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HI, Back again Was comparing CX3 with CX3 pro cards and found out that CX3 cards will work in x4 mode when connected to pcie3 (x8 in gen2), but nothing about this in XC3-Pro En but these lines: --- A lesser width adapter can be seated into a greater width slot (x4 in a x8), but a greater width...

I386, Tnx for respons and link As my calculation says, gen3 is nearly 8gbps per lane per direction, and thats 32 gbps in x4 link in one direction or 64 gbps full duplex, isnt it enough room for 40gbps that a dual sfp+ card needs? Regards, Hessam

Tnx Patrick, I will edit my question, I already meant those cards that are gen 3 capable Regards, Hessam

Hi My very first post here I was about to buy my first 10gb nic, during my researches I found out that there is almost no pcie gen3 dual sfp+ 10gb nic with x4 edge connector, as the bandwith provided by x4 gen 3 is enough for 40gbps full duplex, is there any reason(backward compatibility, etc)...