress 2.0 x 8 4,000
PCIeXpress 2.0 x 16 8,000
PCIeXpress 2.0 x 32 16,000