If a dual port 10G SFP+ Card (PCIe 3.0 card like ConnectX-3, Solarflare SFN7122/8522, etc) has only one port in use, can that active port use all of the PCIe slot's available bandwidth? Said another way, does the card (or drivers, etc.) apportion/reserve bandwidth for the unused port?
I want to add a single 10G SFP+ connection to a motherboard with a PCIe 3.0 slot that's only x2 electrically. Digging through my spare parts box, the single port cards are all PCIe 2.0. So they wouldn't be able to make 10G on 2 lanes (at least by my math). But, I also have some dual port PCIe 3.0 cards, which should be OK on just two PCIe lanes, assuming the active port can grab all the bandwidth?
I tried googling, but its either so obvious that nobody feels the need to write about it, or its something that just doesn't get asked very much.
Maybe because nobody but me tries silly things like this?
I want to add a single 10G SFP+ connection to a motherboard with a PCIe 3.0 slot that's only x2 electrically. Digging through my spare parts box, the single port cards are all PCIe 2.0. So they wouldn't be able to make 10G on 2 lanes (at least by my math). But, I also have some dual port PCIe 3.0 cards, which should be OK on just two PCIe lanes, assuming the active port can grab all the bandwidth?
I tried googling, but its either so obvious that nobody feels the need to write about it, or its something that just doesn't get asked very much.
Maybe because nobody but me tries silly things like this?